genirq: Prevent chip buslock deadlock

commit abc7e40c81d113ef4bacb556f0a77ca63ac81d85 upstream.

If a interrupt chip utilizes chip->buslock then free_irq() can
deadlock in the following way:

CPU0				CPU1
				interrupt(X) (Shared or spurious)
free_irq(X)			interrupt_thread(X)
chip_bus_lock(X)
				   irq_finalize_oneshot(X)
				     chip_bus_lock(X)
synchronize_irq(X)

synchronize_irq() waits for the interrupt thread to complete,
i.e. forever.

Solution is simple: Drop chip_bus_lock() before calling
synchronize_irq() as we do with the irq_desc lock. There is nothing to
be protected after the point where irq_desc lock has been released.

This adds chip_bus_lock/unlock() to the remove_irq() code path, but
that's actually correct in the case where remove_irq() is called on
such an interrupt. The current users of remove_irq() are not affected
as none of those interrupts is on a chip which requires buslock.

Reported-by: Fredrik Markström <fredrik.markstrom@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 127a32e..8080f98 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1200,6 +1200,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
        if (!desc)
                return NULL;
 
+       chip_bus_lock(desc);
        raw_spin_lock_irqsave(&desc->lock, flags);
 
        /*
@@ -1213,7 +1214,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
                if (!action) {
                        WARN(1, "Trying to free already-free IRQ %d\n", irq);
                        raw_spin_unlock_irqrestore(&desc->lock, flags);
-
+                       chip_bus_sync_unlock(desc);
                        return NULL;
                }
 
@@ -1242,6 +1243,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 #endif
 
        raw_spin_unlock_irqrestore(&desc->lock, flags);
+       chip_bus_sync_unlock(desc);
 
        unregister_handler_proc(irq, action);
 
@@ -1316,9 +1318,7 @@ void free_irq(unsigned int irq, void *dev_id)
                desc->affinity_notify = NULL;
 #endif
 
-       chip_bus_lock(desc);
        kfree(__free_irq(irq, dev_id));
-       chip_bus_sync_unlock(desc);
 }
 EXPORT_SYMBOL(free_irq);