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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2009-12-15 13:30:01 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-23 11:34:18 -0800
commit17be5c5f5ef99c94374e07f71effa78e93a20eda (patch)
tree4759c8d6a49232047ab483a2a43daec7f869fe77 /drivers/usb
parent93aa3dab008421789aa0f8865a62a52ae13269a3 (diff)
USB: musb: gadget_ep0: avoid SetupEnd interrupt
Gadget stalling a zero-length SETUP request results in this error message: SetupEnd came in a wrong ep0stage idle In order to avoid it, always set the CSR0.DataEnd bit after detecting a zero- length request. Add the missing '\n' to the error message itself as well... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Acked-by: Anand Gadiyar <gadiyar@ti.com> Cc: stable <stable@kernel.org> Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb/musb_gadget_ep0.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 8fba3f11e47..53d06451f82 100644
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -664,7 +664,7 @@ irqreturn_t musb_g_ep0_irq(struct musb *musb)
musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
break;
default:
- ERR("SetupEnd came in a wrong ep0stage %s",
+ ERR("SetupEnd came in a wrong ep0stage %s\n",
decode_ep0stage(musb->ep0_state));
}
csr = musb_readw(regs, MUSB_CSR0);
@@ -787,12 +787,18 @@ setup:
handled = service_zero_data_request(
musb, &setup);
+ /*
+ * We're expecting no data in any case, so
+ * always set the DATAEND bit -- doing this
+ * here helps avoid SetupEnd interrupt coming
+ * in the idle stage when we're stalling...
+ */
+ musb->ackpend |= MUSB_CSR0_P_DATAEND;
+
/* status stage might be immediate */
- if (handled > 0) {
- musb->ackpend |= MUSB_CSR0_P_DATAEND;
+ if (handled > 0)
musb->ep0_state =
MUSB_EP0_STAGE_STATUSIN;
- }
break;
/* sequence #1 (IN to host), includes GET_STATUS