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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-04-02 16:57:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:04:51 -0700
commit8a0cecffeb52363a57257bbbbd58f4c4537a75bb (patch)
treeee7f754d49a2f2ad75b72ec59e90e6fa2c0753eb /drivers/gpio
parent926b663ce8215ba448960e1ff6e58b67a2c3b99b (diff)
downloadop-kernel-dev-8a0cecffeb52363a57257bbbbd58f4c4537a75bb.zip
op-kernel-dev-8a0cecffeb52363a57257bbbbd58f4c4537a75bb.tar.gz
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.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 83c3fe3..51a8d41 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)
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