FAILED: patch "[PATCH] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon" failed to apply to 6.12-stable tree

FAILED: patch "[PATCH] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon" failed to apply to 6.12-stable tree

[gregkh]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x eb76d0f5553575599561010f24c277cc5b31d003
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025120119-edgy-recycled-bcfe@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From eb76d0f5553575599561010f24c277cc5b31d003 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Wed, 5 Nov 2025 17:14:49 +0100
Subject: [PATCH] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon
 setup

Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
access in fbcon_remap_all(). Without holding the console lock the call
races with switching outputs.

VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
function uses struct fb_info.node, which is set by register_framebuffer().
As the fb-helper code currently sets up VGA switcheroo before registering
the framebuffer, the value of node is -1 and therefore not a legal value.
For example, fbcon uses the value within set_con2fb_map() [1] as an index
into an array.

Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
result in VGA switching that does not switch fbcon correctly.

Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
which already holds the console lock. Fbdev calls fbcon_fb_registered()
from within register_framebuffer(). Serializes the helper with VGA
switcheroo's call to fbcon_remap_all().

Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
as parameter, it really only needs the contained fbcon state. Moving the
call to fbcon initialization is therefore cleaner than before. Only amdgpu,
i915, nouveau and radeon support vga_switcheroo. For all other drivers,
this change does nothing.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: <stable@vger.kernel.org> # v2.6.34+
Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 11a5b60cb9ce..0b3ee008523d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -31,9 +31,7 @@
 
 #include <linux/console.h>
 #include <linux/export.h>
-#include <linux/pci.h>
 #include <linux/sysrq.h>
-#include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_drv.h>
@@ -566,11 +564,6 @@ EXPORT_SYMBOL(drm_fb_helper_release_info);
  */
 void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper)
 {
-	struct fb_info *info = fb_helper->info;
-	struct device *dev = info->device;
-
-	if (dev_is_pci(dev))
-		vga_switcheroo_client_fb_set(to_pci_dev(dev), NULL);
 	unregister_framebuffer(fb_helper->info);
 }
 EXPORT_SYMBOL(drm_fb_helper_unregister_info);
@@ -1632,7 +1625,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
 	struct drm_client_dev *client = &fb_helper->client;
 	struct drm_device *dev = fb_helper->dev;
 	struct drm_fb_helper_surface_size sizes;
-	struct fb_info *info;
 	int ret;
 
 	if (drm_WARN_ON(dev, !dev->driver->fbdev_probe))
@@ -1653,12 +1645,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
 
 	strcpy(fb_helper->fb->comm, "[fbcon]");
 
-	info = fb_helper->info;
-
-	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
-	if (dev_is_pci(info->device))
-		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
-
 	return 0;
 }
 
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 9bd3c3814b5c..e7e07eb2142e 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -66,6 +66,7 @@
 #include <linux/string.h>
 #include <linux/kd.h>
 #include <linux/panic.h>
+#include <linux/pci.h>
 #include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
@@ -78,6 +79,7 @@
 #include <linux/interrupt.h>
 #include <linux/crc32.h> /* For counting font checksums */
 #include <linux/uaccess.h>
+#include <linux/vga_switcheroo.h>
 #include <asm/irq.h>
 
 #include "fbcon.h"
@@ -2899,6 +2901,9 @@ void fbcon_fb_unregistered(struct fb_info *info)
 
 	console_lock();
 
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
+
 	fbcon_registered_fb[info->node] = NULL;
 	fbcon_num_registered_fb--;
 
@@ -3032,6 +3037,10 @@ static int do_fb_registered(struct fb_info *info)
 		}
 	}
 
+	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
+
 	return ret;
 }
 

[PATCH 6.12.y] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

[Sasha Levin]

From: Thomas Zimmermann <tzimmermann@suse.de>

[ Upstream commit eb76d0f5553575599561010f24c277cc5b31d003 ]

Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
access in fbcon_remap_all(). Without holding the console lock the call
races with switching outputs.

VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
function uses struct fb_info.node, which is set by register_framebuffer().
As the fb-helper code currently sets up VGA switcheroo before registering
the framebuffer, the value of node is -1 and therefore not a legal value.
For example, fbcon uses the value within set_con2fb_map() [1] as an index
into an array.

Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
result in VGA switching that does not switch fbcon correctly.

Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
which already holds the console lock. Fbdev calls fbcon_fb_registered()
from within register_framebuffer(). Serializes the helper with VGA
switcheroo's call to fbcon_remap_all().

Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
as parameter, it really only needs the contained fbcon state. Moving the
call to fbcon initialization is therefore cleaner than before. Only amdgpu,
i915, nouveau and radeon support vga_switcheroo. For all other drivers,
this change does nothing.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: <stable@vger.kernel.org> # v2.6.34+
Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de
[ adapted dev->dev variable access ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/drm_fb_helper.c  | 6 ------
 drivers/video/fbdev/core/fbcon.c | 9 +++++++++
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b15ddbd65e7b5..a8971c4eb9f05 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -30,9 +30,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/console.h>
-#include <linux/pci.h>
 #include <linux/sysrq.h>
-#include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_drv.h>
@@ -1637,10 +1635,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
 
 	strcpy(fb_helper->fb->comm, "[fbcon]");
 
-	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
-	if (dev_is_pci(dev->dev))
-		vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
-
 	return 0;
 }
 
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 1fc1e47ae2b49..e681066736dea 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -65,6 +65,7 @@
 #include <linux/string.h>
 #include <linux/kd.h>
 #include <linux/panic.h>
+#include <linux/pci.h>
 #include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
@@ -77,6 +78,7 @@
 #include <linux/interrupt.h>
 #include <linux/crc32.h> /* For counting font checksums */
 #include <linux/uaccess.h>
+#include <linux/vga_switcheroo.h>
 #include <asm/irq.h>
 
 #include "fbcon.h"
@@ -2894,6 +2896,9 @@ void fbcon_fb_unregistered(struct fb_info *info)
 
 	console_lock();
 
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
+
 	fbcon_registered_fb[info->node] = NULL;
 	fbcon_num_registered_fb--;
 
@@ -3027,6 +3032,10 @@ static int do_fb_registered(struct fb_info *info)
 		}
 	}
 
+	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
+
 	return ret;
 }
 
-- 
2.51.0

Re: [PATCH 6.12.y] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

[Thomas Zimmermann]

Hi,

thanks for backporting.

You also have to remove the calls to vga_switcheroo_client_fb_set() from 
these files

https://elixir.bootlin.com/linux/v6.12/source/drivers/gpu/drm/i915/display/intel_fbdev.c
https://elixir.bootlin.com/linux/v6.12/source/drivers/gpu/drm/radeon/radeon_fbdev.c

Best regards
Thomas

Am 01.12.25 um 23:10 schrieb Sasha Levin:
> From: Thomas Zimmermann <tzimmermann@suse.de>
>
> [ Upstream commit eb76d0f5553575599561010f24c277cc5b31d003 ]
>
> Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
> access in fbcon_remap_all(). Without holding the console lock the call
> races with switching outputs.
>
> VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
> function uses struct fb_info.node, which is set by register_framebuffer().
> As the fb-helper code currently sets up VGA switcheroo before registering
> the framebuffer, the value of node is -1 and therefore not a legal value.
> For example, fbcon uses the value within set_con2fb_map() [1] as an index
> into an array.
>
> Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
> result in VGA switching that does not switch fbcon correctly.
>
> Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
> which already holds the console lock. Fbdev calls fbcon_fb_registered()
> from within register_framebuffer(). Serializes the helper with VGA
> switcheroo's call to fbcon_remap_all().
>
> Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
> as parameter, it really only needs the contained fbcon state. Moving the
> call to fbcon initialization is therefore cleaner than before. Only amdgpu,
> i915, nouveau and radeon support vga_switcheroo. For all other drivers,
> this change does nothing.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
> Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
> Acked-by: Javier Martinez Canillas <javierm@redhat.com>
> Acked-by: Alex Deucher <alexander.deucher@amd.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: nouveau@lists.freedesktop.org
> Cc: amd-gfx@lists.freedesktop.org
> Cc: linux-fbdev@vger.kernel.org
> Cc: <stable@vger.kernel.org> # v2.6.34+
> Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de
> [ adapted dev->dev variable access ]
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>   drivers/gpu/drm/drm_fb_helper.c  | 6 ------
>   drivers/video/fbdev/core/fbcon.c | 9 +++++++++
>   2 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index b15ddbd65e7b5..a8971c4eb9f05 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -30,9 +30,7 @@
>   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>   
>   #include <linux/console.h>
> -#include <linux/pci.h>
>   #include <linux/sysrq.h>
> -#include <linux/vga_switcheroo.h>
>   
>   #include <drm/drm_atomic.h>
>   #include <drm/drm_drv.h>
> @@ -1637,10 +1635,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
>   
>   	strcpy(fb_helper->fb->comm, "[fbcon]");
>   
> -	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
> -	if (dev_is_pci(dev->dev))
> -		vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
> -
>   	return 0;
>   }
>   
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index 1fc1e47ae2b49..e681066736dea 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -65,6 +65,7 @@
>   #include <linux/string.h>
>   #include <linux/kd.h>
>   #include <linux/panic.h>
> +#include <linux/pci.h>
>   #include <linux/printk.h>
>   #include <linux/slab.h>
>   #include <linux/fb.h>
> @@ -77,6 +78,7 @@
>   #include <linux/interrupt.h>
>   #include <linux/crc32.h> /* For counting font checksums */
>   #include <linux/uaccess.h>
> +#include <linux/vga_switcheroo.h>
>   #include <asm/irq.h>
>   
>   #include "fbcon.h"
> @@ -2894,6 +2896,9 @@ void fbcon_fb_unregistered(struct fb_info *info)
>   
>   	console_lock();
>   
> +	if (info->device && dev_is_pci(info->device))
> +		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
> +
>   	fbcon_registered_fb[info->node] = NULL;
>   	fbcon_num_registered_fb--;
>   
> @@ -3027,6 +3032,10 @@ static int do_fb_registered(struct fb_info *info)
>   		}
>   	}
>   
> +	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
> +	if (info->device && dev_is_pci(info->device))
> +		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
> +
>   	return ret;
>   }
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)

