The patch titled regulator: refcount fixes has been removed from the -mm tree. Its filename was regulator-refcount-fixes.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ 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-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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html