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From: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
To: Bin Liu <b-liu-l0cyMroinI0@public.gmane.org>
Cc: Alexandre Bailon
	<abailon-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
	Andreas Kemnade <andreas-cLv4Z9ELZ06ZuzBka8ofvg@public.gmane.org>,
	Boris Brezillon
	<boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Felipe Balbi <balbi-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	George Cherian <george.cherian-l0cyMroinI0@public.gmane.org>,
	Greg Kroah-Hartman
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	Grygorii Strashko
	<grygorii.strashko-l0cyMroinI0@public.gmane.org>,
	Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org>,
	Ivaylo Dimitrov
	<ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Ladislav Michl <ladis-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>,
	Laurent Pinchart
	<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>,
	Sergei Shtylyov
	<sergei.shtylyov-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>,
	linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] usb: musb: Fix external abort on non-linefetch for musb_irq_work()
Date: Fri, 20 Jan 2017 11:27:38 -0800	[thread overview]
Message-ID: <20170120192738.24973-1-tony@atomide.com> (raw)

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)

Signed-off-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
---

I found one more corner case issue in my usb cable plugfest yesterday.

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

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1925,6 +1925,14 @@ static void musb_pm_runtime_check_session(struct musb *musb)
 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);
 
@@ -1932,6 +1940,9 @@ static void musb_irq_work(struct work_struct *data)
 		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)
-- 
2.11.0
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                 reply	other threads:[~2017-01-20 19:27 UTC|newest]

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