Re: [PATCH 6.12.y] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

[Greg KH]

On Tue, Dec 02, 2025 at 08:40:43AM +0100, Thomas Zimmermann wrote:
> Hi,
> 
> thanks for backporting.
> 
> You also have to remove the calls to vga_switcheroo_client_fb_set() from
> these files
> 
> https://elixir.bootlin.com/linux/v6.12/source/drivers/gpu/drm/i915/display/intel_fbdev.c
> https://elixir.bootlin.com/linux/v6.12/source/drivers/gpu/drm/radeon/radeon_fbdev.c

Can you send a fixed up patch instead?

thanks,

greg k-h

[PATCH 6.12.y] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

[Sasha Levin]

From: Thomas Zimmermann <tzimmermann@suse.de>

[ Upstream commit eb76d0f5553575599561010f24c277cc5b31d003 ]

Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
access in fbcon_remap_all(). Without holding the console lock the call
races with switching outputs.

VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
function uses struct fb_info.node, which is set by register_framebuffer().
As the fb-helper code currently sets up VGA switcheroo before registering
the framebuffer, the value of node is -1 and therefore not a legal value.
For example, fbcon uses the value within set_con2fb_map() [1] as an index
into an array.

Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
result in VGA switching that does not switch fbcon correctly.

Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
which already holds the console lock. Fbdev calls fbcon_fb_registered()
from within register_framebuffer(). Serializes the helper with VGA
switcheroo's call to fbcon_remap_all().

Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
as parameter, it really only needs the contained fbcon state. Moving the
call to fbcon initialization is therefore cleaner than before. Only amdgpu,
i915, nouveau and radeon support vga_switcheroo. For all other drivers,
this change does nothing.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: <stable@vger.kernel.org> # v2.6.34+
Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/drm_fb_helper.c            | 6 ------
 drivers/gpu/drm/i915/display/intel_fbdev.c | 6 ------
 drivers/gpu/drm/radeon/radeon_fbdev.c      | 5 -----
 drivers/video/fbdev/core/fbcon.c           | 9 +++++++++
 4 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b15ddbd65e7b5..a8971c4eb9f05 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -30,9 +30,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/console.h>
-#include <linux/pci.h>
 #include <linux/sysrq.h>
-#include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_drv.h>
@@ -1637,10 +1635,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
 
 	strcpy(fb_helper->fb->comm, "[fbcon]");
 
