Patch "drm/ast: Fix comment on modeset lock" has been added to the 6.15-stable tree

[gregkh at linuxfoundation.org]

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

    drm/ast: Fix comment on modeset lock

to the 6.15-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-ast-fix-comment-on-modeset-lock.patch
and it can be found in the queue-6.15 subdirectory.

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


>From 7cce65f3789e04c0f7668a66563e680d81d54493 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann at suse.de>
Date: Mon, 24 Mar 2025 10:44:09 +0100
Subject: drm/ast: Fix comment on modeset lock

From: Thomas Zimmermann <tzimmermann at suse.de>

commit 7cce65f3789e04c0f7668a66563e680d81d54493 upstream.

The ast driver protects the commit tail against concurrent reads
of the display modes by acquiring a lock. The comment is misleading
as the lock is not released in atomic_flush, but at the end of the
commit-tail helper. Rewrite the comment.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
Fixes: 1fe182154984 ("drm/ast: Acquire I/O-register lock in atomic_commit_tail function")
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Jocelyn Falempe <jfalempe at redhat.com>
Cc: Dave Airlie <airlied at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v6.2+
Reviewed-by: Jocelyn Falempe <jfalempe at redhat.com>
Link: https://lore.kernel.org/r/20250324094520.192974-2-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/ast/ast_mode.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -922,9 +922,9 @@ static void ast_mode_config_helper_atomi
 
 	/*
 	 * Concurrent operations could possibly trigger a call to
-	 * drm_connector_helper_funcs.get_modes by trying to read the
-	 * display modes. Protect access to I/O registers by acquiring
-	 * the I/O-register lock. Released in atomic_flush().
+	 * drm_connector_helper_funcs.get_modes by reading the display
+	 * modes. Protect access to registers by acquiring the modeset
+	 * lock.
 	 */
 	mutex_lock(&ast->modeset_lock);
 	drm_atomic_helper_commit_tail(state);


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

queue-6.15/drm-cirrus-qemu-fix-pitch-programming.patch
queue-6.15/drm-simpledrm-do-not-upcast-in-release-helpers.patch
queue-6.15/drm-ast-fix-comment-on-modeset-lock.patch
queue-6.15/drm-udl-unregister-device-before-cleaning-up-on-disconnect.patch