Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754871AbZCLAns (ORCPT ); Wed, 11 Mar 2009 20:43:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753170AbZCLAni (ORCPT ); Wed, 11 Mar 2009 20:43:38 -0400 Received: from smtp128.sbc.mail.sp1.yahoo.com ([69.147.65.187]:33903 "HELO smtp128.sbc.mail.sp1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752497AbZCLAnh (ORCPT ); Wed, 11 Mar 2009 20:43:37 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=pacbell.net; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:User-Agent:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=fpFX3uS/ONFR3oVdYgPaw5x91fMYAtdbqeuR9tonPZNq8OJ4vlprhPWptbKUVgDnlTpRXiIh/751lDVHNCOU3NDcU3a0ukSunKae8nMuE6efpv1w9ZGiNsWxjuYEOq22kSXdwVFjJ5pJTHRTUqXczCm3r1C9cdkm/Xy5gTAP2r4= ; X-YMail-OSG: tocdeEIVM1lNLM0x2DWzMDmh39FkxKoIWiVG4n6U97Icys3b1CiYCcaNIWJ0JdwIYNrwyipJCsHtbXqEUt.m.O54h3nU74IsjO_kQ5Fofc_D.G4cUbYjeVDieZ6YgDoxe0WOSPTarw3w18p1FSVbO6x2nExW0xE2Bm1la0wpHHWKk4fa2FalZA-- X-Yahoo-Newman-Property: ymail-3 From: David Brownell To: Liam Girdwood , Mark Brown Subject: [patch 2.6.29-rc7 regulator-next] regulator: refcount fixes Date: Wed, 11 Mar 2009 16:43:34 -0800 User-Agent: KMail/1.9.10 Cc: lkml , OMAP MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200903111743.34708.david-b@pacbell.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3403 Lines: 112 From: David Brownell 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 --- Against the regulator-next tree; mainline has similar issues. drivers/regulator/core.c | 30 ++++++++---------------------- 1 file changed, 8 insertions(+), 22 deletions(-) --- a/drivers/regulator/core.c +++ b/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; @@ -811,6 +810,7 @@ static int set_machine_constraints(struc rdev->constraints = NULL; goto out; } + rdev->use_count = 1; } print_constraints(rdev); @@ -1066,10 +1066,6 @@ 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); @@ -1144,12 +1140,7 @@ 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; } @@ -1160,6 +1151,11 @@ 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) { @@ -1208,16 +1204,7 @@ 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; } @@ -1264,7 +1251,6 @@ 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/