Messages in this thread Patch in this message | | | From | Pawel Laszczak <> | Subject | [PATCH] usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock_restore | Date | Mon, 13 Dec 2021 13:20:01 +0100 |
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From: Pawel Laszczak <pawell@cadence.com>
Patch puts content of cdnsp_gadget_pullup function inside spin_lock_irqsave and spin_lock_restore section. This construction is required here to keep the data consistency, otherwise some data can be changed e.g. from interrupt context.
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") Reported-by: Ken (Jian) He <jianhe@ambarella.com> cc: <stable@vger.kernel.org> Signed-off-by: Pawel Laszczak <pawell@cadence.com> --- drivers/usb/cdns3/cdnsp-gadget.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c index f6d231760a6a..d0c040556984 100644 --- a/drivers/usb/cdns3/cdnsp-gadget.c +++ b/drivers/usb/cdns3/cdnsp-gadget.c @@ -1544,8 +1544,10 @@ static int cdnsp_gadget_pullup(struct usb_gadget *gadget, int is_on) { struct cdnsp_device *pdev = gadget_to_cdnsp(gadget); struct cdns *cdns = dev_get_drvdata(pdev->dev); + unsigned long flags; trace_cdnsp_pullup(is_on); + spin_lock_irqsave(&pdev->lock, flags); if (!is_on) { cdnsp_reset_device(pdev); @@ -1553,6 +1555,9 @@ static int cdnsp_gadget_pullup(struct usb_gadget *gadget, int is_on) } else { cdns_set_vbus(cdns); } + + spin_unlock_irqrestore(&pdev->lock, flags); + return 0; } -- 2.25.1
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