diff options
| author | Johan Hovold <johan@kernel.org> | 2015-05-04 18:10:30 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-05-12 11:46:40 +0300 |
| commit | 3ff74be5c1a72df6d304dcb453f68e3c3bea3bdd (patch) | |
| tree | 301c70d5cea8d288630022114d213724b953dad6 /drivers/gpio | |
| parent | cecf58ab551f746c1e2b549d90b51a94b442d1e0 (diff) | |
| download | linux-3ff74be5c1a72df6d304dcb453f68e3c3bea3bdd.tar.xz | |
gpio: sysfs: reduce gpiochip-export locking scope
Reduce scope of sysfs_lock protection during chip export and unexport,
which is only needed to prevent gpiod (re-)exports during chip removal.
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-sysfs.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 658ed28e6d7d..d19bf234e878 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -779,7 +779,6 @@ int gpiochip_export(struct gpio_chip *chip) return 0; /* use chip->base for the ID; it's already known to be unique */ - mutex_lock(&sysfs_lock); dev = device_create_with_groups(&gpio_class, chip->dev, MKDEV(0, 0), chip, gpiochip_groups, "gpiochip%d", chip->base); @@ -787,6 +786,8 @@ int gpiochip_export(struct gpio_chip *chip) status = PTR_ERR(dev); else status = 0; + + mutex_lock(&sysfs_lock); chip->exported = (status == 0); mutex_unlock(&sysfs_lock); @@ -803,17 +804,17 @@ void gpiochip_unexport(struct gpio_chip *chip) struct gpio_desc *desc; unsigned int i; - mutex_lock(&sysfs_lock); dev = class_find_device(&gpio_class, NULL, chip, match_export); if (dev) { put_device(dev); device_unregister(dev); /* prevent further gpiod exports */ + mutex_lock(&sysfs_lock); chip->exported = false; + mutex_unlock(&sysfs_lock); status = 0; } else status = -ENODEV; - mutex_unlock(&sysfs_lock); if (status) chip_dbg(chip, "%s: status %d\n", __func__, status); |