drm/ast: Protect concurrent access to I/O registers with lock

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Add a mutex lock to protect concurrent access to I/O registers
against each other. This happens between invocation of commit-
tail functions and get-mode operations. Both with use the CRTC
index register AST_IO_CRTC_PORT. Concurrent access can lead to
failed mode-setting operations.

v2:
	* fix typo in commit description (Jocelyn)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reported-by: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220502142514.2174-3-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2022-05-02 16:25:13 +02:00

parent e13f13e039

commit f870231fdd

3 changed files with 50 additions and 3 deletions

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1

drivers/gpu/drm/ast/ast_drv.h

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4

drivers/gpu/drm/ast/ast_main.c

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48

drivers/gpu/drm/ast/ast_mode.c

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