From b34cc62084e8c44f7c85e95bfc19e21d07f25173 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sun, 21 Jun 2015 20:16:04 +0200 Subject: [PATCH] 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 Signed-off-by: Thomas Gleixner Cc: Julia Lawall Cc: Ray Jui Cc: Linus Walleij Cc: Alexandre Courbot Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-gpio@vger.kernel.org --- drivers/gpio/gpio-bcm-kona.c | 5 +++-- 1 file 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);