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| author | Andreas Kemnade <andreas@kemnade.info> | 2023-05-04 08:04:21 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-05-17 11:47:14 +0200 |
| commit | 7dd3d9bd873f138675cb727eaa51a498d99f0e89 (patch) | |
| tree | f6c274101f38f291d2c3ee289b9f84c0db41454a /drivers/gpio | |
| parent | 0a1bb16e0fe6650c3841e611de374bfd5578ad70 (diff) | |
| download | lwn-7dd3d9bd873f138675cb727eaa51a498d99f0e89.tar.gz lwn-7dd3d9bd873f138675cb727eaa51a498d99f0e89.zip | |
gpiolib: fix allocation of mixed dynamic/static GPIOs
If static allocation and dynamic allocation GPIOs are present,
dynamic allocation pollutes the numberspace for static allocation,
causing static allocation to fail.
Enforce dynamic allocation above GPIO_DYNAMIC_BASE.
Seen on a GTA04 when omap-gpio (static) and twl-gpio (dynamic)
raced:
[some successful registrations of omap_gpio instances]
[ 2.553833] twl4030_gpio twl4030-gpio: gpio (irq 145) chaining IRQs 161..178
[ 2.561401] gpiochip_find_base: found new base at 160
[ 2.564392] gpio gpiochip5: (twl4030): added GPIO chardev (254:5)
[ 2.564544] gpio gpiochip5: registered GPIOs 160 to 177 on twl4030
[...]
[ 2.692169] omap-gpmc 6e000000.gpmc: GPMC revision 5.0
[ 2.697357] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[ 2.703643] gpiochip_find_base: found new base at 178
[ 2.704376] gpio gpiochip6: (omap-gpmc): added GPIO chardev (254:6)
[ 2.704589] gpio gpiochip6: registered GPIOs 178 to 181 on omap-gpmc
[...]
[ 2.840393] gpio gpiochip7: Static allocation of GPIO base is deprecated, use dynamic allocation.
[ 2.849365] gpio gpiochip7: (gpio-160-191): GPIO integer space overlap, cannot add chip
[ 2.857513] gpiochip_add_data_with_key: GPIOs 160..191 (gpio-160-191) failed to register, -16
[ 2.866149] omap_gpio 48310000.gpio: error -EBUSY: Could not register gpio chip
On that device it is fixed invasively by
commit 92bf78b33b0b4 ("gpio: omap: use dynamic allocation of base")
but let's also fix that for devices where there is still
a mixture of static and dynamic allocation.
Fixes: 7b61212f2a07 ("gpiolib: Get rid of ARCH_NR_GPIOS")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: <christophe.leroy@csgroup.eu>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 04fb05df805b..a7220e04a93e 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -209,6 +209,8 @@ static int gpiochip_find_base(int ngpio) break; /* nope, check the space right after the chip */ base = gdev->base + gdev->ngpio; + if (base < GPIO_DYNAMIC_BASE) + base = GPIO_DYNAMIC_BASE; } if (gpio_is_valid(base)) { |