[PATCH rdma-next v2 1/4] RDMA/core: Change rdma_get_gid_attr returned error code

[Leon Romanovsky <leon@kernel.org>]

From: Avihai Horon <avihaih@nvidia.com>

Change the error code returned from rdma_get_gid_attr when the GID entry
is invalid but the GID index is in the gid table size range to -ENODATA
instead of -EINVAL.

This change is done in order to provide a more accurate error reporting
to be used by the new GID query API in user space. Nevertheless, -EINVAL
is still returned from sysfs in the aforementioned case to maintain
compatibility with user space that expects -EINVAL.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/core/cache.c | 2 +-
 drivers/infiniband/core/sysfs.c | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index ffad73bb40ff..6079f1f7e678 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -1220,7 +1220,7 @@ EXPORT_SYMBOL(ib_get_cached_port_state);
 const struct ib_gid_attr *
 rdma_get_gid_attr(struct ib_device *device, u8 port_num, int index)
 {
-	const struct ib_gid_attr *attr = ERR_PTR(-EINVAL);
+	const struct ib_gid_attr *attr = ERR_PTR(-ENODATA);
 	struct ib_gid_table *table;
 	unsigned long flags;
 
diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index c11e50510e49..409675d48614 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -387,7 +387,8 @@ static ssize_t _show_port_gid_attr(
 
 	gid_attr = rdma_get_gid_attr(p->ibdev, p->port_num, tab_attr->index);
 	if (IS_ERR(gid_attr))
-		return PTR_ERR(gid_attr);
+		/* -EINVAL is returned for user space compatibility reasons. */
+		return -EINVAL;
 
 	ret = print(gid_attr, buf);
 	rdma_put_gid_attr(gid_attr);
-- 
2.26.2