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

Leon Romanovsky
2017-12-24T13:43:25Z

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;