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USB: ci13xxx_udc: fix logic to mark request dma addresses as invalid 

The current driver sets the request's dma addr (mReq->req.dma) to 0 to
mark the DMA address as not valid. However some gadget drivers
(e.g. gadgetfs) set the request's dma addr to DMA_ADDR_INVALID to mark
the address as invalid. This leads to bogus data send because the
ci13xxx_udc driver assumes the request has already been mapped.

This patch fixes the problem, by using DMA_ADDR_INVALID instead of 0
to mark the request's DMA address as invalid.

Tested-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Grzeschik 2011-10-10 18:38:06 +02:00 committed by Greg Kroah-Hartman
parent 001428e487
commit 954aad8cd1
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/usb/gadget/ci13xxx_udc.c
View File

@ -71,6 +71,9 @@
/******************************************************************************
* DEFINE
*****************************************************************************/
#define DMA_ADDR_INVALID (~(dma_addr_t)0)
/* ctrl register bank access */
static DEFINE_SPINLOCK(udc_lock);
@ -1434,7 +1437,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
return -EALREADY;
mReq->req.status = -EALREADY;
if (length && !mReq->req.dma) {
if (length && mReq->req.dma == DMA_ADDR_INVALID) {
mReq->req.dma = \
dma_map_single(mEp->device, mReq->req.buf,
length, mEp->dir ? DMA_TO_DEVICE :
@ -1453,7 +1456,7 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
dma_unmap_single(mEp->device, mReq->req.dma,
length, mEp->dir ? DMA_TO_DEVICE :
DMA_FROM_DEVICE);
mReq->req.dma = 0;
mReq->req.dma = DMA_ADDR_INVALID;
mReq->map = 0;
}
return -ENOMEM;
@ -1549,7 +1552,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
if (mReq->map) {
dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length,
mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
mReq->req.dma = 0;
mReq->req.dma = DMA_ADDR_INVALID;
mReq->map = 0;
}
@ -2189,6 +2192,7 @@ static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
mReq = kzalloc(sizeof(struct ci13xxx_req), gfp_flags);
if (mReq != NULL) {
INIT_LIST_HEAD(&mReq->queue);
mReq->req.dma = DMA_ADDR_INVALID;
mReq->ptr = dma_pool_alloc(mEp->td_pool, gfp_flags,
&mReq->dma);
@ -2328,7 +2332,7 @@ static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
if (mReq->map) {
dma_unmap_single(mEp->device, mReq->req.dma, mReq->req.length,
mEp->dir ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
mReq->req.dma = 0;
mReq->req.dma = DMA_ADDR_INVALID;
mReq->map = 0;
}
req->status = -ECONNRESET;