[PATCH 5.4 0/5] CIFS DFS fixes for 5.4

[Rishabh Bhatnagar]

We are seeing deadlock in cifs code while updating volume in
cifs_reconnect. There are few fixes available in stable trees
already. This series backports some patches back to 5.4 stable.

 __schedule+0x268/0x6e0
 schedule+0x2f/0xa0
 schedule_preempt_disabled+0xa/0x10
 __mutex_lock.isra.7+0x20b/0x470
 ? dfs_cache_update_vol+0x45/0x2a0 [cifs]
 dfs_cache_update_vol+0x45/0x2a0 [cifs]
 cifs_reconnect+0x6f2/0xef0 [cifs]
 cifs_handle_standard+0x18d/0x1b0 [cifs]
 cifs_demultiplex_thread+0xa5c/0xc90 [cifs]
 ? cifs_handle_standard+0x1b0/0x1b0 [cifs]

Paulo Alcantara (SUSE) (5):
  cifs: Clean up DFS referral cache
  cifs: Get rid of kstrdup_const()'d paths
  cifs: Introduce helpers for finding TCP connection
  cifs: Merge is_path_valid() into get_normalized_path()
  cifs: Fix potential deadlock when updating vol in cifs_reconnect()

 fs/cifs/dfs_cache.c | 701 +++++++++++++++++++++++---------------------
 1 file changed, 372 insertions(+), 329 deletions(-)

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2.40.1