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usb: renesas_usbhs: Flush the notify_hotplug_work

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commit 552ca6b87e3778f3dd5b87842f95138162e16c82 upstream.

When performing continuous unbind/bind operations on the USB drivers
available on the Renesas RZ/G2L SoC, a kernel crash with the message
"Unable to handle kernel NULL pointer dereference at virtual address"
may occur. This issue points to the usbhsc_notify_hotplug() function.

Flush the delayed work to avoid its execution when driver resources are
unavailable.

Fixes: bc57381e63 ("usb: renesas_usbhs: use delayed_work instead of work_struct")
Cc: stable <stable@kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/r/20250225110248.870417-4-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Claudiu Beznea 2025-02-25 13:02:48 +02:00 • committed by Greg Kroah-Hartman
commit 4cd847a7b6
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/renesas_usbhs/common.c
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@ -779,6 +779,8 @@ static int usbhs_remove(struct platform_device *pdev)
dev_dbg(&pdev->dev, "usb remove\n");
flush_delayed_work(&priv->notify_hotplug_work);
/* power off */
if (!usbhs_get_dparam(priv, runtime_pwctrl))
usbhsc_power_ctrl(priv, 0);