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| author |  Elson Roy Serrao <quic_eserrao@quicinc.com>
| 2023-06-01 14:27:30 -0700 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2023-06-13 11:52:20 +0200 |
| commit | 00f8205ffcf112dcef14f8151d78075d38d22c08 (patch) | |
| tree | ac01ae08e1b168db367d5e522344ef0fe777ea4a /drivers/usb | |
| parent | usb: gadget: udc: renesas_usb3: Fix RZ/V2M {modprobe,bind} error (diff) | |
| download | linux-00f8205ffcf112dcef14f8151d78075d38d22c08.tar.gz linux-00f8205ffcf112dcef14f8151d78075d38d22c08.tar.bz2 linux-00f8205ffcf112dcef14f8151d78075d38d22c08.zip | |
usb: dwc3: gadget: Reset num TRBs before giving back the request
Consider a scenario where cable disconnect happens when there is an active
usb reqest queued to the UDC. As part of the disconnect we would issue an
end transfer with no interrupt-on-completion before giving back this
request. Since we are giving back the request without skipping TRBs the
num_trbs field of dwc3_request still holds the stale value previously used.
Function drivers re-use same request for a given bind-unbind session and
hence their dwc3_request context gets preserved across cable
disconnect/connect. When such a request gets re-queued after cable connect,
we would increase the num_trbs field on top of the previous stale value
thus incorrectly representing the number of TRBs used. Fix this by
resetting num_trbs field before giving back the request.
Fixes: 09fe1f8d7e2f ("usb: dwc3: gadget: track number of TRBs per request")
Cc: stable <stable@kernel.org>
Signed-off-by: Elson Roy Serrao <quic_eserrao@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Message-ID: <1685654850-8468-1-git-send-email-quic_eserrao@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index d831f5acf7b5..b78599dd705c 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -198,6 +198,7 @@ static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep, list_del(&req->list); req->remaining = 0; req->needs_extra_trb = false; + req->num_trbs = 0; if (req->request.status == -EINPROGRESS) req->request.status = status; |