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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-06-22 11:31:34 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-06-25 11:57:19 +0200 |
| commit | beab99fe835be1d9ef1112dabdae3aa417126430 (patch) | |
| tree | 2353ffbdadfac7e4d9c2a96a6f81fffcdd5587ed | |
| parent | ef80e87d20d115eaee15da666f1a3551328205bb (diff) | |
| download | linux-stable-beab99fe835be1d9ef1112dabdae3aa417126430.tar.gz linux-stable-beab99fe835be1d9ef1112dabdae3aa417126430.tar.bz2 linux-stable-beab99fe835be1d9ef1112dabdae3aa417126430.zip | |
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
| -rw-r--r-- | drivers/sh/intc/virq.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/sh/intc/virq.c b/drivers/sh/intc/virq.c index f30ac9354ff2..f5f1b821241a 100644 --- a/drivers/sh/intc/virq.c +++ b/drivers/sh/intc/virq.c @@ -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); |