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Message-Id: <20200331085427.596028836@linuxfoundation.org>
Date: Tue, 31 Mar 2020 10:58:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Brian Masney <masneyb@...tation.org>,
Hans Verkuil <hans.verkuil@...co.com>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 5.4 083/155] gpiolib: Fix irq_disable() semantics
From: Linus Walleij <linus.walleij@...aro.org>
commit 8959b304c7062889b1276092cc8590dc1ba98f65 upstream.
The implementation if .irq_disable() which kicks in between
the gpiolib and the driver is not properly mimicking the
expected semantics of the irqchip core: the irqchip will
call .irq_disable() if that exists, else it will call
mask_irq() which first checks if .irq_mask() is defined
before calling it.
Since we are calling it unconditionally, we get this bug
from drivers/pinctrl/qcom/pinctrl-ssbi-gpio.c, as it only
defines .irq_mask_ack and not .irq_mask:
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = (ptrval)
(...)
PC is at 0x0
LR is at gpiochip_irq_disable+0x20/0x30
Fix this by only calling .irq_mask() if it exists.
Cc: Brian Masney <masneyb@...tation.org>
Cc: Hans Verkuil <hans.verkuil@...co.com>
Cc: stable@...r.kernel.org
Reviewed-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Fixes: 461c1a7d4733 ("gpiolib: override irq_enable/disable")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Link: https://lore.kernel.org/r/20200306132326.1329640-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpio/gpiolib.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2194,9 +2194,16 @@ static void gpiochip_irq_disable(struct
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ /*
+ * Since we override .irq_disable() we need to mimic the
+ * behaviour of __irq_disable() in irq/chip.c.
+ * First call .irq_disable() if it exists, else mimic the
+ * behaviour of mask_irq() which calls .irq_mask() if
+ * it exists.
+ */
if (chip->irq.irq_disable)
chip->irq.irq_disable(d);
- else
+ else if (chip->irq.chip->irq_mask)
chip->irq.chip->irq_mask(d);
gpiochip_disable_irq(chip, d->hwirq);
}
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