diff options
| author | David Brownell <dbrownell@users.sourceforge.net> | 2009-04-03 03:57:06 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-03 06:04:51 +0400 |
| commit | 8a0cecffeb52363a57257bbbbd58f4c4537a75bb (patch) | |
| tree | ee7f754d49a2f2ad75b72ec59e90e6fa2c0753eb /drivers/gpio | |
| parent | 926b663ce8215ba448960e1ff6e58b67a2c3b99b (diff) | |
| download | linux-8a0cecffeb52363a57257bbbbd58f4c4537a75bb.tar.xz | |
gpio: gpio_{request,free}() now required (feature removal)
We want to phase out the GPIO "autorequest" mechanism in gpiolib and
require all callers to use gpio_request().
- Update feature-removal-schedule
- Update the documentation now
- Convert the relevant pr_warning() in gpiolib to a WARN()
so folk using this mechanism get a noisy stack dump
Some drivers and board init code will probably need to change.
Implementations not using gpiolib will still be fine; they are already
required to implement gpio_{request,free}() stubs.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 83c3fe3a136b..51a8d4103be5 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -69,20 +69,24 @@ static inline void desc_set_label(struct gpio_desc *d, const char *label) * those calls have no teeth) we can't avoid autorequesting. This nag * message should motivate switching to explicit requests... so should * the weaker cleanup after faults, compared to gpio_request(). + * + * NOTE: the autorequest mechanism is going away; at this point it's + * only "legal" in the sense that (old) code using it won't break yet, + * but instead only triggers a WARN() stack dump. */ static int gpio_ensure_requested(struct gpio_desc *desc, unsigned offset) { - if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { - struct gpio_chip *chip = desc->chip; - int gpio = chip->base + offset; + const struct gpio_chip *chip = desc->chip; + const int gpio = chip->base + offset; + if (WARN(test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0, + "autorequest GPIO-%d\n", gpio)) { if (!try_module_get(chip->owner)) { pr_err("GPIO-%d: module can't be gotten \n", gpio); clear_bit(FLAG_REQUESTED, &desc->flags); /* lose */ return -EIO; } - pr_warning("GPIO-%d autorequested\n", gpio); desc_set_label(desc, "[auto]"); /* caller must chip->request() w/o spinlock */ if (chip->request) |