From 87068309300c707d659ce79232eae827604804a4 Mon Sep 17 00:00:00 2001 From: Sergio Paracuellos Date: Fri, 20 Mar 2020 12:01:23 +0100 Subject: [PATCH] staging: mt7621-pci: be sure gpio descriptor is null on fails 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 Link: https://lore.kernel.org/r/20200320110123.9907-6-sergio.paracuellos@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/mt7621-pci/pci-mt7621.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/staging/mt7621-pci/pci-mt7621.c +++ b/drivers/staging/mt7621-pci/pci-mt7621.c @@ -363,8 +363,10 @@ static int mt7621_pcie_parse_port(struct 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;