From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756010AbdCXUKS (ORCPT ); Fri, 24 Mar 2017 16:10:18 -0400 Received: from mail-pg0-f47.google.com ([74.125.83.47]:35777 "EHLO mail-pg0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751372AbdCXUKM (ORCPT ); Fri, 24 Mar 2017 16:10:12 -0400 From: Matthias Kaehlcke To: Liam Girdwood , Mark Brown , Javier Martinez Canillas Cc: linux-kernel@vger.kernel.org, Douglas Anderson , Brian Norris , Matthias Kaehlcke Subject: [PATCH] regulator: core: Limit propagation of parent voltage count and list Date: Fri, 24 Mar 2017 13:09:52 -0700 Message-Id: <20170324200952.103303-1-mka@chromium.org> X-Mailer: git-send-email 2.12.1.578.ge9c3154ca4-goog Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 26988efe11b1 ("regulator: core: Allow to get voltage count and list from parent") introduces the propagation of the parent voltage count and list for regulators that don't provide this information themselves. The goal is to support simple switch regulators, however as a side effect normal continuous regulators can leak details of their supplies and provide consumers with inconsistent information. Limit the propagation of the voltage count and list to regulators which don't have get_voltage(_sel) and list_voltage ops. Signed-off-by: Matthias Kaehlcke --- drivers/regulator/core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 53d4fc70dbd0..121838e0125b 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2487,6 +2487,10 @@ static int _regulator_list_voltage(struct regulator *regulator, if (lock) mutex_unlock(&rdev->mutex); } else if (rdev->supply) { + // Limit propagation of parent values to switch regulators + if (ops->get_voltage || ops->get_voltage_sel) + return -EINVAL; + ret = _regulator_list_voltage(rdev->supply, selector, lock); } else { return -EINVAL; @@ -2540,6 +2544,7 @@ EXPORT_SYMBOL_GPL(regulator_is_enabled); int regulator_count_voltages(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; + const struct regulator_ops *ops = rdev->desc->ops; if (rdev->desc->n_voltages) return rdev->desc->n_voltages; @@ -2547,6 +2552,10 @@ int regulator_count_voltages(struct regulator *regulator) if (!rdev->supply) return -EINVAL; + // Limit propagation of parent value to switch regulators + if (ops->get_voltage || ops->get_voltage_sel || ops->list_voltage) + return -EINVAL; + return regulator_count_voltages(rdev->supply); } EXPORT_SYMBOL_GPL(regulator_count_voltages); -- 2.12.1.578.ge9c3154ca4-goog