diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-05-02 17:25:13 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-05-05 10:18:32 +0300 |
| commit | f870231fdd6ce2c6c040a3584a2eac97ae473780 (patch) | |
| tree | b84e31c9b73da87b6e8376913fae8ffb08d55b57 /drivers/gpu/drm/ast/ast_drv.h | |
| parent | e13f13e039dc8f31168b5569120a7658035c80ee (diff) | |
| download | linux-f870231fdd6ce2c6c040a3584a2eac97ae473780.tar.xz | |
drm/ast: Protect concurrent access to I/O registers with lock
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
Diffstat (limited to 'drivers/gpu/drm/ast/ast_drv.h')
| -rw-r--r-- | drivers/gpu/drm/ast/ast_drv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index ff1ae314bd0d..afebe35f205e 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -159,6 +159,7 @@ to_ast_sil164_connector(struct drm_connector *connector) struct ast_private { struct drm_device base; + struct mutex ioregs_lock; /* Protects access to I/O registers in ioregs */ void __iomem *regs; void __iomem *ioregs; void __iomem *dp501_fw_buf; |