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Subject[PATCH 1/2] usb: musb: fix bug - don't mess up count number and CSR0 register value
Date
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
drivers/usb/musb/musb_gadget_ep0.c | 24 ++++++++++++------------
1 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index a57652f..3f5e30d 100644
--- 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);
}

/*
--
1.5.6

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