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[PATCH 4.9 022/152] ACPI / gpio: do not fall back to parsing _CRS when we get a deferral

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  [PATCH 4.9 022/152] ACPI / gpio: do not fall back to parsing _CRS when we get a deferral Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-04-10 18:50 +0200

#1620254 — [PATCH 4.9 022/152] ACPI / gpio: do not fall back to parsing _CRS when we get a deferral

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit 693bdaa164b40b7aa6018b98af6f7e40dbd52457 upstream.

If, while locating GPIOs by name, we get probe deferral, we should
immediately report it to caller rather than trying to fall back to parsing
unnamed GPIOs from _CRS block.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-and-Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpio/gpiolib-acpi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -571,8 +571,10 @@ struct gpio_desc *acpi_find_gpio(struct
 		}
 
 		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
-		if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
+		if (!IS_ERR(desc))
 			break;
+		if (PTR_ERR(desc) == -EPROBE_DEFER)
+			return ERR_CAST(desc);
 	}
 
 	/* Then from plain _CRS GPIOs */

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