* [PATCH] usb: cdns3: Fix issue for clear halt endpoint
@ 2022-03-29 8:46 Pawel Laszczak
2022-04-09 2:35 ` Peter Chen
0 siblings, 1 reply; 2+ messages in thread
From: Pawel Laszczak @ 2022-03-29 8:46 UTC (permalink / raw)
To: peter.chen
Cc: pawell, rogerq, a-govindraju, gregkh, felipe.balbi, linux-usb,
linux-kernel, stable
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>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/cdns3/cdns3-gadget.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 80aaab159e58..3a9f0968fd24 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2682,6 +2682,7 @@ 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;
@@ -2691,8 +2692,10 @@ 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 ^ cpu_to_le32(TRB_CYCLE);
+ }
}
writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
@@ -2707,7 +2710,7 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
if (request) {
if (trb)
- trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE);
+ *trb = trb_tmp;
cdns3_rearm_transfer(priv_ep, 1);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] usb: cdns3: Fix issue for clear halt endpoint
2022-03-29 8:46 [PATCH] usb: cdns3: Fix issue for clear halt endpoint Pawel Laszczak
@ 2022-04-09 2:35 ` Peter Chen
0 siblings, 0 replies; 2+ messages in thread
From: Peter Chen @ 2022-04-09 2:35 UTC (permalink / raw)
To: Pawel Laszczak
Cc: rogerq, a-govindraju, gregkh, felipe.balbi, linux-usb,
linux-kernel, stable
On 22-03-29 10:46:05, Pawel Laszczak wrote:
> Path fixes bug which occurs during resetting endpoint in
%s/Path/Patch, otherwise:
Acked-by: Peter Chen <peter.chen@kernel.org>
> __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>
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> ---
> drivers/usb/cdns3/cdns3-gadget.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 80aaab159e58..3a9f0968fd24 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2682,6 +2682,7 @@ 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;
>
> @@ -2691,8 +2692,10 @@ 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 ^ cpu_to_le32(TRB_CYCLE);
> + }
> }
>
> writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
> @@ -2707,7 +2710,7 @@ int __cdns3_gadget_ep_clear_halt(struct cdns3_endpoint *priv_ep)
>
> if (request) {
> if (trb)
> - trb->control = trb->control ^ cpu_to_le32(TRB_CYCLE);
> + *trb = trb_tmp;
>
> cdns3_rearm_transfer(priv_ep, 1);
> }
> --
> 2.25.1
>
--
Thanks,
Peter Chen
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