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FROMGIT: usb: dwc3: gadget: Bail out in pullup if soft reset timeout happens

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If the core soft reset timeout happens, avoid setting up event
buffers and starting gadget as the writes to these registers
may not reflect when in reset and setting the run stop bit
can lead the controller to access wrong event buffer address
resulting in a crash.

Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230510075252.31023-2-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 275538389
(cherry picked from commit 813f44d57e19ccaa7330e829bd913515be42719d https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Change-Id: Ieb7fe9f6d0dc64814cf6f9b86d5ee188d07de537
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
This commit is contained in:
Krishna Kurapati 2023-05-10 13:22:51 +05:30 committed by Matthias Männich
parent 79b7e0db16
commit 5af5006061
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/dwc3/gadget.c
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@ -2645,13 +2645,16 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
* device-initiated disconnect requires a core soft reset
* (DCTL.CSftRst) before enabling the run/stop bit.
*/
dwc3_core_soft_reset(dwc);
ret = dwc3_core_soft_reset(dwc);
if (ret)
goto done;
dwc3_event_buffers_setup(dwc);
__dwc3_gadget_start(dwc);
ret = dwc3_gadget_run_stop(dwc, true);
}
done:
pm_runtime_put(dwc->dev);
return ret;