-	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
-	if (dev_is_pci(dev->dev))
-		vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 49a1ac4f54919..337cc9fc31b19 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -589,11 +589,8 @@ static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 static void intel_fbdev_client_unregister(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-	struct drm_device *dev = fb_helper->dev;
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 
 	if (fb_helper->info) {
-		vga_switcheroo_client_fb_set(pdev, NULL);
 		drm_fb_helper_unregister_info(fb_helper);
 	} else {
 		drm_fb_helper_unprepare(fb_helper);
@@ -620,7 +617,6 @@ static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = client->dev;
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	int ret;
 
 	if (dev->fb_helper)
@@ -634,8 +630,6 @@ static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
 	if (ret)
 		goto err_drm_fb_helper_fini;
 
-	vga_switcheroo_client_fb_set(pdev, fb_helper->info);
-
 	return 0;
 
 err_drm_fb_helper_fini:
diff --git a/drivers/gpu/drm/radeon/radeon_fbdev.c b/drivers/gpu/drm/radeon/radeon_fbdev.c
index fb70de29545c6..a197ba2f2717b 100644
--- a/drivers/gpu/drm/radeon/radeon_fbdev.c
+++ b/drivers/gpu/drm/radeon/radeon_fbdev.c
@@ -300,10 +300,8 @@ static void radeon_fbdev_client_unregister(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = fb_helper->dev;
-	struct radeon_device *rdev = dev->dev_private;
 
 	if (fb_helper->info) {
-		vga_switcheroo_client_fb_set(rdev->pdev, NULL);
 		drm_helper_force_disable_all(dev);
 		drm_fb_helper_unregister_info(fb_helper);
 	} else {
@@ -325,7 +323,6 @@ static int radeon_fbdev_client_hotplug(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = client->dev;
-	struct radeon_device *rdev = dev->dev_private;
 	int ret;
 
 	if (dev->fb_helper)
@@ -342,8 +339,6 @@ static int radeon_fbdev_client_hotplug(struct drm_client_dev *client)
 	if (ret)
 		goto err_drm_fb_helper_fini;
 
-	vga_switcheroo_client_fb_set(rdev->pdev, fb_helper->info);
-
 	return 0;
 
 err_drm_fb_helper_fini:
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 1fc1e47ae2b49..e681066736dea 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -65,6 +65,7 @@
 #include <linux/string.h>
 #include <linux/kd.h>
 #include <linux/panic.h>
+#include <linux/pci.h>
 #include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
@@ -77,6 +78,7 @@
 #include <linux/interrupt.h>
 #include <linux/crc32.h> /* For counting font checksums */
 #include <linux/uaccess.h>
+#include <linux/vga_switcheroo.h>
 #include <asm/irq.h>
 
 #include "fbcon.h"
@@ -2894,6 +2896,9 @@ void fbcon_fb_unregistered(struct fb_info *info)
 
 	console_lock();
 
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
+
 	fbcon_registered_fb[info->node] = NULL;
 	fbcon_num_registered_fb--;
 
@@ -3027,6 +3032,10 @@ static int do_fb_registered(struct fb_info *info)
 		}
 	}
 
+	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
+
 	return ret;
 }
 
-- 
2.51.0

Patch "drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup" has been added to the 6.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-fbcon-vga_switcheroo-avoid-race-condition-in-fbcon-setup.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-198144-greg=kroah.com@vger.kernel.org Tue Dec  2 21:23:22 2025
From: Sasha Levin <sashal@kernel.org>
Date: Tue,  2 Dec 2025 15:23:12 -0500
Subject: drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup
To: stable@vger.kernel.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>, Javier Martinez Canillas <javierm@redhat.com>, Alex Deucher <alexander.deucher@amd.com>, dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Sasha Levin <sashal@kernel.org>
Message-ID: <20251202202312.2505097-1-sashal@kernel.org>

From: Thomas Zimmermann <tzimmermann@suse.de>

[ Upstream commit eb76d0f5553575599561010f24c277cc5b31d003 ]

Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
access in fbcon_remap_all(). Without holding the console lock the call
races with switching outputs.

VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
function uses struct fb_info.node, which is set by register_framebuffer().
As the fb-helper code currently sets up VGA switcheroo before registering
the framebuffer, the value of node is -1 and therefore not a legal value.
For example, fbcon uses the value within set_con2fb_map() [1] as an index
into an array.

Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
result in VGA switching that does not switch fbcon correctly.

Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
which already holds the console lock. Fbdev calls fbcon_fb_registered()
from within register_framebuffer(). Serializes the helper with VGA
switcheroo's call to fbcon_remap_all().

Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
as parameter, it really only needs the contained fbcon state. Moving the
call to fbcon initialization is therefore cleaner than before. Only amdgpu,
i915, nouveau and radeon support vga_switcheroo. For all other drivers,
this change does nothing.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: <stable@vger.kernel.org> # v2.6.34+
Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/drm_fb_helper.c            |    6 ------
 drivers/gpu/drm/i915/display/intel_fbdev.c |    6 ------
 drivers/gpu/drm/radeon/radeon_fbdev.c      |    5 -----
 drivers/video/fbdev/core/fbcon.c           |    9 +++++++++
 4 files changed, 9 insertions(+), 17 deletions(-)

--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -30,9 +30,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/console.h>
-#include <linux/pci.h>
 #include <linux/sysrq.h>
-#include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_drv.h>
@@ -1637,10 +1635,6 @@ static int drm_fb_helper_single_fb_probe
 
 	strcpy(fb_helper->fb->comm, "[fbcon]");
 
-	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
-	if (dev_is_pci(dev->dev))
-		vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
-
 	return 0;
 }
 
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -589,11 +589,8 @@ static int intel_fbdev_restore_mode(stru
 static void intel_fbdev_client_unregister(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-	struct drm_device *dev = fb_helper->dev;
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 
 	if (fb_helper->info) {
-		vga_switcheroo_client_fb_set(pdev, NULL);
 		drm_fb_helper_unregister_info(fb_helper);
 	} else {
 		drm_fb_helper_unprepare(fb_helper);
@@ -620,7 +617,6 @@ static int intel_fbdev_client_hotplug(st
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = client->dev;
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	int ret;
 
 	if (dev->fb_helper)
@@ -634,8 +630,6 @@ static int intel_fbdev_client_hotplug(st
 	if (ret)
 		goto err_drm_fb_helper_fini;
 
-	vga_switcheroo_client_fb_set(pdev, fb_helper->info);
-
 	return 0;
 
 err_drm_fb_helper_fini:
--- a/drivers/gpu/drm/radeon/radeon_fbdev.c
+++ b/drivers/gpu/drm/radeon/radeon_fbdev.c
@@ -300,10 +300,8 @@ static void radeon_fbdev_client_unregist
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = fb_helper->dev;
-	struct radeon_device *rdev = dev->dev_private;
 
 	if (fb_helper->info) {
-		vga_switcheroo_client_fb_set(rdev->pdev, NULL);
 		drm_helper_force_disable_all(dev);
 		drm_fb_helper_unregister_info(fb_helper);
 	} else {
@@ -325,7 +323,6 @@ static int radeon_fbdev_client_hotplug(s
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = client->dev;
-	struct radeon_device *rdev = dev->dev_private;
 	int ret;
 
 	if (dev->fb_helper)
@@ -342,8 +339,6 @@ static int radeon_fbdev_client_hotplug(s
 	if (ret)
 		goto err_drm_fb_helper_fini;
 
-	vga_switcheroo_client_fb_set(rdev->pdev, fb_helper->info);
-
 	return 0;
 
 err_drm_fb_helper_fini:
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -65,6 +65,7 @@
 #include <linux/string.h>
 #include <linux/kd.h>
 #include <linux/panic.h>
+#include <linux/pci.h>
 #include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
@@ -77,6 +78,7 @@
 #include <linux/interrupt.h>
 #include <linux/crc32.h> /* For counting font checksums */
 #include <linux/uaccess.h>
+#include <linux/vga_switcheroo.h>
 #include <asm/irq.h>
 
 #include "fbcon.h"
@@ -2894,6 +2896,9 @@ void fbcon_fb_unregistered(struct fb_inf
 
 	console_lock();
 
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
+
 	fbcon_registered_fb[info->node] = NULL;
 	fbcon_num_registered_fb--;
 
@@ -3027,6 +3032,10 @@ static int do_fb_registered(struct fb_in
 		}
 	}
 
+	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
+	if (info->device && dev_is_pci(info->device))
+		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
+
 	return ret;
 }
 


