From 662d19e78b2c0a955879f487755e6a70a5e0226a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 1 Sep 2016 21:55:10 +0100 Subject: [PATCH] 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 Link: http://patchwork.freedesktop.org/patch/msgid/20160901205510.31307-1-chris@chris-wilson.co.uk Reviewed-by: David Weinehall 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 2d482f677f56..1012eeea1324 100644 --- 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; } -- 2.30.2