Searched hist:c5c354a3a4728045e1342166394c615d75d45377 (Results 1 – 2 of 2) sorted by relevance
| /openbmc/linux/drivers/gpu/drm/udl/ |
| H A D | udl_main.c | diff c5c354a3a4728045e1342166394c615d75d45377 Thu Sep 08 04:51:13 CDT 2022 Takashi Iwai <tiwai@suse.de> drm/udl: Fix inconsistent urbs.count value during udl_free_urb_list()
In the current design, udl_get_urb() may be called asynchronously
during the driver freeing its URL list via udl_free_urb_list().
The problem is that the sync is determined by comparing the urbs.count
and urbs.available fields, while we clear urbs.count field only once
after udl_free_urb_list() finishes, i.e. during udl_free_urb_list(),
the state becomes inconsistent.
For fixing this inconsistency and also for hardening the locking
scheme, this patch does a slight refactoring of the code around
udl_get_urb() and udl_free_urb_list(). Now urbs.count is updated in
the same spinlock at extracting a URB from the list in
udl_free_url_list().
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908095115.23396-11-tiwai@suse.de
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| H A D | udl_drv.h | diff c5c354a3a4728045e1342166394c615d75d45377 Thu Sep 08 04:51:13 CDT 2022 Takashi Iwai <tiwai@suse.de> drm/udl: Fix inconsistent urbs.count value during udl_free_urb_list()
In the current design, udl_get_urb() may be called asynchronously
during the driver freeing its URL list via udl_free_urb_list().
The problem is that the sync is determined by comparing the urbs.count
and urbs.available fields, while we clear urbs.count field only once
after udl_free_urb_list() finishes, i.e. during udl_free_urb_list(),
the state becomes inconsistent.
For fixing this inconsistency and also for hardening the locking
scheme, this patch does a slight refactoring of the code around
udl_get_urb() and udl_free_urb_list(). Now urbs.count is updated in
the same spinlock at extracting a URB from the list in
udl_free_url_list().
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908095115.23396-11-tiwai@suse.de
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