linux-kernel - Re: compositing broken in -next (idr bug)

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Date:	Tue, 12 Feb 2013 23:08:41 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: compositing broken in -next (idr bug)

On 02/12/2013 11:03 PM, Jiri Slaby wrote:
> On 02/12/2013 10:55 PM, Jiri Slaby wrote:
>> --- a/drivers/gpu/drm/drm_gem.c
>> +++ b/drivers/gpu/drm/drm_gem.c
>> @@ -453,7 +453,8 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,
>>         spin_lock(&dev->object_name_lock);
>>         if (!obj->name) {
>>                 ret = idr_alloc(&dev->object_name_idr, obj, 1, 0,
>> GFP_NOWAIT);
>> -               obj->name = ret;
>> +               if (ret >= 0)
>> +                       obj->name = ret;
>>                 args->name = (uint64_t) obj->name;
>>                 spin_unlock(&dev->object_name_lock);
>>
>> @@ -469,6 +470,7 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,
>>         }
>>
>>  err:
>> +       idr_preload_end();
>>         drm_gem_object_unreference_unlocked(obj);
>>         return ret;
> 
> Oh my, maybe: return ret < 0 ? ret : 0... Let's try.

Bull's eye.

--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -459,6 +459,7 @@ drm_gem_flink_ioctl(struct drm_device *dev, void *data,

                if (ret < 0)
                        goto err;
+               ret = 0;

                /* Allocate a reference for the name table.  */
                drm_gem_object_reference(obj);

-- 
js
suse labs
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