From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Since another rename could be running in parallel it is safer to check
that the name is not changing inside the lock, where we already know the
device name will not change.
Fixes: d21943dd19b5 ("RDMA/core: Implement IB device rename function")
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Reviewed-by: Parav Pandit <parav@xxxxxxxxxxxx>
---
drivers/infiniband/core/device.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 55221990d946b2..a7c766cdf28ca4 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -189,12 +189,14 @@ static struct ib_device *__ib_device_get_by_name(const char *name)
int ib_device_rename(struct ib_device *ibdev, const char *name)
{
- int ret = 0;
-
- if (!strcmp(name, dev_name(&ibdev->dev)))
- return ret;
+ int ret;
mutex_lock(&device_mutex);
+ if (!strcmp(name, dev_name(&ibdev->dev))) {
+ ret = 0;
+ goto out;
+ }
+
if (__ib_device_get_by_name(name)) {
ret = -EEXIST;
goto out;
--
2.20.1
