firewire: ohci: Fix deadlock at bus reset

Put bus_reset_work into its own workqueue.  By doing this, forward
progress of bus_reset_work() is guaranteed if the work is switched over
to a rescuer thread.

Switching work to a rescuer thread happens if a new worker thread could
not be allocated in certain time (MAYDAY_INITIAL_TIMEOUT, typically 10
ms).  This might not be possible under high memory pressure or even on a
heavily loaded embedded system running a slow serial console.

The former deadlock occured in the following situation:
The rescuer thread ran
fw_device_init->read_config_rom->read_rom->fw_run_transaction.
fw_run_transaction blocked waiting for the completion object.
This completion object would have been completed in bus_reset_work,
but this work was never executed in the rescuer thread due to its
strictly sequential behaviour.

[Stefan R.:  Removed WQ_NON_REENTRANT flag from allocation because
it is no longer needed in current kernels.  Add it back if you backport
to kernels older than 3.7, i.e. one which does not contain dbf2576e
"workqueue: make all workqueues non-reentrant".  Swapped order of
destroy_workqueue and pci_unregister_driver.]
Signed-off-by: Stephan Gatzka <stephan.gatzka@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/ohci.c

@@ -242,6 +242,8 @@ struct fw_ohci {
 	u32 self_id_buffer[512];
 };
 
+static struct workqueue_struct *selfid_workqueue;
+
 static inline struct fw_ohci *fw_ohci(struct fw_card *card)
 {
 	return container_of(card, struct fw_ohci, card);
@@ -2087,7 +2089,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 	log_irqs(ohci, event);
 
 	if (event & OHCI1394_selfIDComplete)
-		queue_work(fw_workqueue, &ohci->bus_reset_work);
+		queue_work(selfid_workqueue, &ohci->bus_reset_work);
 
 	if (event & OHCI1394_RQPkt)
 		tasklet_schedule(&ohci->ar_request_ctx.tasklet);
@@ -3872,12 +3874,17 @@ static struct pci_driver fw_ohci_pci_driver = {
 
 static int __init fw_ohci_init(void)
 {
+	selfid_workqueue = alloc_workqueue(KBUILD_MODNAME, WQ_MEM_RECLAIM, 0);
+	if (!selfid_workqueue)
+		return -ENOMEM;
+
 	return pci_register_driver(&fw_ohci_pci_driver);
 }
 
 static void __exit fw_ohci_cleanup(void)
 {
 	pci_unregister_driver(&fw_ohci_pci_driver);
+	destroy_workqueue(selfid_workqueue);
 }
 
 module_init(fw_ohci_init);