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FROMGIT: usb: dwc3: gadget: Avoid continuing preparing TRBs during teardown

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Add checks similar to dwc3_gadget_ep_queue() before kicking off
transfers after getting an endpoint completion event.   Since cleaning
up completed requests will momentarily unlock dwc->lock, there is a
chance for a sequence like pullup disable to be executed.  This can
lead to preparing a TRB, which will be removed by the pullup disable
routine.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1616146285-19149-2-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 02fa4b9802
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iece6f327490956f592431725fe1cddc93907fbc1
This commit is contained in:
Wesley Cheng 2021-03-19 02:31:24 -07:00 committed by Greg Kroah-Hartman
parent c9050b8a42
commit 530d7b8c8b
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/dwc3/gadget.c
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@ -2933,6 +2933,11 @@ static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)
{
struct dwc3_request *req;
struct dwc3 *dwc = dep->dwc;
if (!dep->endpoint.desc || !dwc->pullups_connected ||
!dwc->connected)
return false;
if (!list_empty(&dep->pending_list))
return true;