From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Add comment and run time check to the __ib_device_get_by_index()
function to remind that the caller should hold lists_rwsem semaphore.
Cc: <stable@xxxxxxxxxxxxxxx> # v4.13
Fixes: ecc82c53f9a4 ("RDMA/core: Add and expose static device index")
Reviewed-by: Mark Bloch <markb@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/device.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 30914f3baa5f..3aeaf11d0a83 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -134,10 +134,15 @@ static int ib_device_check_mandatory(struct ib_device *device)
return 0;
}
+/*
+ * Caller to this function should hold lists_rwsem
+ */
struct ib_device *__ib_device_get_by_index(u32 index)
{
struct ib_device *device;
+ WARN_ON_ONCE(!rwsem_is_locked(&lists_rwsem));
+
list_for_each_entry(device, &device_list, core_list)
if (device->index == index)
return device;
@@ -526,8 +531,8 @@ int ib_register_device(struct ib_device *device,
if (!add_client_context(device, client) && client->add)
client->add(device);
- device->index = __dev_new_index();
down_write(&lists_rwsem);
+ device->index = __dev_new_index();
list_add_tail(&device->core_list, &device_list);
up_write(&lists_rwsem);
mutex_unlock(&device_mutex);
--
2.15.1
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