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usb/hcd: Send a uevent signaling that the host controller had died

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This change will send an OFFLINE event to udev with the ERROR=DEAD
environment variable set when the HC dies.

By notifying user space the appropriate policies can be applied.
i.e.,
 * Collect error logs.
 * Notify the user that USB is no longer functional.
 * Perform a graceful reboot.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Raul E Rangel
2019-04-19 09:30:22 -06:00
committed by Greg Kroah-Hartman
parent cf28369c63
commit a4d6a2989d
3 changed files with 52 additions and 0 deletions
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24
drivers/usb/core/hcd.c
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@@ -2435,6 +2435,19 @@ EXPORT_SYMBOL_GPL(usb_hcd_irq);
/*-------------------------------------------------------------------------*/
/* Workqueue routine for when the root-hub has died. */
static void hcd_died_work(struct work_struct *work)
{
struct usb_hcd *hcd = container_of(work, struct usb_hcd, died_work);
static char *env[] = {
"ERROR=DEAD",
NULL
};
/* Notify user space that the host controller has died */
kobject_uevent_env(&hcd->self.root_hub->dev.kobj, KOBJ_OFFLINE, env);
}
/**
* usb_hc_died - report abnormal shutdown of a host controller (bus glue)
* @hcd: pointer to the HCD representing the controller
@@ -2475,6 +2488,13 @@ void usb_hc_died (struct usb_hcd *hcd)
usb_kick_hub_wq(hcd->self.root_hub);
}
}
/* Handle the case where this function gets called with a shared HCD */
if (usb_hcd_is_primary_hcd(hcd))
schedule_work(&hcd->died_work);
else
schedule_work(&hcd->primary_hcd->died_work);
spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
/* Make sure that the other roothub is also deallocated. */
}
@@ -2542,6 +2562,8 @@ struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
#endif
INIT_WORK(&hcd->died_work, hcd_died_work);
hcd->driver = driver;
hcd->speed = driver->flags & HCD_MASK;
hcd->product_desc = (driver->product_desc) ? driver->product_desc :
@@ -2895,6 +2917,7 @@ error_create_attr_group:
#ifdef CONFIG_PM
cancel_work_sync(&hcd->wakeup_work);
#endif
cancel_work_sync(&hcd->died_work);
mutex_lock(&usb_bus_idr_lock);
usb_disconnect(&rhdev); /* Sets rhdev to NULL */
mutex_unlock(&usb_bus_idr_lock);
@@ -2955,6 +2978,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
#ifdef CONFIG_PM
cancel_work_sync(&hcd->wakeup_work);
#endif
cancel_work_sync(&hcd->died_work);
mutex_lock(&usb_bus_idr_lock);
usb_disconnect(&rhdev); /* Sets rhdev to NULL */