usb: musb: do not mess up count number and CSR0 register value

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index a57652f..3f5e30d 100644 (file)
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -437,7 +437,7 @@ static void ep0_rxstate(struct musb *musb)
 {
        void __iomem            *regs = musb->control_ep->regs;
        struct usb_request      *req;
-       u16                     tmp;
+       u16                     count, csr;
 
        req = next_ep0_request(musb);
 
@@ -449,35 +449,35 @@ static void ep0_rxstate(struct musb *musb)
                unsigned        len = req->length - req->actual;
 
                /* read the buffer */
-               tmp = musb_readb(regs, MUSB_COUNT0);
-               if (tmp > len) {
+               count = musb_readb(regs, MUSB_COUNT0);
+               if (count > len) {
                        req->status = -EOVERFLOW;
-                       tmp = len;
+                       count = len;
                }
-               musb_read_fifo(&musb->endpoints[0], tmp, buf);
-               req->actual += tmp;
-               tmp = MUSB_CSR0_P_SVDRXPKTRDY;
-               if (tmp < 64 || req->actual == req->length) {
+               musb_read_fifo(&musb->endpoints[0], count, buf);
+               req->actual += count;
+               csr = MUSB_CSR0_P_SVDRXPKTRDY;
+               if (count < 64 || req->actual == req->length) {
                        musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
-                       tmp |= MUSB_CSR0_P_DATAEND;
+                       csr |= MUSB_CSR0_P_DATAEND;
                } else
                        req = NULL;
        } else
-               tmp = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL;
+               csr = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL;
 
 
        /* Completion handler may choose to stall, e.g. because the
         * message just received holds invalid data.
         */
        if (req) {
-               musb->ackpend = tmp;
+               musb->ackpend = csr;
                musb_g_ep0_giveback(musb, req);
                if (!musb->ackpend)
                        return;
                musb->ackpend = 0;
        }
        musb_ep_select(musb->mregs, 0);
-       musb_writew(regs, MUSB_CSR0, tmp);
+       musb_writew(regs, MUSB_CSR0, csr);
 }
 
 /*