[PATCH] drm/i915: Modify spinlocks while reading pipe crc

[Mika Kahola]

Let's try to shuffle spinlock acquiring/releasing while reading
out pipe crc. This is a fix for

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100367

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 drivers/gpu/drm/i915/intel_pipe_crc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index 647426c..de1bf5f 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -146,15 +146,13 @@ i915_pipe_crc_read(struct file *filep, char __user *user_buf, size_t count,
 				       entry->crc[1], entry->crc[2],
 				       entry->crc[3], entry->crc[4]);
 
-		spin_unlock_irq(&pipe_crc->lock);
-
-		if (copy_to_user(user_buf, buf, PIPE_CRC_LINE_LEN))
+		if (copy_to_user(user_buf, buf, PIPE_CRC_LINE_LEN)) {
+			spin_unlock_irq(&pipe_crc->lock);
 			return -EFAULT;
+		}
 
 		user_buf += PIPE_CRC_LINE_LEN;
 		n_entries--;
-
-		spin_lock_irq(&pipe_crc->lock);
 	}
 
 	spin_unlock_irq(&pipe_crc->lock);
-- 
2.7.4