diff options
| author | Dhinakaran Pandiyan <dhinakaran.pandiyan@gmail.com> | 2018-06-25 08:47:40 +0300 |
|---|---|---|
| committer | Dhinakaran Pandiyan <dhinakaran.pandiyan@gmail.com> | 2018-06-26 21:44:55 +0300 |
| commit | c12e0643a05d978657877630d4da1ace06ea3720 (patch) | |
| tree | 461efd4f52fe98a6c5c99df846cab9fff52f8181 /drivers/gpu/drm/i915/intel_psr.c | |
| parent | cf5d862db2e301b8e487f42f99c5cf6f5228ddae (diff) | |
| download | linux-c12e0643a05d978657877630d4da1ace06ea3720.tar.xz | |
drm/i915/psr: Fix race in intel_psr_work()
Commit 5422b37c907e ("drm/i915/psr: Kill delays when activating psr
back.") switched from delayed work to the plain variant and while doing so
removed the check for work_busy() before scheduling a PSR activation.
This appears to cause consecutive executions of psr_activate() in this
scenario - after a worker picks up the PSR work item for execution and
before the work function can acquire the PSR mutex, a psr_flush() can
get hold of the mutex and schedule another PSR work. Without a psr_exit()
between the two psr_activate() calls, warning messages get printed.
Further, since we drop the mutex in the midst of psr_work() to wait for
PSR to idle, another work item can also get scheduled. Fix this by
returning if PSR was already active.
Fixes: 5422b37c907e ("drm/i915/psr: Kill delays when activating psr back.")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106948
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180625054741.3919-1-dhinakaran.pandiyan@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_psr.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_psr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c index ccaee4a748f2..276070d597e1 100644 --- a/drivers/gpu/drm/i915/intel_psr.c +++ b/drivers/gpu/drm/i915/intel_psr.c @@ -758,7 +758,7 @@ static void intel_psr_work(struct work_struct *work) * recheck. Since psr_flush first clears this and then reschedules we * won't ever miss a flush when bailing out here. */ - if (dev_priv->psr.busy_frontbuffer_bits) + if (dev_priv->psr.busy_frontbuffer_bits || dev_priv->psr.active) goto unlock; intel_psr_activate(dev_priv->psr.enabled); |