Messages in this thread Patch in this message | | | Date | Thu, 18 Jun 2015 05:07:42 -0700 | From | tip-bot for Russell King <> | Subject | [tip:irq/core] gpio: gpio-mxc: Fix race in installing chained IRQ handler |
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Commit-ID: e65eea54e98566de2cbb10e710873bc5e34c6680 Gitweb: http://git.kernel.org/tip/e65eea54e98566de2cbb10e710873bc5e34c6680 Author: Russell King <rmk+kernel@arm.linux.org.uk> AuthorDate: Tue, 16 Jun 2015 23:06:40 +0100 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Thu, 18 Jun 2015 14:03:08 +0200
gpio: gpio-mxc: 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/E1Z4z0C-0002SX-Lj@rmk-PC.arm.linux.org.uk Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- drivers/gpio/gpio-mxc.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c index 9f7446a..e4f42c9 100644 --- a/drivers/gpio/gpio-mxc.c +++ b/drivers/gpio/gpio-mxc.c @@ -437,14 +437,13 @@ static int mxc_gpio_probe(struct platform_device *pdev) irq_set_chained_handler(port->irq, mx2_gpio_irq_handler); } else { /* setup one handler for each entry */ - irq_set_chained_handler(port->irq, mx3_gpio_irq_handler); - irq_set_handler_data(port->irq, port); - if (port->irq_high > 0) { + irq_set_chained_handler_and_data(port->irq, + mx3_gpio_irq_handler, port); + if (port->irq_high > 0) /* setup handler for GPIO 16 to 31 */ - irq_set_chained_handler(port->irq_high, - mx3_gpio_irq_handler); - irq_set_handler_data(port->irq_high, port); - } + irq_set_chained_handler_and_data(port->irq_high, + mx3_gpio_irq_handler, + port); } err = bgpio_init(&port->bgc, &pdev->dev, 4,
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