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Subject[PATCH] late spinlock initialization in ieee1394/ohci
spinlock used in irq handler should be initialized before registering
irq, even if we know that our device has interrupts disabled; handler
is registered shared and taking spinlock is done unconditionally. As
it is, we can and do get oopsen on boot for some configuration, depending
on irq routing - I've got a reproducer.

Signed-off-by: Al Viro <>
diff -urN RC13-rc7-base/drivers/ieee1394/ohci1394.c current/drivers/ieee1394/ohci1394.c
--- RC13-rc7-base/drivers/ieee1394/ohci1394.c 2005-08-24 01:56:37.000000000 -0400
+++ current/drivers/ieee1394/ohci1394.c 2005-08-25 18:02:49.000000000 -0400
@@ -478,7 +478,6 @@
int num_ports, i;

- spin_lock_init(&ohci->event_lock);

/* Put some defaults to these undefined bus options */
buf = reg_read(ohci, OHCI1394_BusOptions);
@@ -3402,7 +3401,14 @@
/* We hopefully don't have to pre-allocate IT DMA like we did
* for IR DMA above. Allocate it on-demand and mark inactive. */
ohci->it_legacy_context.ohci = NULL;
+ spin_lock_init(&ohci->event_lock);

+ /*
+ * interrupts are disabled, all right, but... due to SA_SHIRQ we
+ * might get called anyway. We'll see no event, of course, but
+ * we need to get to that "no event", so enough should be initialized
+ * by that point.
+ */
if (request_irq(dev->irq, ohci_irq_handler, SA_SHIRQ,
OHCI1394_DRIVER_NAME, ohci))
FAIL(-ENOMEM, "Failed to allocate shared interrupt %d", dev->irq);
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