From b71bfa6a117e070139ce2cf23175378f276b9dd8 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Tue, 15 Dec 2009 13:30:01 +0200 Subject: [PATCH] USB: musb: gadget_ep0: avoid SetupEnd interrupt commit 17be5c5f5ef99c94374e07f71effa78e93a20eda upstream. 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 Acked-by: Anand Gadiyar Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/musb_gadget_ep0.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c index 1c44b975049c..067e5a95b149 100644 --- a/drivers/usb/musb/musb_gadget_ep0.c +++ b/drivers/usb/musb/musb_gadget_ep0.c @@ -647,7 +647,7 @@ 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); @@ -770,12 +770,18 @@ 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 -- 2.34.1