From: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
To: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: barebox@lists.infradead.org
Subject: [PATCH v2 2/6] gpio: Return -EPROBE_DEFER on gpio_get_num()
Date: Wed, 15 Apr 2015 00:53:16 +0200 [thread overview]
Message-ID: <1429052000-20647-3-git-send-email-sebastian.hesselbarth@gmail.com> (raw)
In-Reply-To: <1429052000-20647-1-git-send-email-sebastian.hesselbarth@gmail.com>
GPIO drivers can be registered quite late in registration process
causing dependant devices to fail probing. If we know gpio_get_num
will be called with a non-NULL device, return -EPROBE_DEFER instead
of -ENODEV to allow re-probing later.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
---
Changelog:
v1->v2:
- none
Cc: barebox@lists.infradead.org
---
drivers/gpio/gpiolib.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 611e41ea5606..1f57c76ec16d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -292,12 +292,15 @@ int gpio_get_num(struct device_d *dev, int gpio)
{
struct gpio_chip *chip;
+ if (!dev)
+ return -ENODEV;
+
list_for_each_entry(chip, &chip_list, list) {
if (chip->dev == dev)
return chip->base + gpio;
}
- return -ENODEV;
+ return -EPROBE_DEFER;
}
#ifdef CONFIG_CMD_GPIO
--
2.1.0
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next prev parent reply other threads:[~2015-04-14 22:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-14 22:53 [PATCH v2 0/6] Introduce deferred probing Sebastian Hesselbarth
2015-04-14 22:53 ` [PATCH v2 1/6] base: " Sebastian Hesselbarth
2015-04-14 22:53 ` Sebastian Hesselbarth [this message]
2015-04-14 22:53 ` [PATCH v2 3/6] OF: gpio: Silence error message on -EPROBE_DEFER Sebastian Hesselbarth
2015-04-14 22:53 ` [PATCH v2 4/6] led: gpio: Properly deal with deferred probing Sebastian Hesselbarth
2015-04-14 22:53 ` [PATCH v2 5/6] led: gpio: Free GPIOs on unregister() Sebastian Hesselbarth
2015-04-14 22:53 ` [PATCH v2 6/6] gpio: orion: Convert to platform_driver Sebastian Hesselbarth
2015-04-17 5:24 ` [PATCH v2 0/6] Introduce deferred probing Sascha Hauer
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