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usb: cdns3: Fix issue for clear halt endpoint

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commit b3fa25de31fb7e9afebe9599b8ff32eda13d7c94 upstream.

Path fixes bug which occurs during resetting endpoint in
__cdns3_gadget_ep_clear_halt function. During resetting endpoint
controller will change HW/DMA owned TRB. It set Abort flag in
trb->control and will change trb->length field. If driver want
to use the aborted trb it must update the changed field in
TRB.

Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
cc: <stable@vger.kernel.org>
Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Link: https://lore.kernel.org/r/20220329084605.4022-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawel Laszczak 2022-03-29 10:46:05 +02:00 committed by Greg Kroah-Hartman
parent 87b41b041c
commit a89c4b5868
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/cdns3/gadget.c
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@ -2166,6 +2166,7 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
struct usb_request *request;
struct cdns3_request *priv_req;
struct cdns3_trb *trb = NULL;
struct cdns3_trb trb_tmp;
int ret;
int val;
@ -2175,8 +2176,10 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
if (request) {
priv_req = to_cdns3_request(request);
trb = priv_req->trb;
if (trb)
if (trb) {
trb_tmp = *trb;
trb->control = trb->control ^ TRB_CYCLE;
}
}
writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
@ -2191,7 +2194,8 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
if (request) {
if (trb)
trb->control = trb->control ^ TRB_CYCLE;
*trb = trb_tmp;
cdns3_rearm_transfer(priv_ep, 1);
}