diff mbox

[29/50] drm/i915: Use unsigned long for obj->user_pin_count

Message ID 1407203579-24841-30-git-send-email-dheerajx.s.jamwal@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dheeraj Jamwal Aug. 5, 2014, 1:52 a.m. UTC 
From: Daniel Vetter <daniel.vetter@ffwll.ch>

At least on linux sizeof(long) == sizeof(void*) and the thinking
is that you can grab about as many references as there's memory.

Doesn't really matter, just a bit of OCD since the fixed size data
type in a pure in-kernel datastructure look off.

v2: Ville asked for an overflow check since no one prevents userspace
from incrementing the pin count forever.

v3: s/INT/LONG/, noticed by Chris.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit aa5f8021811aede2e40aa715c55fbd87d945a443)

Signed-off-by: Dheeraj Jamwal <dheerajx.s.jamwal@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |    2 +-
 drivers/gpu/drm/i915/i915_gem.c |    5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 558cbe1..1fe6e63 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1604,7 +1604,7 @@  struct drm_i915_gem_object {
 	unsigned long *bit_17;
 
 	/** User space pin count and filp owning the pin */
-	uint32_t user_pin_count;
+	unsigned long user_pin_count;
 	struct drm_file *pin_filp;
 
 	/** for phy allocated objects */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dbf5aef..32784ff 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3925,6 +3925,11 @@  i915_gem_pin_ioctl(struct drm_device *dev, void *data,
 		goto out;
 	}
 
+	if (obj->user_pin_count == ULONG_MAX) {
+		ret = -EBUSY;
+		goto out;
+	}
+
 	if (obj->user_pin_count == 0) {
 		ret = i915_gem_obj_ggtt_pin(obj, args->alignment, true, false);
 		if (ret)