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authorThomas Gleixner <tglx@linutronix.de>2015-06-21 21:16:04 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-06-25 12:56:45 +0300
commitb34cc62084e8c44f7c85e95bfc19e21d07f25173 (patch)
tree31be19efef3de39662ba41658e142df582d397fb /drivers/gpio
parent407a2c720556e8e340e06f6a7174f5d6d80cf9ea (diff)
downloadlinux-b34cc62084e8c44f7c85e95bfc19e21d07f25173.tar.xz
gpio/bcm-kona: Fix 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 converting to irq_set_chained_handler_and_data(). Search and conversion was done with coccinelle: @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); | -irq_set_chained_handler(E1, E3); ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); ... | -irq_set_chained_handler(E1, E3); ... ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Ray Jui <rjui@broadcom.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-gpio@vger.kernel.org
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-bcm-kona.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c
index b164ce837b43..fc214c3dfcc4 100644
--- a/drivers/gpio/gpio-bcm-kona.c
+++ b/drivers/gpio/gpio-bcm-kona.c
@@ -651,8 +651,9 @@ static int bcm_kona_gpio_probe(struct platform_device *pdev)
}
for (i = 0; i < kona_gpio->num_bank; i++) {
bank = &kona_gpio->banks[i];
- irq_set_chained_handler(bank->irq, bcm_kona_gpio_irq_handler);
- irq_set_handler_data(bank->irq, bank);
+ irq_set_chained_handler_and_data(bank->irq,
+ bcm_kona_gpio_irq_handler,
+ bank);
}
spin_lock_init(&kona_gpio->lock);