Patches currently in stable-queue which might be from sashal@kernel.org are

queue-6.12/usb-typec-ucsi-psy-set-max-current-to-zero-when-disconnected.patch
queue-6.12/net-fec-do-not-update-perout-if-it-is-enabled.patch
queue-6.12/spi-nxp-fspi-propagate-fwnode-in-acpi-case-as-well.patch
queue-6.12/spi-amlogic-spifc-a1-handle-devm_pm_runtime_enable-e.patch
queue-6.12/can-gs_usb-gs_usb_receive_bulk_callback-check-actual.patch
queue-6.12/drm-xe-fix-conversion-from-clock-ticks-to-millisecon.patch
queue-6.12/mm-huge_memory-fix-null-pointer-deference-when-splitting-folio.patch
queue-6.12/usb-gadget-udc-fix-use-after-free-in-usb_gadget_state_work.patch
queue-6.12/spi-spi-nxp-fspi-remove-the-goto-in-probe.patch
queue-6.12/net-atlantic-fix-fragment-overflow-handling-in-rx-pa.patch
queue-6.12/bluetooth-btusb-mediatek-fix-kernel-crash-when-relea.patch
queue-6.12/mailbox-mtk-cmdq-refine-dma-address-handling-for-the.patch
queue-6.12/bluetooth-hci_core-fix-triggering-cmd_timer-for-hci_.patch
queue-6.12/platform-x86-intel-punit_ipc-fix-memory-corruption.patch
queue-6.12/veth-reduce-xdp-no_direct-return-section-to-fix-race.patch
queue-6.12/net-sched-generalize-check-for-no-queue-qdisc-on-tx-.patch
queue-6.12/iio-st_lsm6dsx-fixed-calibrated-timestamp-calculatio.patch
queue-6.12/net-lan966x-fix-the-initialization-of-taprio.patch
queue-6.12/net-phy-mxl-gpy-fix-bogus-error-on-usxgmii-and-integ.patch
queue-6.12/can-rcar_canfd-fix-can-fd-mode-as-default.patch
queue-6.12/net-dsa-sja1105-simplify-static-configuration-reload.patch
queue-6.12/veth-apply-qdisc-backpressure-on-full-ptr_ring-to-re.patch
queue-6.12/bluetooth-hci_sock-prevent-race-in-socket-write-iter.patch
queue-6.12/net-fec-do-not-allow-enabling-pps-and-perout-simulta.patch
queue-6.12/net-sxgbe-fix-potential-null-dereference-in-sxgbe_rx.patch
queue-6.12/net-dsa-microchip-do-not-execute-ptp-driver-code-for-unsupported-switches.patch
queue-6.12/spi-spi-mem-add-a-new-controller-capability.patch
queue-6.12/net-dsa-sja1105-fix-sgmii-linking-at-10m-or-100m-but.patch
queue-6.12/fs-namespace-fix-reference-leak-in-grab_requested_mn.patch
queue-6.12/usb-gadget-renesas_usbf-handle-devm_pm_runtime_enabl.patch
queue-6.12/veth-prevent-null-pointer-dereference-in-veth_xdp_rc.patch
queue-6.12/drm-amdgpu-fix-cyan_skillfish2-gpu-info-fw-handling.patch
queue-6.12/mailbox-pcc-refactor-error-handling-in-irq-handler-i.patch
queue-6.12/net-fec-cancel-perout_timer-when-perout-is-disabled.patch
queue-6.12/net-mlx5e-fix-validation-logic-in-rate-limiting.patch
queue-6.12/eth-fbnic-fix-counter-roll-over-issue.patch
queue-6.12/net-fec-do-not-register-pps-event-for-perout.patch
queue-6.12/spi-spi-mem-allow-specifying-the-byte-order-in-octal.patch
queue-6.12/net-wwan-mhi-keep-modem-name-match-with-foxconn-t99w.patch
queue-6.12/can-kvaser_usb-leaf-fix-potential-infinite-loop-in-c.patch
queue-6.12/mailbox-mailbox-test-fix-debugfs_create_dir-error-ch.patch
queue-6.12/veth-more-robust-handing-of-race-to-avoid-txq-gettin.patch
queue-6.12/usb-udc-add-trace-event-for-usb_gadget_set_state.patch
queue-6.12/spi-spi-mem-extend-spi-mem-operations-with-a-per-ope.patch
queue-6.12/net-dsa-microchip-free-previously-initialized-ports-on-init-failures.patch
queue-6.12/drm-fbcon-vga_switcheroo-avoid-race-condition-in-fbcon-setup.patch
queue-6.12/spi-bcm63xx-fix-premature-cs-deassertion-on-rx-only-.patch
queue-6.12/spi-nxp-fspi-support-per-spi-mem-operation-frequency.patch
queue-6.12/spi-spi-nxp-fspi-add-oct-dtr-mode-support.patch
queue-6.12/net-dsa-microchip-fix-symetry-in-ksz_ptp_msg_irq_-setup-free.patch
queue-6.12/spi-tegra114-remove-kconfig-dependency-on-tegra20_ap.patch
queue-6.12/can-gs_usb-gs_usb_xmit_callback-fix-handling-of-fail.patch
queue-6.12/team-move-team-device-type-change-at-the-end-of-team.patch
queue-6.12/net-aquantia-add-missing-descriptor-cache-invalidati.patch
queue-6.12/bluetooth-smp-fix-not-generating-mackey-and-ltk-when.patch
queue-6.12/mailbox-pcc-don-t-zero-error-register.patch
queue-6.12/can-gs_usb-gs_usb_receive_bulk_callback-check-actual.patch-29525

