This is a note to let you know that I've just added the patch titled
usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock_restore
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-cdnsp-fix-lack-of-spin_lock_irqsave-spin_lock_restore.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4c4e162d9cf38528c4f13df09d5755cbc06f6c77 Mon Sep 17 00:00:00 2001
From: Pawel Laszczak <pawell@xxxxxxxxxxx>
Date: Tue, 14 Dec 2021 05:55:27 +0100
Subject: usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock_restore
From: Pawel Laszczak <pawell@xxxxxxxxxxx>
commit 4c4e162d9cf38528c4f13df09d5755cbc06f6c77 upstream.
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@xxxxxxxxxxxxx>
cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Pawel Laszczak <pawell@xxxxxxxxxxx>
Reviewed-by: Peter Chen <peter.chen@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211214045527.26823-1-pawell@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/cdns3/cdnsp-gadget.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/drivers/usb/cdns3/cdnsp-gadget.c
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -1541,15 +1541,27 @@ static int cdnsp_gadget_pullup(struct us
{
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;
}
Patches currently in stable-queue which might be from pawell@xxxxxxxxxxx are
queue-5.15/usb-cdnsp-fix-lack-of-spin_lock_irqsave-spin_lock_restore.patch
queue-5.15/usb-cdnsp-fix-issue-in-cdnsp_log_ep-trace-event.patch
queue-5.15/usb-cdnsp-fix-incorrect-calling-of-cdnsp_died-function.patch
queue-5.15/usb-cdnsp-fix-incorrect-status-for-control-request.patch
