Patch "usb: musb: Fix external abort on non-linefetch for musb_irq_work()" has been added to the 4.9-stable tree

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

usb: musb: Fix external abort on non-linefetch for musb_irq_work()

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-musb-fix-external-abort-on-non-linefetch-for-musb_irq_work.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Tony Lindgren <[email protected]>
Date: Tue, 24 Jan 2017 09:18:58 -0600
Subject: usb: musb: Fix external abort on non-linefetch for musb_irq_work()

From: Tony Lindgren <[email protected]>

[ Upstream commit 3ba7b7795b7e8889af1377904c55c7fae9e0c775 ]

While testing musb host mode cable plugging on a BeagleBone, I came across this error:

Unhandled fault: external abort on non-linefetch (0x1008) at 0xd1dcfc60
...
[<bf668390>] (musb_default_readb [musb_hdrc]) from [<bf668578>] (musb_irq_work+0x1c/0x180 [musb_hdrc]) [<bf668578>] (musb_irq_work [musb_hdrc]) from [<c0156554>] (process_one_work+0x2b4/0x808) [<c0156554>] (process_one_work) from [<c015767c>] (worker_thread+0x3c/0x550) [<c015767c>] (worker_thread) from [<c015d568>] (kthread+0x104/0x148)
[<c015d568>] (kthread) from [<c01078d0>] (ret_from_fork+0x14/0x24)

---
 drivers/usb/musb/musb_core.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

@@ -1909,6 +1909,14 @@ static void musb_pm_runtime_check_sessio
 static void musb_irq_work(struct work_struct *data)
 {
 	struct musb *musb = container_of(data, struct musb, irq_work.work);
+	int error;
+
+	error = pm_runtime_get_sync(musb->controller);
+	if (error < 0) {
+		dev_err(musb->controller, "Could not enable: %i\n", error);
+
+		return;
+	}
 
 	musb_pm_runtime_check_session(musb);
 

@@ -1916,6 +1924,9 @@ static void musb_irq_work(struct work_st
 		musb->xceiv_old_state = musb->xceiv->otg->state;
 		sysfs_notify(&musb->controller->kobj, NULL, "mode");
 	}
+
+	pm_runtime_mark_last_busy(musb->controller);
+	pm_runtime_put_autosuspend(musb->controller);
 }
 
 static void musb_recover_from_babble(struct musb *musb)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/usb-musb-fix-external-abort-on-non-linefetch-for-musb_irq_work.patch