[PATCH] gpio: revert get() to non-errorprogating behaviour

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



commit e20538b82f1ffcc06e68feb117f24f211cff7a4d
"gpio: Propagate errors from chip->get()"
started to propagate errors from the .get() functions since
we can get errors from the infrastructure of e.g. slowbus
GPIO expanders.

However it turns out a bunch of drivers relied on the core
to clamp the value, so we need to revert to the old behaviour
and go over all drivers and fix them to conform to the
expectations of the core before we go back to propagating
the error code.

Cc: stable@xxxxxxxxxxxxxxx
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
Cc: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
Reported-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/gpio/gpiolib.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 2a91f3287e3b..4e4c3083ae56 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1279,7 +1279,13 @@ static int _gpiod_get_raw_value(const struct gpio_desc *desc)
 	chip = desc->chip;
 	offset = gpio_chip_hwgpio(desc);
 	value = chip->get ? chip->get(chip, offset) : -EIO;
-	value = value < 0 ? value : !!value;
+	/*
+	 * FIXME: fix all drivers to clamp to [0,1] or return negative,
+	 * then change this to:
+	 * value = value < 0 ? value : !!value;
+	 * so we can properly propagate error codes.
+	 */
+	value = !!value;
 	trace_gpio_value(desc_to_gpio(desc), 1, value);
 	return value;
 }
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux SPI]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux