linux-kernel - [PATCH 5.15 126/177] usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock

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Message-Id: <20211220143044.320969400@linuxfoundation.org>
Date:   Mon, 20 Dec 2021 15:34:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Ken (Jian) He" <jianhe@...arella.com>,
        Pawel Laszczak <pawell@...ence.com>,
        Peter Chen <peter.chen@...nel.org>
Subject: [PATCH 5.15 126/177] usb: cdnsp: Fix lack of spin_lock_irqsave/spin_lock_restore

From: Pawel Laszczak <pawell@...ence.com>

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@...arella.com>
cc: <stable@...r.kernel.org>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Reviewed-by: Peter Chen <peter.chen@...nel.org>
Link: https://lore.kernel.org/r/20211214045527.26823-1-pawell@gli-login.cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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;
 }