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staging: mt7621-pci: be sure gpio descriptor is null on fails

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Function 'devm_gpiod_get_index_optional' returns NULL if the
descriptor is invalid and the error associated for the error
pointer is ENOENT. Sometimes if the pin is just assigned the
error associated for the pointer might not be ENOENT but other.
In order to avoid weirds behaviours if this happen set descriptor
to NULL in the driver port structure.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20200320110123.9907-6-sergio.paracuellos@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergio Paracuellos 2020-03-20 12:01:23 +01:00 committed by Greg Kroah-Hartman
parent 7846a98285
commit 825c6f470c
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/mt7621-pci/pci-mt7621.c
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@ -363,8 +363,10 @@ static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
GPIOD_OUT_LOW);
if (IS_ERR(port->gpio_rst))
if (IS_ERR(port->gpio_rst)) {
dev_notice(dev, "Failed to get GPIO for PCIe%d\n", slot);
port->gpio_rst = NULL;
}
port->slot = slot;
port->pcie = pcie;