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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>
This commit is contained in:
Bryan Wu 2008-09-11 11:53:22 +03:00 committed by Greg Kroah-Hartman
parent 2492e6747f
commit 64ca44a65a
1 changed files with 12 additions and 12 deletions
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24
drivers/usb/musb/musb_gadget_ep0.c
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@ -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);
}
/*