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Tue, 24 Mar 2020 23:05:05 +0000 From: Nicholas Johnson To: Srinivas Kandagatla CC: "gregkh@linuxfoundation.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 3/3] nvmem: core: use is_bin_visible for permissions Thread-Topic: [PATCH 3/3] nvmem: core: use is_bin_visible for permissions Thread-Index: AQHWAf/vktu3KaBaqESPDuw2qu8YI6hYXUiA Date: Tue, 24 Mar 2020 23:05:07 +0000 Message-ID: References: <20200324171600.15606-1-srinivas.kandagatla@linaro.org> <20200324171600.15606-4-srinivas.kandagatla@linaro.org> In-Reply-To: <20200324171600.15606-4-srinivas.kandagatla@linaro.org> Accept-Language: en-AU, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SYBPR01CA0125.ausprd01.prod.outlook.com (2603:10c6:10:5::17) To PSXP216MB0438.KORP216.PROD.OUTLOOK.COM (2603:1096:300:d::20) x-incomingtopheadermarker: OriginalChecksum:6D93BEE9EF95FDD75F1AAE980FBC42F91DA2DF375118E2842B804CC9D483F8D5;UpperCasedChecksum:9FFDE8ED225BCF8A9DE0A9A0C2E79CB141D839E70EA6D5F473FC9E358022B600;SizeAsReceived:7857;Count:50 x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [bsQOyyMCmwJRRSICar1jsaAigu5GB39yeea4vnN6y522H3gx7oRm4cvYxyC9CQYq] x-microsoft-original-message-id: <20200324230459.GA2372@nicholas-dell-linux> x-ms-publictraffictype: Email x-incomingheadercount: 50 x-eopattributedmessage: 0 x-ms-office365-filtering-correlation-id: 10ef63d0-f433-4f44-2bd0-08d7d047cb6a x-ms-traffictypediagnostic: HK2APC01HT138: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 0NhCOWAcPlYcJjtCRpLlILKmVmfePvfjep5OQCuFZLx40+NbH3IU/av7IQ1lArSfOLR5GNALogwX3ul57N+KZMVSomJnhGwL0PhRWJ8YJr1oty9jHyB884AxUgEKvxY1Kl4yn01CgcxyLKSPqylDbhCDJ4LIEfUsfEMBhsz44fxrNGT7KuzVPH8QXAJywh08 x-ms-exchange-antispam-messagedata: PXy851lvXXJkh1bcFI0adP2X5sIEy426EQWh+I1jBO/HsPGJBwmdmPFNyADp+O3/brbu0AgnHR0mNlMbnUcYr7d/Tqfp+aQmk0015O8XfylZAZiSnvXxfI+kGtOXcTPJV2CR4MxjbaGqM/W7bwpHASWzsEqCD+eee4SqMD7lX5/yGXxXS/bgF8V8fsHdod/z7lX4SEdiicWg1JsjunA1kA== x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-ID: <4858EECB40EBC4428222026CFE25EAD5@KORP216.PROD.OUTLOOK.COM> Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 10ef63d0-f433-4f44-2bd0-08d7d047cb6a X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Mar 2020 23:05:08.0018 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: HK2APC01HT138 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 24, 2020 at 05:16:00PM +0000, Srinivas Kandagatla wrote: > By using is_bin_visible callback to set permissions will remove a large list > of attribute groups. These group permissions can be dynamically derived in > the callback. > > Suggested-by: Greg KH > Signed-off-by: Srinivas Kandagatla > --- > drivers/nvmem/nvmem-sysfs.c | 74 +++++++++---------------------------- > 1 file changed, 18 insertions(+), 56 deletions(-) > > diff --git a/drivers/nvmem/nvmem-sysfs.c b/drivers/nvmem/nvmem-sysfs.c > index 8759c4470012..1ff1801048f6 100644 > --- a/drivers/nvmem/nvmem-sysfs.c > +++ b/drivers/nvmem/nvmem-sysfs.c > @@ -103,6 +103,17 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, > > return count; > } > +static umode_t nvmem_bin_attr_is_visible(struct kobject *kobj, > + struct bin_attribute *attr, int i) > +{ > + struct device *dev = container_of(kobj, struct device, kobj); > + struct nvmem_device *nvmem = to_nvmem_device(dev); > + > + if (nvmem->root_only) > + return nvmem->read_only ? 0400 : 0600; > + > + return nvmem->read_only ? 0444 : 0644; > +} Looks like I did a pretty good job as I arrived at a similar result independently. Even added root_only to nvmem_device. You beat me to it. :) > const struct attribute_group **nvmem_sysfs_get_groups( > struct nvmem_device *nvmem, > const struct nvmem_config *config) > { > - if (config->root_only) > - return nvmem->read_only ? > - nvmem_ro_root_dev_groups : > - nvmem_rw_root_dev_groups; > - > - return nvmem->read_only ? nvmem_ro_dev_groups : nvmem_rw_dev_groups; > + return nvmem_dev_groups; > } I was wondering if we can export nvmem_dev_group instead of this nvmem_sysfs_get_groups() to fetch it. Also, we need some logic in nvmem_register() to abort if bad combination is given (i.e. root_only set but no reg_read), as returning 0 in is_bin_visible callback does not abort. I can do that in my patch if you want. Regards, Nicholas > > /* > -- > 2.21.0 >