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Wed, 17 Jul 2019 14:14:56 +0000 (GMT) X-AuditID: cbfec7f4-113ff70000001119-ae-5d2f2d60d555 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id CB.80.04140.06D2F2D5; Wed, 17 Jul 2019 15:14:56 +0100 (BST) Received: from [106.120.51.18] (unknown [106.120.51.18]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20190717141455eusmtip1dd79072acb7a012c06e6ad5b0825b8a2~yN12UtBET2565325653eusmtip1H; Wed, 17 Jul 2019 14:14:55 +0000 (GMT) Subject: Re: [PATCH v2 1/4] opp: core: add regulators enable and disable To: Viresh Kumar From: Kamil Konieczny Message-ID: <237a3f15-7a44-01ce-5477-be94092295ec@partner.samsung.com> Date: Wed, 17 Jul 2019 16:14:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190716100539.4uqelbxqz7bmtmea@vireshk-i7> Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTURzHPbv37l5Hq+PU/JVhMRBMUSuiTk8KLG4PwqCiB6IrL1o+2Zxm QZmllmlqD3RLpqWVmJaPUrPSsuUIX4gyHxUNp1mWUTrBIiznNfK/z/n9Pr9zfl84HKX4xCzm jkfHCepoVaRSKqNrmn+2+4b4+getyH69gVTmPWRIj22YIQXGdoZkWb9QpKOjgiVtyV9ZUmU1 M6SrPl9KxjONiOR1NEhIufE9S+70dErI23MlUvJ1sk1CUp4bWTJlrqRJ5QRPqi3N0i0KvsxQ hviq0ktS/p35mZSvLj7LX3lUinhTb62EH6/yCGQPyzaGCpHH4wW1/+YQWfhor46OTXM9ef7J BJuEfuB05MgBXg1ZDzKQnRW4BMHHbI90JJtmG4LLTROs2BhH8PvDmn8DxW0GRpTuIdCPdM8e RhGU97yU2i1nzIOpe3iaOc4Fe8PnPsHuUPgnDRVdlTO3SvFaGKhtldhZjrdDkjllZpbGnpBb NDzjuOKDMGZ5xYiOE7zRDdJ2dsTroCHXPMMUdoP+wQKJyEuhdjSfsj8GOIeDX521tLh2ADR+ n2JEdoYR0yNW5CXQci1j1kmAoVtXWHH4AgJL2o/ZxgZ4Zepk7GkovBwe1vuL5a1w9eZdZC8D ng+9o07iDvPhak0uJZblcDFVIdq+YPjTOruBO6T/ecBkI6V+TjL9nDT6OWn0/98tRHQpchO0 mqgwQbMqWkjw06iiNNroML9jMVFVaPr/tUyZbHWo/vfRJoQ5pJwnT1rmH6RgVPGaxKgmBByl dJFvmvAJUshDVYmnBHVMsFobKWiakDtHK93kpx0sRxQ4TBUnRAhCrKD+15VwjouT0IH+Hfm7 87rPb9OWmZ569w/lLpF5ZmSl9oUsHNy1z7D3cXq1S841S/KhCssRsHX0e714ur5v8nHhWmve 9W0D3TbvnbrN3wTdyNIYh5xS3aaA/daFjXFOEdqaujNxCRLh9JexE7FjYUqj833rnswS/aJT 45NeJTKXRcFFqT43FtxuDlTSmnDVSm9KrVH9BaPPjJ97AwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrDIsWRmVeSWpSXmKPExsVy+t/xu7oJuvqxBo9WSVlsnLGe1eL6l+es FvOPnGO16H/8mtni/PkN7BZnm96wW2x6fI3V4vKuOWwWn3uPMFrMOL+PyWLtkbvsFkuvX2Sy uN24gs3izY+zTBate4+wW/y7tpHFYuNXD4vND46xOQh5rJm3htFj06pONo871/aweWxeUu/R t2UVo8fxG9uZPD5vkgtgj9KzKcovLUlVyMgvLrFVija0MNIztLTQMzKx1DM0No+1MjJV0rez SUnNySxLLdK3S9DLeHtjJktBu2hF886v7A2MHwW6GDk5JARMJJacnccKYgsJLGWU2PhNCCIu LdF4ejUThC0s8edaF1sXIxdQzWtGieW/Z4I1CAt4SBy/8hwowcEhIqAl8fJmKkgNs8BvFon9 C89DNTQwSbzcNoEZpIFNwFzi0fYzYFN5BdwkGq61soHYLAKqEtMXP2cHsUUFIiQO75jFCFEj KHFy5hMWEJtTwFJi3/RrYDazgLrEn3mXmCFscYlbT+YzQdjyEtvfzmGewCg0C0n7LCQts5C0 zELSsoCRZRWjSGppcW56brGRXnFibnFpXrpecn7uJkZgzG879nPLDsaud8GHGAU4GJV4eG8o 6ccKsSaWFVfmHmKU4GBWEuG1/aodK8SbklhZlVqUH19UmpNafIjRFOi5icxSosn5wHSUVxJv aGpobmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qBcZbPs/c/3HJa8j3vOPm+ No7be7T93LkuXlutTqO+XhMmlo47c6+lf+x6U2OZaXlIt3uKlKnFEr5Zl2qye1NWXTL/GBhT FW/WKTdTZLXVydm3D++wWbc+hutk8fT5PxY09LhcWFh8+X5iQFyXrI16oI5B8sq3bELLbD+5 vZzQpRe5mVv15L2pSizFGYmGWsxFxYkAmjqHig8DAAA= X-CMS-MailID: 20190717141456eucas1p188c4893c75ce04a9c1c10d41ecd9eef5 X-Msg-Generator: CA X-RootMTR: 20190715120430eucas1p19dddcc93756e6a110d3476229f9428b3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20190715120430eucas1p19dddcc93756e6a110d3476229f9428b3 References: <20190715120416.3561-1-k.konieczny@partner.samsung.com> <20190715120416.3561-2-k.konieczny@partner.samsung.com> <20190716100539.4uqelbxqz7bmtmea@vireshk-i7> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190717_071500_189964_3273B87E X-CRM114-Status: GOOD ( 24.