This is a note to let you know that I've just added the patch titled

usb: musb: ux500: Fix NULL pointer dereference at system PM

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: usb-musb-ux500-fix-null-pointer-dereference-at-system-pm.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 79c5623f1cb85f33403eb9f1e45124e9f56181f8 Mon Sep 17 00:00:00 2001

From: Ulf Hansson ulf.hansson@linaro.org Date: Mon, 25 Jan 2016 13:01:29 +0100 Subject: usb: musb: ux500: Fix NULL pointer dereference at system PM

From: Ulf Hansson ulf.hansson@linaro.org

commit 79c5623f1cb85f33403eb9f1e45124e9f56181f8 upstream.

The commit 7d32cdef5356 ("usb: musb: fail with error when no DMA controller set"), caused the core platform driver to correctly return an error code when fail probing.

Unfurtante it also caused bug for a NULL pointer dereference, during system suspend for the ux500 driver. The reason is a lacking validation of the corresponding ->driver_data pointer, which won't be set when the musb core driver fails to probe (or haven't yet been probed).

Fixes: 7d32cdef5356 ("usb: musb: fail with error when no DMA...") Acked-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Felipe Balbi balbi@kernel.org Signed-off-by: Oliver Neukum oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/usb/musb/ux500.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/usb/musb/ux500.c +++ b/drivers/usb/musb/ux500.c @@ -348,7 +348,9 @@ static int ux500_suspend(struct device * struct ux500_glue *glue = dev_get_drvdata(dev); struct musb *musb = glue_to_musb(glue);

- usb_phy_set_suspend(musb->xceiv, 1); + if (musb) + usb_phy_set_suspend(musb->xceiv, 1); + clk_disable_unprepare(glue->clk);

return 0; @@ -366,7 +368,8 @@ static int ux500_resume(struct device *d return ret; }

- usb_phy_set_suspend(musb->xceiv, 0); + if (musb) + usb_phy_set_suspend(musb->xceiv, 0);

return 0; }

Patches currently in stable-queue which might be from ulf.hansson@linaro.org are

queue-4.4/usb-musb-ux500-fix-null-pointer-dereference-at-system-pm.patch