ksmbd: defer connection scavenging while session locks are busy

The expiration worker holds conn_list_lock for reading while checking
for authenticated sessions. Without this change, the check can wait for
conn->session_lock or sessions_table_lock.

In destroy_previous_session(), the status updates after
ksmbd_conn_wait_idle_sess() run with both session locks held for
writing. Both the KSMBD_SESS_GOOD error path and the
KSMBD_SESS_NEED_SETUP success path call ksmbd_all_conn_set_status(),
which takes conn_list_lock for reading.

A writer queued on conn_list_lock can block these new read acquisitions.
The worker then waits for a session lock held by
destroy_previous_session(), which waits behind the writer. The writer
cannot proceed until the worker releases conn_list_lock.

Try both session locks instead of waiting in the scavenging check. Keep
the connection when either lock is busy and let the periodic worker
retry later.

Fixes: d7fd1f98607f ("ksmbd: follow SMB2 session expiration semantics")
Cc: stable@vger.kernel.org
Reported-by: Abdifatah Suruur <suruurism@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions