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author | Noralf Trønnes <noralf@tronnes.org> | 2019-02-08 15:01:02 +0100 |
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committer | Noralf Trønnes <noralf@tronnes.org> | 2019-02-21 12:11:32 +0100 |
commit | 1ee57d4d75fbc74bb2ae601c8f334219165ef276 (patch) | |
tree | c1147055afbfad120a467bd7210108743d0fd9ad /drivers/gpu/drm/drm_file.c | |
parent | 1fdafbd023793e754aa6ca73c877a375e83b8239 (diff) | |
download | linux-1ee57d4d75fbc74bb2ae601c8f334219165ef276.tar.gz linux-1ee57d4d75fbc74bb2ae601c8f334219165ef276.tar.bz2 linux-1ee57d4d75fbc74bb2ae601c8f334219165ef276.zip |
drm: Fix drm_release() and device unplug
If userspace has open fd(s) when drm_dev_unplug() is run, it will result
in drm_dev_unregister() being called twice. First in drm_dev_unplug() and
then later in drm_release() through the call to drm_put_dev().
Since userspace already holds a ref on drm_device through the drm_minor,
it's not necessary to add extra ref counting based on no open file
handles. Instead just drm_dev_put() unconditionally in drm_dev_unplug().
We now have this:
- Userpace holds a ref on drm_device as long as there's open fd(s)
- The driver holds a ref on drm_device as long as it's bound to the
struct device
When both sides are done with drm_device, it is released.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20190208140103.28919-2-noralf@tronnes.org
Diffstat (limited to 'drivers/gpu/drm/drm_file.c')
-rw-r--r-- | drivers/gpu/drm/drm_file.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c index b1838a41ad43..ee4df8f8a62d 100644 --- a/drivers/gpu/drm/drm_file.c +++ b/drivers/gpu/drm/drm_file.c @@ -479,11 +479,9 @@ int drm_release(struct inode *inode, struct file *filp) drm_file_free(file_priv); - if (!--dev->open_count) { + if (!--dev->open_count) drm_lastclose(dev); - if (drm_dev_is_unplugged(dev)) - drm_put_dev(dev); - } + mutex_unlock(&drm_global_mutex); drm_minor_release(minor); |