drm/i915: Drop mutex around clearing error state

The error state itself is guarded by a spinlock (admittedly even that is
overkill for a single pointer!) and doesn't require us to take the
struct_mutex in the debugfs/sysfs interface. Removing the struct_mutex
removes one more potential blockage when trying to debug a deadlock.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20160901205510.31307-1-chris@chris-wilson.co.uk
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 25af80e..c224702 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -978,17 +978,9 @@ i915_error_state_write(struct file *filp,
                       loff_t *ppos)
 {
        struct i915_error_state_file_priv *error_priv = filp->private_data;
-       struct drm_device *dev = error_priv->dev;
-       int ret;
 
        DRM_DEBUG_DRIVER("Resetting error state\n");
-
-       ret = mutex_lock_interruptible(&dev->struct_mutex);
-       if (ret)
-               return ret;
-
-       i915_destroy_error_state(dev);
-       mutex_unlock(&dev->struct_mutex);
+       i915_destroy_error_state(error_priv->dev);
 
        return cnt;
 }

diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 2d482f6..1012eee 100644 (file)
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -556,17 +556,9 @@ static ssize_t error_state_write(struct file *file, struct kobject *kobj,
 {
        struct device *kdev = kobj_to_dev(kobj);
        struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
-       struct drm_device *dev = &dev_priv->drm;
-       int ret;
 
        DRM_DEBUG_DRIVER("Resetting error state\n");
-
-       ret = mutex_lock_interruptible(&dev->struct_mutex);
-       if (ret)
-               return ret;
-
-       i915_destroy_error_state(dev);
-       mutex_unlock(&dev->struct_mutex);
+       i915_destroy_error_state(&dev_priv->drm);
 
        return count;
 }