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Wysocki" , Greg Kroah-Hartman Subject: [PATCH v10 1/5] driver core: Delete the link between two given devices Date: Wed, 14 Mar 2018 13:44:30 +0530 Message-Id: <20180314081434.30875-2-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 2.16.1.72.g5be1f00a9a70 In-Reply-To: <20180314081434.30875-1-vivek.gautam@codeaurora.org> References: <20180314081434.30875-1-vivek.gautam@codeaurora.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594900136386574050?= X-GMAIL-MSGID: =?utf-8?q?1594900136386574050?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Given the consumer and supplier devices, add an API to delete the link between them. Suggested-by: Tomasz Figa Signed-off-by: Vivek Gautam Cc: Rafael J. Wysocki Cc: Greg Kroah-Hartman --- - This patch replaces an earlier patch [1] that was adding device_link_find() API. [1] https://patchwork.kernel.org/patch/10277975/ drivers/base/core.c | 31 +++++++++++++++++++++++++++++++ include/linux/device.h | 1 + 2 files changed, 32 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 5847364f25d9..e13d904e1e12 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -336,6 +336,37 @@ void device_link_del(struct device_link *link) } EXPORT_SYMBOL_GPL(device_link_del); +/** + * device_link_del_dev - Delete a link between two given devices + * @consumer: Consumer end of the link. + * @supplier: Supplier end of the link. + * + * The caller must ensure proper synchronization of this function with runtime + * PM. + */ +void device_link_del_dev(struct device *consumer, struct device *supplier) +{ + struct device_link *link; + + if (!consumer || !supplier) + return; + + device_links_write_lock(); + device_pm_lock(); + + list_for_each_entry(link, &supplier->links.consumers, s_node) { + if (link->consumer == consumer) { + __device_link_del(link); + /* just one link between the devices */ + break; + } + } + + device_pm_unlock(); + device_links_write_unlock(); +} +EXPORT_SYMBOL_GPL(device_link_del_dev); + static void device_links_missing_supplier(struct device *dev) { struct device_link *link; diff --git a/include/linux/device.h b/include/linux/device.h index b093405ed525..14508d843f67 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1278,6 +1278,7 @@ extern const char *dev_driver_string(const struct device *dev); struct device_link *device_link_add(struct device *consumer, struct device *supplier, u32 flags); void device_link_del(struct device_link *link); +void device_link_del_dev(struct device *consumer, struct device *supplier); #ifdef CONFIG_PRINTK -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation