[PATCHv2 2/2] i915: do not leak module ref counter

2019-08-20 Thread Sergey Senozhatsky
Always put_filesystem() in i915_gemfs_init().

Signed-off-by: Sergey Senozhatsky 
---
 - v2: rebased (i915 does not remount gemfs anymore)

 drivers/gpu/drm/i915/gem/i915_gemfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gemfs.c 
b/drivers/gpu/drm/i915/gem/i915_gemfs.c
index 5e6e8c91ab38..0a398e1e45fc 100644
--- a/drivers/gpu/drm/i915/gem/i915_gemfs.c
+++ b/drivers/gpu/drm/i915/gem/i915_gemfs.c
@@ -30,6 +30,7 @@ int i915_gemfs_init(struct drm_i915_private *i915)
 */
 
gemfs = kern_mount(type);
+   put_filesystem(type);
if (IS_ERR(gemfs))
return PTR_ERR(gemfs);
 
-- 
2.23.0

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Re: [PATCHv2 2/2] i915: do not leak module ref counter

2019-08-19 Thread Christoph Hellwig
On Tue, Aug 20, 2019 at 12:13:59PM +0900, Sergey Senozhatsky wrote:
> Always put_filesystem() in i915_gemfs_init().
> 
> Signed-off-by: Sergey Senozhatsky 
> ---
>  - v2: rebased (i915 does not remount gemfs anymore)

Which means it real doesn't need its mount anyore, and thus can use
plain old shmem_file_setup and doesn't need to mess with file system
types at all.

Assuming we find a legitimate rason for why a driver should be able
to create a kernel mount or a file system type where it doesn't have
access to the struct file_system_type an API that mount by file system
name and thus hides the get_fs_type and put_filesystem would be a much
better API than adding this random export.