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Subject[PATCH v10 1/5] driver core: Delete the link between two given devices
Date
Given the consumer and supplier devices, add an API to
delete the link between them.

Suggested-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

- 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
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