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sh/intc: Fix potential race in installing chained IRQ handler 

Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by moving the call to
irq_set_chained_handler() after the function which sets up the handler
data.

Found by code inspection.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: linux-sh@vger.kernel.org
This commit is contained in:
Thomas Gleixner 2015-06-22 11:31:34 +02:00
parent ef80e87d20
commit beab99fe83
1 changed files with 2 additions and 1 deletions
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3
drivers/sh/intc/virq.c
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@ -243,8 +243,9 @@ restart:
*/
irq_set_nothread(irq);
irq_set_chained_handler(entry->pirq, intc_virq_handler);
/* Set handler data before installing the handler */
add_virq_to_pirq(entry->pirq, irq);
irq_set_chained_handler(entry->pirq, intc_virq_handler);
radix_tree_tag_clear(&d->tree, entry->enum_id,
INTC_TAG_VIRQ_NEEDS_ALLOC);