From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757405AbcDGSy2 (ORCPT ); Thu, 7 Apr 2016 14:54:28 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:12514 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757346AbcDGSyY (ORCPT ); Thu, 7 Apr 2016 14:54:24 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Thu, 07 Apr 2016 11:52:50 -0700 From: Laxman Dewangan To: , , , CC: , , , , "Laxman Dewangan" Subject: [PATCH V2 01/20] mfd: Add resource managed apis for mfd_add_devices Date: Fri, 8 Apr 2016 00:12:55 +0530 Message-ID: <1460054594-32325-2-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1460054594-32325-1-git-send-email-ldewangan@nvidia.com> References: <1460054594-32325-1-git-send-email-ldewangan@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add resource managed API devm_mfd_add_devices() for the mfd_add_devices(). This helps in reducing code in error path as it is not required to call mfd_remove_devices() explicitly to remove all child-devices. In some cases, it also helps not to implement .remove() callback which get called during driver unbind. Signed-off-by: Laxman Dewangan --- Changes from V1: - Reformat the commit message. - Run checkpatch with --strict option and fix warning. - Remove devm_ for mfd_remove_devices() as this is not used. - Consider V1 review comment on error handling. drivers/mfd/mfd-core.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/mfd/core.h | 4 ++++ 2 files changed, 42 insertions(+) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 409da01..4b4c1d4 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -334,6 +334,44 @@ void mfd_remove_devices(struct device *parent) } EXPORT_SYMBOL(mfd_remove_devices); +static void devm_mfd_dev_release(struct device *dev, void *res) +{ + mfd_remove_devices(dev); +} + +/** + * devm_mfd_add_devices - Resource managed version of mfd_add_devices() + * + * Returns 0 on success or an appropriate negative error number on failure. + * All child-devices of the MFD will automatically be removed when it gets + * unbinded. + */ +int devm_mfd_add_devices(struct device *dev, int id, + const struct mfd_cell *cells, int n_devs, + struct resource *mem_base, + int irq_base, struct irq_domain *domain) +{ + struct device **ptr; + int ret; + + ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = mfd_add_devices(dev, id, cells, n_devs, mem_base, + irq_base, domain); + if (ret < 0) { + devres_free(ptr); + return ret; + } + + *ptr = dev; + devres_add(dev, ptr); + + return ret; +} +EXPORT_SYMBOL(devm_mfd_add_devices); + int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) { struct mfd_cell cell_entry; diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h index bc6f7e0..4a0268a 100644 --- a/include/linux/mfd/core.h +++ b/include/linux/mfd/core.h @@ -131,4 +131,8 @@ static inline int mfd_add_hotplug_devices(struct device *parent, extern void mfd_remove_devices(struct device *parent); +extern int devm_mfd_add_devices(struct device *dev, int id, + const struct mfd_cell *cells, int n_devs, + struct resource *mem_base, + int irq_base, struct irq_domain *irq_domain); #endif -- 2.1.4