Patch "drm/sysfb: Do not page-align visible size of the framebuffer" has been added to the 7.1-stable tree

Patch "drm/sysfb: Do not page-align visible size of the framebuffer" has been added to the 7.1-stable tree

[gregkh]

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

    drm/sysfb: Do not page-align visible size of the framebuffer

to the 7.1-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-sysfb-do-not-page-align-visible-size-of-the-framebuffer.patch
and it can be found in the queue-7.1 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 134844856c399bfa9462a159dcf860bfdb748055 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Thu, 18 Jun 2026 10:41:57 +0200
Subject: drm/sysfb: Do not page-align visible size of the framebuffer

From: Thomas Zimmermann <tzimmermann@suse.de>

commit 134844856c399bfa9462a159dcf860bfdb748055 upstream.

Only return the actually visible size of the system framebuffer in
drm_sysfb_get_visible_size_si(). Drivers use this size value for
reserving access to framebuffer memory. Increasing the value can
make later attempts to do so fail.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 32ae90c66fb6 ("drm/sysfb: Add efidrm for EFI displays")
Fixes: a84eb6abe2b6 ("drm/sysfb: Add vesadrm for VESA displays")
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.16+
Link: https://patch.msgid.link/20260618084327.46567-2-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c
+++ b/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c
@@ -67,7 +67,7 @@ EXPORT_SYMBOL(drm_sysfb_get_stride_si);
 u64 drm_sysfb_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
 				  unsigned int height, unsigned int stride, u64 size)
 {
-	u64 vsize = PAGE_ALIGN(height * stride);
+	u64 vsize = height * stride;
 
 	return drm_sysfb_get_validated_size0(dev, "visible size", vsize, size);
 }


Patches currently in stable-queue which might be from tzimmermann@suse.de are

queue-7.1/drm-tests-shmem-set-dma-mask-to-64-bit-in-drm_gem_sh.patch
queue-7.1/drm-exynos-fbdev-remove-offset-into-screen_buffer.patch
queue-7.1/drm-sysfb-avoid-possible-truncation-with-calculating-visible-size.patch
queue-7.1/drm-tegra-fbdev-remove-offset-into-framebuffer-memory.patch
queue-7.1/drm-sysfb-do-not-page-align-visible-size-of-the-framebuffer.patch
queue-7.1/drm-sysfb-return-errno-code-from-drm_sysfb_get_visible_size.patch
queue-7.1/drm-sysfb-avoid-truncating-maximum-stride.patch