[PATCH 5.19 111/155] usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

Greg Kroah-Hartman
2022-09-06T14:15:48Z

From: Wesley Cheng <quic_wcheng@quicinc.com>

commit 040f2dbd2010c43f33ad27249e6dac48456f4d99 upstream.

Relocate the pullups_connected check until after it is ensured that there
are no runtime PM transitions. If another context triggered the DWC3
core's runtime resume, it may have already enabled the Run/Stop. Do not
re-run the entire pullup sequence again, as it may issue a core soft
reset while Run/Stop is already set.

This patch depends on
commit 69e131d1ac4e ("usb: dwc3: gadget: Prevent repeat pullup()")

Fixes: 77adb8bdf422 ("usb: dwc3: gadget: Allow runtime suspend if UDC unbinded")
Cc: stable <stable@kernel.org>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20220728020647.9377-1-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/dwc3/gadget.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2538,9 +2538,6 @@ static int dwc3_gadget_pullup(struct usb

is_on = !!is_on;

- if (dwc->pullups_connected == is_on)
- return 0;
-
dwc->softconnect = is_on;

/*
@@ -2564,6 +2561,11 @@ static int dwc3_gadget_pullup(struct usb
pm_runtime_put(dwc->dev);
return 0;
}
+
+ if (dwc->pullups_connected == is_on) {
+ pm_runtime_put(dwc->dev);
+ return 0;
+ }

if (!is_on) {
ret = dwc3_gadget_soft_disconnect(dwc);