From: Bhupesh Sharma <bhupesh.sharma@st.com>
Date: Fri, 23 Mar 2012 16:53:13 +0000 (+0530)
Subject: usb: gadget: uvc: Remove non-required locking from 'uvc_queue_next_buffer' routine
X-Git-Tag: v3.4-rc4~14^2~14^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6190c79df861d2c78a7448fe6d4260e5fa53b9b9;p=pandora-kernel.git

usb: gadget: uvc: Remove non-required locking from 'uvc_queue_next_buffer' routine

This patch removes the non-required spinlock acquire/release calls on
'queue->irqlock' from 'uvc_queue_next_buffer' routine.

This routine is called from 'video->encode' function (which translates to
either 'uvc_video_encode_bulk' or 'uvc_video_encode_isoc') in 'uvc_video.c'.
As, the 'video->encode' routines are called with 'queue->irqlock' already held,
so acquiring a 'queue->irqlock' again in 'uvc_queue_next_buffer' routine causes
a spin lock recursion.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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