diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-12-09 22:28:30 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-12-10 19:47:25 +0300 |
| commit | 4252fbc3d4d3abd09ccc7598342cc930d09aac27 (patch) | |
| tree | e7a9a5b14980fde95858b094614268f2c9e04fcf /drivers/gpu/drm/i915/i915_debugfs.c | |
| parent | 2be57922d46fdec4360ced2eb108832c5a90bc0e (diff) | |
| download | linux-4252fbc3d4d3abd09ccc7598342cc930d09aac27.tar.xz | |
drm/i915: Protect pipe_crc->entries update
Set the pipe_crc->entries pointer while holding the relevant spinlock.
Doesn't matter too much since a spurious pipe crc interrupt would then
just update one entry but later that entry would get cleared when head
and tail are both set to 0. But being a bit more paranoid doesn't hurt.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 0779e7f33f42..218e27cb3e2f 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3410,13 +3410,15 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe, /* none -> real source transition */ if (source) { + struct intel_pipe_crc_entry *entries; + DRM_DEBUG_DRIVER("collecting CRCs for pipe %c, %s\n", pipe_name(pipe), pipe_crc_source_name(source)); - pipe_crc->entries = kzalloc(sizeof(*pipe_crc->entries) * - INTEL_PIPE_CRC_ENTRIES_NR, - GFP_KERNEL); - if (!pipe_crc->entries) + entries = kzalloc(sizeof(*pipe_crc->entries) * + INTEL_PIPE_CRC_ENTRIES_NR, + GFP_KERNEL); + if (!entries) return -ENOMEM; /* @@ -3428,6 +3430,7 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe, hsw_disable_ips(crtc); spin_lock_irq(&pipe_crc->lock); + pipe_crc->entries = entries; pipe_crc->head = 0; pipe_crc->tail = 0; spin_unlock_irq(&pipe_crc->lock); |