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drm/ast: Fix comment on modeset lock

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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@suse.de>
Fixes: 1fe1821549 ("drm/ast: Acquire I/O-register lock in atomic_commit_tail function")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.2+
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250324094520.192974-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-03-24 10:44:09 +01:00
parent 231adeda9f
commit 7cce65f378
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/ast/ast_mode.c
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@ -939,9 +939,9 @@ static void ast_mode_config_helper_atomic_commit_tail(struct drm_atomic_state *s
/*
* 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);