The patch titled
regulator: refcount fixes
has been added to the -mm tree. Its filename is
regulator-refcount-fixes.patch
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------------------------------------------------------
Subject: regulator: refcount fixes
From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Fix some refcounting issues in the regulator framework, supporting
regulator_disable() for regulators that were enabled at boot time via
machine constraints:
- Update those regulators' usecounts after enabling, so they
can cleanly be disabled at that level.
- Remove the problematic per-consumer usecount, so there's
only one level of enable/disable.
Buggy consumers could notice different bug symptoms. The main
example would be refcounting bugs; also, any (out-of-tree) users
of the experimental regulator_set_optimum_mode() stuff which
don't call it when they're done using a regulator.
This is a net minor codeshrink.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Liam Girdwood <lrg@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/regulator/core.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff -puN drivers/regulator/core.c~regulator-refcount-fixes drivers/regulator/core.c
--- a/drivers/regulator/core.c~regulator-refcount-fixes
+++ a/drivers/regulator/core.c
@@ -52,7 +52,6 @@ struct regulator {
int uA_load;
int min_uV;
int max_uV;
- int enabled; /* count of client enables */
char *supply_name;
struct device_attribute dev_attr;
struct regulator_dev *rdev;
@@ -815,6 +814,7 @@ static int set_machine_constraints(struc
rdev->constraints = NULL;
goto out;
}
+ rdev->use_count = 1;
}
print_constraints(rdev);
@@ -1068,10 +1068,6 @@ void regulator_put(struct regulator *reg
mutex_lock(®ulator_list_mutex);
rdev = regulator->rdev;
- if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
- regulator->supply_name))
- _regulator_disable(rdev);
-
/* remove any sysfs entries */
if (regulator->dev) {
sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
@@ -1146,12 +1142,7 @@ int regulator_enable(struct regulator *r
int ret = 0;
mutex_lock(&rdev->mutex);
- if (regulator->enabled == 0)
- ret = _regulator_enable(rdev);
- else if (regulator->enabled < 0)
- ret = -EIO;
- if (ret == 0)
- regulator->enabled++;
+ ret = _regulator_enable(rdev);
mutex_unlock(&rdev->mutex);
return ret;
}
@@ -1162,6 +1153,11 @@ static int _regulator_disable(struct reg
{
int ret = 0;
+ if (WARN(rdev->use_count <= 0,
+ "unbalanced disables for %s\n",
+ rdev->desc->name))
+ return -EIO;
+
/* are we the last user and permitted to disable ? */
if (rdev->use_count == 1 && !rdev->constraints->always_on) {
@@ -1210,16 +1206,7 @@ int regulator_disable(struct regulator *
int ret = 0;
mutex_lock(&rdev->mutex);
- if (regulator->enabled == 1) {
- ret = _regulator_disable(rdev);
- if (ret == 0)
- regulator->uA_load = 0;
- } else if (WARN(regulator->enabled <= 0,
- "unbalanced disables for supply %s\n",
- regulator->supply_name))
- ret = -EIO;
- if (ret == 0)
- regulator->enabled--;
+ ret = _regulator_disable(rdev);
mutex_unlock(&rdev->mutex);
return ret;
}
@@ -1266,7 +1253,6 @@ int regulator_force_disable(struct regul
int ret;
mutex_lock(®ulator->rdev->mutex);
- regulator->enabled = 0;
regulator->uA_load = 0;
ret = _regulator_force_disable(regulator->rdev);
mutex_unlock(®ulator->rdev->mutex);
_
Patches currently in -mm which might be from dbrownell@xxxxxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
nand-fix-raw-reads-with-ecc-syndrome-layouts.patch
nand-davinci_nand-driver.patch
nand-fix-broken-debug-messages.patch
mtd-we-dont-need-no-misc-devices.patch
mtd-partitioning-utility-predicates.patch
regulator-refcount-fixes.patch
regulator-init-fixes.patch
blackfin-spi-driver-fix-erroneous-spi-clock-divisor-calculation.patch
blackfin-spi-driver-remove-useless-asm-cplbinith.patch
blackfin-spi-driver-use-len_in_bytes-when-we-care-about-the-number-of-bytes-transferred.patch
blackfin-spi-driver-pass-dma-overflow-error-to-the-higher-level.patch
blackfin-spi-driver-unify-duplicated-code-in-dma-read-write-paths.patch
blackfin-spi-driver-drop-bogus-cast-and-touchup-dma-label.patch
blackfin-spi-driver-get-dma-working-for-spi-flashes.patch
blackfin-spi-driver-fix-bug-spi-controller-driver-does-not-assert-deassert-cs-correctly.patch
blackfin-spi-driver-fix-bug-correct-usage-of-struct-spi_transfercs_change.patch
spi-limit-reaches-1-tested-0.patch
rtc-ds1307-true-smbus-compatibility.patch
gpio-gpio_requestfree-now-required-feature-removal.patch
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