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Nishanth Menon , linux-samsung-soc@vger.kernel.org, Rob Herring , linux-arm-kernel@lists.infradead.org, Bartlomiej Zolnierkiewicz , Stephen Boyd , Viresh Kumar , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Chanwoo Choi , Kyungmin Park , Kukjin Kim , MyungJoo Ham , devicetree@vger.kernel.org, Marek Szyprowski Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 16.07.2019 12:05, Viresh Kumar wrote: > On 15-07-19, 14:04, Kamil Konieczny wrote: >> Add enable regulators to dev_pm_opp_set_regulators() and disable >> regulators to dev_pm_opp_put_regulators(). This prepares for >> converting exynos-bus devfreq driver to use dev_pm_opp_set_rate(). >> >> Signed-off-by: Kamil Konieczny >> -- >> Changes in v2: >> >> - move regulator enable and disable into loop >> >> --- >> drivers/opp/core.c | 18 +++++++++++++++--- >> 1 file changed, 15 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/opp/core.c b/drivers/opp/core.c >> index 0e7703fe733f..069c5cf8827e 100644 >> --- a/drivers/opp/core.c >> +++ b/drivers/opp/core.c >> @@ -1570,6 +1570,10 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, >> goto free_regulators; >> } >> >> + ret = regulator_enable(reg); >> + if (ret < 0) >> + goto disable; > > The name of this label is logically incorrect because we won't disable > the regulator from there but put it. Over that, I would rather prefer > to remove the label and add regulator_put() here itself. I will change this and following according to your suggestions and will send v3. >> + >> opp_table->regulators[i] = reg; >> } >> >> @@ -1582,9 +1586,15 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, >> >> return opp_table; >> >> +disable: >> + regulator_put(reg); >> + --i; >> + >> free_regulators: >> - while (i != 0) >> - regulator_put(opp_table->regulators[--i]); >> + for (; i >= 0; --i) { >> + regulator_disable(opp_table->regulators[i]); >> + regulator_put(opp_table->regulators[i]); > > This is incorrect as this will now try to put/disable the regulator > which we failed to acquire. As --i happens only after the loop has run > once. You can rather do: > > while (i--) { > regulator_disable(opp_table->regulators[i]); > regulator_put(opp_table->regulators[i]); > } > > >> + } >> >> kfree(opp_table->regulators); >> opp_table->regulators = NULL; >> @@ -1610,8 +1620,10 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) >> /* Make sure there are no concurrent readers while updating opp_table */ >> WARN_ON(!list_empty(&opp_table->opp_list)); >> >> - for (i = opp_table->regulator_count - 1; i >= 0; i--) >> + for (i = opp_table->regulator_count - 1; i >= 0; i--) { >> + regulator_disable(opp_table->regulators[i]); >> regulator_put(opp_table->regulators[i]); >> + } >> >> _free_set_opp_data(opp_table); >> >> -- >> 2.22.0 > -- Best regards, Kamil Konieczny Samsung R&D Institute Poland _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel