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gpio: gpio-tegra: 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().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/E1Z4z0M-0002Sl-Ti@rmk-PC.arm.linux.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Russell King 2015-06-16 23:06:50 +01:00 committed by Thomas Gleixner
parent a44735f421
commit e88d251d6a
1 changed files with 2 additions and 2 deletions
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4
drivers/gpio/gpio-tegra.c
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@ -515,8 +515,8 @@ static int tegra_gpio_probe(struct platform_device *pdev)
for (i = 0; i < tegra_gpio_bank_count; i++) {
bank = &tegra_gpio_banks[i];
irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
irq_set_handler_data(bank->irq, bank);
irq_set_chained_handler_and_data(bank->irq,
tegra_gpio_irq_handler, bank);
for (j = 0; j < 4; j++)
spin_lock_init(&bank->lvl_lock[j]);