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gpu: nvgpu: fix crash in gk20a_channel_release

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gk20a_channel_release() should bail if filp->private_data is
NULL. This can happen as a result of gk20a_channel_release()
being called when __gk20a_channel_open() fails in
NVHOST_IOCTL_CHANNEL_OPEN.

Bug 200014898

Change-Id: I32cc957aca46fcd4265a8052ac5be355b644b9f7
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/496138
Reviewed-by: Ken Adams <kadams@nvidia.com>
Tested-by: Ken Adams <kadams@nvidia.com>
This commit is contained in:
Aingara Paramakuru
2014-09-05 11:38:21 -07:00
committed by Dan Willemsen
parent 926cd4a260
commit ffd25f3905
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/nvgpu/gk20a/channel_gk20a.c
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@@ -708,9 +708,12 @@ unbind:
int gk20a_channel_release(struct inode *inode, struct file *filp) int gk20a_channel_release(struct inode *inode, struct file *filp)
{ {
struct channel_gk20a *ch = (struct channel_gk20a *)filp->private_data; struct channel_gk20a *ch = (struct channel_gk20a *)filp->private_data;
struct gk20a *g = ch->g; struct gk20a *g = ch ? ch->g : NULL;
int err; int err;
if (!ch)
return 0;
trace_gk20a_channel_release(dev_name(&g->dev->dev)); trace_gk20a_channel_release(dev_name(&g->dev->dev));
err = gk20a_busy(ch->g->dev); err = gk20a_busy(ch->g->dev);