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usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

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[ Upstream commit 040f2dbd2010c43f33ad27249e6dac48456f4d99 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wesley Cheng 2022-07-27 19:06:47 -07:00 committed by Greg Kroah-Hartman
parent ff23c7277f
commit 9c28189bb6
1 changed files with 5 additions and 3 deletions
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8
drivers/usb/dwc3/gadget.c
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@ -2155,9 +2155,6 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
is_on = !!is_on;
if (dwc->pullups_connected == is_on)
return 0;
dwc->softconnect = is_on;
/*
* Per databook, when we want to stop the gadget, if a control transfer
@ -2194,6 +2191,11 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
return 0;
}
if (dwc->pullups_connected == is_on) {
pm_runtime_put(dwc->dev);
return 0;
}
if (!is_on) {
ret = dwc3_gadget_soft_disconnect(dwc);
} else {