From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Wed, 15 Feb 2012 13:02:52 +0000 (+0200)
Subject: gfx: drv: Warn if mode_config.mutex is not locked in GTT code
X-Git-Tag: 2.1b_release~280
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c7089ecf3227064183404d2941af20d5981d5635;p=kernel%2Fkernel-mfld-blackbay.git

gfx: drv: Warn if mode_config.mutex is not locked in GTT code

The GTT ref counting relies on mode_config.mutex for protection. Print a
warning if the code is called without holding the mutex.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---

diff --git a/drivers/staging/mrst/drv/psb_gtt.c b/drivers/staging/mrst/drv/psb_gtt.c
index 9610f7a..2025c9e 100644
--- a/drivers/staging/mrst/drv/psb_gtt.c
+++ b/drivers/staging/mrst/drv/psb_gtt.c
@@ -897,6 +897,8 @@ int psb_gtt_map_meminfo(struct drm_device *dev,
 {
 	struct psb_gtt_mem_mapping *mapping;
 
+	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+
 	/* check if memory is already mapped */
 	mapping = psb_gtt_find_mapping_for_key(dev, psb_get_tgid(),
 					       (u32) psKernelMemInfo);
@@ -940,6 +942,8 @@ int psb_gtt_unmap_meminfo(struct drm_device *dev,
 {
 	struct psb_gtt_mem_mapping *mapping;
 
+	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+
 	mapping = psb_gtt_find_mapping_for_key(dev, tgid,
 					       (u32) psKernelMemInfo);
 	if (IS_ERR(mapping)) {