4.9-stable review patch. If anyone has any objections, please let me know.
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From: Parav Pandit parav@mellanox.com
commit a840c93ca7582bb6c88df2345a33f979b7a67874 upstream.
When a GID entry is invalid EAGAIN is returned. This is an incorrect error code, there is nothing that will make this GID entry valid again in bounded time.
Some user space tools fail incorrectly if EAGAIN is returned here, and this represents a small ABI change from earlier kernels.
The first patch in the Fixes list makes entries that were valid before to become invalid, allowing this code to trigger, while the second patch in the Fixes list introduced the wrong EAGAIN.
Therefore revert the return result to EINVAL which matches the historical expectations of the ibv_query_gid_type() API of the libibverbs user space library.
Cc: stable@vger.kernel.org Fixes: 598ff6bae689 ("IB/core: Refactor GID modify code for RoCE") Fixes: 03db3a2d81e6 ("IB/core: Add RoCE GID table management") Reviewed-by: Daniel Jurgens danielj@mellanox.com Signed-off-by: Parav Pandit parav@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/core/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -437,7 +437,7 @@ static int __ib_cache_gid_get(struct ib_ return -EINVAL;
if (table->data_vec[index].props & GID_TABLE_ENTRY_INVALID) - return -EAGAIN; + return -EINVAL;
memcpy(gid, &table->data_vec[index].gid, sizeof(*gid)); if (attr) {