[PATCH rdma-next 5/8] RDMA/core: Provide locked variant of device name to index function

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

From: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Add self-contained with locks device name to index function.

Reviewed-by: Mark Bloch <markb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leonro-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
 drivers/infiniband/core/core_priv.h |  1 +
 drivers/infiniband/core/device.c    | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index ded3850721e0..e71dd1814bf0 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -301,6 +301,7 @@ static inline int ib_mad_enforce_security(struct ib_mad_agent_private *map,
 #endif
 
 struct ib_device *__ib_device_get_by_index(u32 ifindex);
+struct ib_device *ib_device_get_by_index(u32 ifindex);
 /* RDMA device netlink */
 void nldev_init(void);
 void nldev_exit(void);
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index cb69357a1909..adf3a4ca038b 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -150,6 +150,22 @@ struct ib_device *__ib_device_get_by_index(u32 index)
 	return NULL;
 }
 
+/*
+ * Caller is responsible to return refrerence count by calling put_device()
+ */
+struct ib_device *ib_device_get_by_index(u32 index)
+{
+	struct ib_device *device;
+
+	down_write(&lists_rwsem);
+	device = __ib_device_get_by_index(index);
+	if (device)
+		get_device(&device->dev);
+
+	up_write(&lists_rwsem);
+	return device;
+}
+
 static struct ib_device *__ib_device_get_by_name(const char *name)
 {
 	struct ib_device *device;
-- 
2.15.1

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