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

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

[gregkh]

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 <stable@vger.kernel.org> know about it.


>From fd44aa9a254b18176ec3792a18e7de6977030ca8 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
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 <laurent.pinchart+renesas@ideasonboard.com>

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.

Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/include/media/rcar-fcp.h
+++ b/include/media/rcar-fcp.h
@@ -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 laurent.pinchart+renesas@ideasonboard.com are

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