net/mlx5: Fix error handling when adding flow rules

[ Upstream commit 9238e380e823a39983ee8d6b6ee8d1a9c4ba8a65 ]

If building match list or adding existing fg fails when
node is locked, function returned without unlocking it.
This happened if node version changed or adding existing fg
returned with EAGAIN after jumping to search_again_locked label.

Fixes: bd71b08ec2ee ("net/mlx5: Support multiple updates of steering rules in parallel")
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index dfaad9ecb2b8f155c5cdf30451c572b2d10f1d37..a681693631aa1a36e42b4e4d1c4c1aef76d4307d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -1755,8 +1755,11 @@ search_again_locked:
 
        /* Collect all fgs which has a matching match_criteria */
        err = build_match_list(&match_head, ft, spec);
-       if (err)
+       if (err) {
+               if (take_write)
+                       up_write_ref_node(&ft->node);
                return ERR_PTR(err);
+       }
 
        if (!take_write)
                up_read_ref_node(&ft->node);
@@ -1765,8 +1768,11 @@ search_again_locked:
                                      dest_num, version);
        free_match_list(&match_head);
        if (!IS_ERR(rule) ||
-           (PTR_ERR(rule) != -ENOENT && PTR_ERR(rule) != -EAGAIN))
+           (PTR_ERR(rule) != -ENOENT && PTR_ERR(rule) != -EAGAIN)) {
+               if (take_write)
+                       up_write_ref_node(&ft->node);
                return rule;
+       }
 
        if (!take_write) {
                nested_down_write_ref_node(&ft->node, FS_LOCK_GRANDPARENT);