Re: [PATCH 6.12.y] drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup

[Thomas Zimmermann]

Hi,

thank you for providing an updated patch.

Am 02.12.25 um 21:23 schrieb Sasha Levin:
> From: Thomas Zimmermann <tzimmermann@suse.de>
>
> [ Upstream commit eb76d0f5553575599561010f24c277cc5b31d003 ]
>
> Protect vga_switcheroo_client_fb_set() with console lock. Avoids OOB
> access in fbcon_remap_all(). Without holding the console lock the call
> races with switching outputs.
>
> VGA switcheroo calls fbcon_remap_all() when switching clients. The fbcon
> function uses struct fb_info.node, which is set by register_framebuffer().
> As the fb-helper code currently sets up VGA switcheroo before registering
> the framebuffer, the value of node is -1 and therefore not a legal value.
> For example, fbcon uses the value within set_con2fb_map() [1] as an index
> into an array.
>
> Moving vga_switcheroo_client_fb_set() after register_framebuffer() can
> result in VGA switching that does not switch fbcon correctly.
>
> Therefore move vga_switcheroo_client_fb_set() under fbcon_fb_registered(),
> which already holds the console lock. Fbdev calls fbcon_fb_registered()
> from within register_framebuffer(). Serializes the helper with VGA
> switcheroo's call to fbcon_remap_all().
>
> Although vga_switcheroo_client_fb_set() takes an instance of struct fb_info
> as parameter, it really only needs the contained fbcon state. Moving the
> call to fbcon initialization is therefore cleaner than before. Only amdgpu,
> i915, nouveau and radeon support vga_switcheroo. For all other drivers,
> this change does nothing.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Link: https://elixir.bootlin.com/linux/v6.17/source/drivers/video/fbdev/core/fbcon.c#L2942 # [1]
> Fixes: 6a9ee8af344e ("vga_switcheroo: initial implementation (v15)")
> Acked-by: Javier Martinez Canillas <javierm@redhat.com>
> Acked-by: Alex Deucher <alexander.deucher@amd.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: nouveau@lists.freedesktop.org
> Cc: amd-gfx@lists.freedesktop.org
> Cc: linux-fbdev@vger.kernel.org
> Cc: <stable@vger.kernel.org> # v2.6.34+
> Link: https://patch.msgid.link/20251105161549.98836-1-tzimmermann@suse.de
> Signed-off-by: Sasha Levin <sashal@kernel.org>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/drm_fb_helper.c            | 6 ------
>   drivers/gpu/drm/i915/display/intel_fbdev.c | 6 ------
>   drivers/gpu/drm/radeon/radeon_fbdev.c      | 5 -----
>   drivers/video/fbdev/core/fbcon.c           | 9 +++++++++
>   4 files changed, 9 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index b15ddbd65e7b5..a8971c4eb9f05 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -30,9 +30,7 @@
>   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>   
>   #include <linux/console.h>
> -#include <linux/pci.h>
>   #include <linux/sysrq.h>
> -#include <linux/vga_switcheroo.h>
>   
>   #include <drm/drm_atomic.h>
>   #include <drm/drm_drv.h>
> @@ -1637,10 +1635,6 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
>   
>   	strcpy(fb_helper->fb->comm, "[fbcon]");
>   
> -	/* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */
> -	if (dev_is_pci(dev->dev))
> -		vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info);
> -
>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 49a1ac4f54919..337cc9fc31b19 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -589,11 +589,8 @@ static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
