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usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock_restore 

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: 3d82904559 ("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>
--

Changelog:
v2:
- added disable_irq/enable_irq as sugester by Peter Chen

drivers/usb/cdns3/cdnsp-gadget.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Reviewed-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20211214045527.26823-1-pawell@gli-login.cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawel Laszczak 2021-12-14 05:55:27 +01:00 committed by Greg Kroah-Hartman
parent 0ad3bd562b
commit 4c4e162d9c
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/usb/cdns3/cdnsp-gadget.c
View File

@ -1541,15 +1541,27 @@ 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);
/*
* Disable events handling while controller is being
* enabled/disabled.
*/
disable_irq(cdns->dev_irq);
spin_lock_irqsave(&pdev->lock, flags);
if (!is_on) {
cdnsp_reset_device(pdev);
cdns_clear_vbus(cdns);
} else {
cdns_set_vbus(cdns);
}
spin_unlock_irqrestore(&pdev->lock, flags);
enable_irq(cdns->dev_irq);
return 0;
}