linux-kernel - [PATCH 4.13 16/85] usb: musb: sunxi: Explicitly release USB PHY on exit

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Message-Id: <20171024125654.677423517@linuxfoundation.org>
Date:   Tue, 24 Oct 2017 15:06:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonathan Liu <net147@...il.com>,
        Bin Liu <b-liu@...com>
Subject: [PATCH 4.13 16/85] usb: musb: sunxi: Explicitly release USB PHY on exit

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jonathan Liu <net147@...il.com>

commit 6ed05c68cbcae42cd52b8e53b66952bfa9c002ce upstream.

This fixes a kernel oops when unloading the driver due to usb_put_phy
being called after usb_phy_generic_unregister when the device is
detached. Calling usb_phy_generic_unregister causes x->dev->driver to
be NULL in usb_put_phy and results in a NULL pointer dereference.

Signed-off-by: Jonathan Liu <net147@...il.com>
Signed-off-by: Bin Liu <b-liu@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/sunxi.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -297,6 +297,8 @@ static int sunxi_musb_exit(struct musb *
 	if (test_bit(SUNXI_MUSB_FL_HAS_SRAM, &glue->flags))
 		sunxi_sram_release(musb->controller->parent);
 
+	devm_usb_put_phy(glue->dev, glue->xceiv);
+
 	return 0;
 }