>   static void intel_fbdev_client_unregister(struct drm_client_dev *client)
>   {
>   	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
> -	struct drm_device *dev = fb_helper->dev;
> -	struct pci_dev *pdev = to_pci_dev(dev->dev);
>   
>   	if (fb_helper->info) {
> -		vga_switcheroo_client_fb_set(pdev, NULL);
>   		drm_fb_helper_unregister_info(fb_helper);
>   	} else {
>   		drm_fb_helper_unprepare(fb_helper);
> @@ -620,7 +617,6 @@ static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
>   {
>   	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
>   	struct drm_device *dev = client->dev;
> -	struct pci_dev *pdev = to_pci_dev(dev->dev);
>   	int ret;
>   
>   	if (dev->fb_helper)
> @@ -634,8 +630,6 @@ static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
>   	if (ret)
>   		goto err_drm_fb_helper_fini;
>   
> -	vga_switcheroo_client_fb_set(pdev, fb_helper->info);
> -
>   	return 0;
>   
>   err_drm_fb_helper_fini:
> diff --git a/drivers/gpu/drm/radeon/radeon_fbdev.c b/drivers/gpu/drm/radeon/radeon_fbdev.c
> index fb70de29545c6..a197ba2f2717b 100644
> --- a/drivers/gpu/drm/radeon/radeon_fbdev.c
> +++ b/drivers/gpu/drm/radeon/radeon_fbdev.c
> @@ -300,10 +300,8 @@ static void radeon_fbdev_client_unregister(struct drm_client_dev *client)
>   {
>   	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
>   	struct drm_device *dev = fb_helper->dev;
> -	struct radeon_device *rdev = dev->dev_private;
>   
>   	if (fb_helper->info) {
> -		vga_switcheroo_client_fb_set(rdev->pdev, NULL);
>   		drm_helper_force_disable_all(dev);
>   		drm_fb_helper_unregister_info(fb_helper);
>   	} else {
> @@ -325,7 +323,6 @@ static int radeon_fbdev_client_hotplug(struct drm_client_dev *client)
>   {
>   	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
>   	struct drm_device *dev = client->dev;
> -	struct radeon_device *rdev = dev->dev_private;
>   	int ret;
>   
>   	if (dev->fb_helper)
> @@ -342,8 +339,6 @@ static int radeon_fbdev_client_hotplug(struct drm_client_dev *client)
>   	if (ret)
>   		goto err_drm_fb_helper_fini;
>   
> -	vga_switcheroo_client_fb_set(rdev->pdev, fb_helper->info);
> -
>   	return 0;
>   
>   err_drm_fb_helper_fini:
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index 1fc1e47ae2b49..e681066736dea 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -65,6 +65,7 @@
>   #include <linux/string.h>
>   #include <linux/kd.h>
>   #include <linux/panic.h>
> +#include <linux/pci.h>
>   #include <linux/printk.h>
>   #include <linux/slab.h>
>   #include <linux/fb.h>
> @@ -77,6 +78,7 @@
>   #include <linux/interrupt.h>
>   #include <linux/crc32.h> /* For counting font checksums */
>   #include <linux/uaccess.h>
> +#include <linux/vga_switcheroo.h>
>   #include <asm/irq.h>
>   
>   #include "fbcon.h"
> @@ -2894,6 +2896,9 @@ void fbcon_fb_unregistered(struct fb_info *info)
>   
>   	console_lock();
>   
> +	if (info->device && dev_is_pci(info->device))
> +		vga_switcheroo_client_fb_set(to_pci_dev(info->device), NULL);
> +
>   	fbcon_registered_fb[info->node] = NULL;
>   	fbcon_num_registered_fb--;
>   
> @@ -3027,6 +3032,10 @@ static int do_fb_registered(struct fb_info *info)
>   		}
>   	}
>   
> +	/* Set the fb info for vga_switcheroo clients. Does nothing otherwise. */
> +	if (info->device && dev_is_pci(info->device))
> +		vga_switcheroo_client_fb_set(to_pci_dev(info->device), info);
> +
>   	return ret;
>   }
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)