| Message ID | 20231207075835.3091694-1-r.czerwinski@pengutronix.de |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] net: rfkill: gpio: set GPIO direction | expand |
On Thu, Dec 07, 2023 at 08:58:36AM +0100, Rouven Czerwinski wrote: > Fix the undefined usage of the GPIO consumer API after retrieving the > GPIO description with GPIO_ASIS. The API documentation mentions that > GPIO_ASIS won't set a GPIO direction and requires the user to set a > direction before using the GPIO. > > This can be confirmed on i.MX6 hardware, where rfkill-gpio is no longer > able to enabled/disable a device, presumably because the GPIO controller > was never configured for the output direction. > > Fixes: b2f750c3a80b ("net: rfkill: gpio: prevent value glitch during probe") > Cc: stable@vger.kernel.org > Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de> Reviewed-by: Simon Horman <horms@kernel.org>
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c index 5a81505fba9ac..4e32d659524e0 100644 --- a/net/rfkill/rfkill-gpio.c +++ b/net/rfkill/rfkill-gpio.c @@ -126,6 +126,14 @@ static int rfkill_gpio_probe(struct platform_device *pdev) return -EINVAL; } + ret = gpiod_direction_output(rfkill->reset_gpio, true); + if (ret) + return ret; + + ret = gpiod_direction_output(rfkill->shutdown_gpio, true); + if (ret) + return ret; + rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, rfkill->type, &rfkill_gpio_ops, rfkill);
Fix the undefined usage of the GPIO consumer API after retrieving the GPIO description with GPIO_ASIS. The API documentation mentions that GPIO_ASIS won't set a GPIO direction and requires the user to set a direction before using the GPIO. This can be confirmed on i.MX6 hardware, where rfkill-gpio is no longer able to enabled/disable a device, presumably because the GPIO controller was never configured for the output direction. Fixes: b2f750c3a80b ("net: rfkill: gpio: prevent value glitch during probe") Cc: stable@vger.kernel.org Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de> --- v2: - remove the if clauses, the gpiod_direction_* functions can handle NULL gpio descriptors. net/rfkill/rfkill-gpio.c | 8 ++++++++ 1 file changed, 8 insertions(+) base-commit: 994d5c58e50e91bb02c7be4a91d5186292a895c8