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gpu: nvgpu: hold ch ref when getting ch from fd

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Fix a race condition in gk20a_get_channel_from_file() that returns a
channel pointer from an fd: take a reference to the channel before
putting the file ref back. Now the caller is responsible of releasing
the channel reference eventually.

Also document why dbg_session_channel_data has to hold a ref to the
channel file instead of just the channel: that might deadlock if the fds
were closed in "wrong" order.

Change-Id: I8e91b809f5f7b1cb0c1487bd955ad6d643727a53
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1549290
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Holtta
2017-08-31 13:01:26 +03:00
committed by mobile promotions
parent de0ce3e017
commit 17451138cf
6 changed files with 58 additions and 16 deletions
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11
drivers/gpu/nvgpu/common/linux/ioctl_as.c
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@@ -42,14 +42,19 @@ static int gk20a_as_ioctl_bind_channel(
gk20a_dbg_fn("");
ch = gk20a_get_channel_from_file(args->channel_fd);
if (!ch || gk20a_channel_as_bound(ch))
if (!ch)
return -EINVAL;
if (gk20a_channel_as_bound(ch)) {
err = -EINVAL;
goto out;
}
/* this will set channel_gk20a->vm */
err = ch->g->ops.mm.vm_bind_channel(as_share, ch);
if (err)
return err;
out:
gk20a_channel_put(ch);
return err;
}