Patch "[media] v4l: rcar-fcp: Don't force users to check for disabled FCP support" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

[media] v4l: rcar-fcp: Don't force users to check for disabled FCP support

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
v4l-rcar-fcp-don-t-force-users-to-check-for-disabled-fcp-support.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Laurent Pinchart <[email protected]>
Date: Wed, 17 Aug 2016 09:57:37 -0300
Subject: [media] v4l: rcar-fcp: Don't force users to check for disabled FCP support

From: Laurent Pinchart <[email protected]>

commit fd44aa9a254b18176ec3792a18e7de6977030ca8 upstream.

The rcar_fcp_enable() function immediately returns successfully when the FCP device pointer is NULL to avoid forcing the users to check the FCP device manually before every call. However, the stub version of the function used when the FCP driver is disabled returns -ENOSYS unconditionally, resulting in a different API contract for the two versions of the function.

As a user that requires FCP support will fail at probe time when calling rcar_fcp_get() if the FCP driver is disabled, the stub version of the rcar_fcp_enable() function will only be called with a NULL FCP device. We can thus return 0 unconditionally to align the behaviour with the normal version of the function.

---
 include/media/rcar-fcp.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -29,7 +29,7 @@ static inline struct rcar_fcp_device *rc
 static inline void rcar_fcp_put(struct rcar_fcp_device *fcp) { }
 static inline int rcar_fcp_enable(struct rcar_fcp_device *fcp)
 {
-	return -ENOSYS;
+	return 0;
 }
 static inline void rcar_fcp_disable(struct rcar_fcp_device *fcp) { }
 #endif

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/v4l-rcar-fcp-don-t-force-users-to-check-for-disabled-fcp-support.patch