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| author | Rob Clark <rob@ti.com> | 2011-12-16 11:34:34 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-16 10:59:25 -0800 |
| commit | af69592aa098ff8cd640e8109ba946db3c1cdb4e (patch) | |
| tree | cdabc9ba67eba37319e7026a4626bb3e962a9d51 /drivers/staging/omapdrm | |
| parent | 510d4d32f25f49dedd7da88c29fdb4d0aada5815 (diff) | |
| download | linux-af69592aa098ff8cd640e8109ba946db3c1cdb4e.tar.gz linux-af69592aa098ff8cd640e8109ba946db3c1cdb4e.tar.bz2 linux-af69592aa098ff8cd640e8109ba946db3c1cdb4e.zip | |
staging: drm/omap: avoid aquiring mutex in atomic context (v2)
omap_gem_roll() could be called by fbcon in atomic context or when
struct_mutext is held. Avoid aquiring mutex (deadlock), or calling
tiler_pin() (which itself is not safe for atomic context) in these
cases.
Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/omapdrm')
| -rw-r--r-- | drivers/staging/omapdrm/omap_gem.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/staging/omapdrm/omap_gem.c b/drivers/staging/omapdrm/omap_gem.c index 96848913085f..63490f75350a 100644 --- a/drivers/staging/omapdrm/omap_gem.c +++ b/drivers/staging/omapdrm/omap_gem.c @@ -538,10 +538,22 @@ int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll) return -EINVAL; } - mutex_lock(&obj->dev->struct_mutex); - omap_obj->roll = roll; + if (in_atomic() || mutex_is_locked(&obj->dev->struct_mutex)) { + /* this can get called from fbcon in atomic context.. so + * just ignore it and wait for next time called from + * interruptible context to update the PAT.. the result + * may be that user sees wrap-around instead of scrolling + * momentarily on the screen. If we wanted to be fancier + * we could perhaps schedule some workqueue work at this + * point. + */ + return 0; + } + + mutex_lock(&obj->dev->struct_mutex); + /* if we aren't mapped yet, we don't need to do anything */ if (omap_obj->block) { struct page **pages; |