This is a note to let you know that I've just added the patch titled
usb: dwc3: Wait unconditionally after issuing EndXfer command
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-wait-unconditionally-after-issuing-endxfer-command.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1d26ba0944d398f88aaf997bda3544646cf21945 Mon Sep 17 00:00:00 2001
From: Prashanth K <quic_prashk@xxxxxxxxxxx>
Date: Thu, 2 May 2024 10:11:03 +0530
Subject: usb: dwc3: Wait unconditionally after issuing EndXfer command
From: Prashanth K <quic_prashk@xxxxxxxxxxx>
commit 1d26ba0944d398f88aaf997bda3544646cf21945 upstream.
Currently all controller IP/revisions except DWC3_usb3 >= 310a
wait 1ms unconditionally for ENDXFER completion when IOC is not
set. This is because DWC_usb3 controller revisions >= 3.10a
supports GUCTL2[14: Rst_actbitlater] bit which allows polling
CMDACT bit to know whether ENDXFER command is completed.
Consider a case where an IN request was queued, and parallelly
soft_disconnect was called (due to ffs_epfile_release). This
eventually calls stop_active_transfer with IOC cleared, hence
send_gadget_ep_cmd() skips waiting for CMDACT cleared during
EndXfer. For DWC3 controllers with revisions >= 310a, we don't
forcefully wait for 1ms either, and we proceed by unmapping the
requests. If ENDXFER didn't complete by this time, it leads to
SMMU faults since the controller would still be accessing those
requests.
Fix this by ensuring ENDXFER completion by adding 1ms delay in
__dwc3_stop_active_transfer() unconditionally.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: b353eb6dc285 ("usb: dwc3: gadget: Skip waiting for CMDACT cleared during endxfer")
Signed-off-by: Prashanth K <quic_prashk@xxxxxxxxxxx>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240502044103.1066350-1-quic_prashk@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1718,7 +1718,6 @@ static int __dwc3_gadget_get_frame(struc
*/
static int __dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt)
{
- struct dwc3 *dwc = dep->dwc;
struct dwc3_gadget_ep_cmd_params params;
u32 cmd;
int ret;
@@ -1743,8 +1742,7 @@ static int __dwc3_stop_active_transfer(s
dep->resource_index = 0;
if (!interrupt) {
- if (!DWC3_IP_IS(DWC3) || DWC3_VER_IS_PRIOR(DWC3, 310A))
- mdelay(1);
+ mdelay(1);
dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
} else if (!ret) {
dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
Patches currently in stable-queue which might be from quic_prashk@xxxxxxxxxxx are
queue-6.8/usb-dwc3-wait-unconditionally-after-issuing-endxfer-command.patch
