linux-kernel - [PATCH v2] usb: musb: sunxi: Explicitly release USB PHY on exit

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Message-Id: <20171010024525.21971-1-net147@gmail.com>
Date:   Tue, 10 Oct 2017 13:45:25 +1100
From:   Jonathan Liu <net147@...il.com>
To:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Jonathan Liu <net147@...il.com>
Subject: [PATCH v2] usb: musb: sunxi: Explicitly release USB PHY on exit

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.

Cc: stable@...r.kernel.org # v4.3+
Signed-off-by: Jonathan Liu <net147@...il.com>
---
Changes for v2:
 - Use devm_usb_put_phy instead of usb_put_phy

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

diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
index c9a09b5bb6e5..dc353e24d53c 100644
--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -297,6 +297,8 @@ static int sunxi_musb_exit(struct musb *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;
 }
 
-- 
2.14.2