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

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@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tony Lindgren 2017-01-24 09:18:58 -06:00 committed by Greg Kroah-Hartman
parent 407788b51d
commit 3ba7b7795b
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/musb/musb_core.c
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@ -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)