From: Pawel Laszczak pawell@cadence.com
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: 7733f6c32e36 ("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 --- drivers/usb/cdns3/gadget.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/usb/cdns3/gadget.c +++ b/drivers/usb/cdns3/gadget.c @@ -2166,6 +2166,7 @@ int __cdns3_gadget_ep_clear_halt(struct 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 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
if (request) { if (trb) - trb->control = trb->control ^ TRB_CYCLE; + *trb = trb_tmp; + cdns3_rearm_transfer(priv_ep, 1); }