Patch "drm/nouveau: check for supported chipset before booting fbdev off the hw" has been added to the 4.4-stable tree

Patch "drm/nouveau: check for supported chipset before booting fbdev off the hw" has been added to the 4.4-stable tree

[gregkh]

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

    drm/nouveau: check for supported chipset before booting fbdev off the hw

to the 4.4-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-nouveau-check-for-supported-chipset-before-booting-fbdev-off-the-hw.patch
and it can be found in the queue-4.4 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 0e67bed2c765ff0fdaec62c963881f5416fe3692 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 12 Jul 2016 11:57:07 +1000
Subject: drm/nouveau: check for supported chipset before booting fbdev off the hw

From: Ben Skeggs <bskeggs@redhat.com>

commit 0e67bed2c765ff0fdaec62c963881f5416fe3692 upstream.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_drm.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -308,7 +308,16 @@ static int nouveau_drm_probe(struct pci_
 	bool boot = false;
 	int ret;
 
-	/* remove conflicting drivers (vesafb, efifb etc) */
+	/* We need to check that the chipset is supported before booting
+	 * fbdev off the hardware, as there's no way to put it back.
+	 */
+	ret = nvkm_device_pci_new(pdev, NULL, "error", true, false, 0, &device);
+	if (ret)
+		return ret;
+
+	nvkm_device_del(&device);
+
+	/* Remove conflicting drivers (vesafb, efifb etc). */
 	aper = alloc_apertures(3);
 	if (!aper)
 		return -ENOMEM;


Patches currently in stable-queue which might be from bskeggs@redhat.com are

queue-4.4/drm-nouveau-gr-nv3x-fix-instobj-write-offsets-in-gr-setup.patch
queue-4.4/drm-nouveau-fbcon-fix-font-width-not-divisible-by-8.patch
queue-4.4/drm-nouveau-check-for-supported-chipset-before-booting-fbdev-off-the-hw.patch