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drm: Use srcu to protect drm_device.unplugged

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Use srcu to protect drm_device.unplugged in a race free manner.
Drivers can use drm_dev_enter()/drm_dev_exit() to protect and mark
sections preventing access to device resources that are not available
after the device is gone.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Tested-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1522222715-11814-1-git-send-email-andr2000@gmail.com
This commit is contained in:
Noralf Trønnes
2018-03-28 10:38:35 +03:00
committed by Oleksandr Andrushchenko
parent 790861cc34
commit bee330f3d6
3 changed files with 68 additions and 10 deletions
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9
include/drm/drm_device.h
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@@ -46,7 +46,14 @@ struct drm_device {
/* currently active master for this device. Protected by master_mutex */
struct drm_master *master;
atomic_t unplugged; /**< Flag whether dev is dead */
/**
* @unplugged:
*
* Flag to tell if the device has been unplugged.
* See drm_dev_enter() and drm_dev_is_unplugged().
*/
bool unplugged;
struct inode *anon_inode; /**< inode for private address-space */
char *unique; /**< unique name of the device */
/*@} */