From: Kishon Vijay Abraham I <kishon@ti.com>
Date: Fri, 15 Mar 2013 13:28:50 +0000 (+0530)
Subject: usb: musb: gadget: do *unmap_dma_buffer* only for valid DMA addr
X-Git-Tag: v3.9-rc4~11^2~22^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06d9db7273c7bd5b07624b313faeea57a4b31056;p=pandora-kernel.git

usb: musb: gadget: do *unmap_dma_buffer* only for valid DMA addr

musb does not use DMA buffer for ep0 but it uses the same giveback
function *musb_g_giveback* for all endpoints (*musb_g_ep0_giveback* calls
*musb_g_giveback*). So for ep0 case request.dma will be '0'
and will result in kernel OOPS if tried to *unmap_dma_buffer* for requests in
ep0. Fixed it by doing *unmap_dma_buffer* only for valid DMA addr and
checking that musb_ep->dma is valid when unmapping.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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