This patch avoids that the following kernel crash can occur with
later patches in this patch series:
general protection fault: 0000 [#1] SMP
CPU: 0 PID: 6 Comm: kworker/u8:0 Not tainted 4.3.0-rc1-debug+ #1
Workqueue: tmr-fileio target_tmr_work [target_core_mod]
Call Trace:
[<ffffffff810a6915>] lock_acquire+0x65/0x90
[<ffffffff815e740b>] _raw_spin_lock_irqsave+0x4b/0x60
[<ffffffffa03bc7ca>] target_release_cmd_kref+0x2a/0xa0 [target_core_mod]
[<ffffffffa03bd418>] target_put_sess_cmd+0x28/0x50 [target_core_mod]
[<ffffffffa03bad50>] core_tmr_lun_reset+0x390/0x640 [target_core_mod]
[<ffffffffa03bce50>] target_tmr_work+0x80/0xd0 [target_core_mod]
[<ffffffff81070e6d>] process_one_work+0x19d/0x430
[<ffffffff8107120f>] worker_thread+0x10f/0x460
[<ffffffff810772ba>] kthread+0xea/0x100
[<ffffffff815e7a2f>] ret_from_fork+0x3f/0x70
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Andy Grover <agrover@xxxxxxxxxx>
---
drivers/target/tcm_fc/tfc_sess.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/target/tcm_fc/tfc_sess.c b/drivers/target/tcm_fc/tfc_sess.c
index 7b934ea..45947e2 100644
--- a/drivers/target/tcm_fc/tfc_sess.c
+++ b/drivers/target/tcm_fc/tfc_sess.c
@@ -260,6 +260,14 @@ static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id)
return NULL;
}
+static void ft_close_sess(struct ft_sess *sess)
+{
+ transport_deregister_session_configfs(sess->se_sess);
+ target_sess_cmd_list_set_waiting(sess->se_sess);
+ target_wait_for_sess_cmds(sess->se_sess);
+ ft_sess_put(sess);
+}
+
/*
* Delete all sessions from tport.
* Caller holds ft_lport_lock.
@@ -273,8 +281,7 @@ static void ft_sess_delete_all(struct ft_tport *tport)
head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
hlist_for_each_entry_rcu(sess, head, hash) {
ft_sess_unhash(sess);
- transport_deregister_session_configfs(sess->se_sess);
- ft_sess_put(sess); /* release from table */
+ ft_close_sess(sess); /* release from table */
}
}
}
@@ -313,8 +320,7 @@ void ft_sess_close(struct se_session *se_sess)
pr_debug("port_id %x\n", port_id);
ft_sess_unhash(sess);
mutex_unlock(&ft_lport_lock);
- transport_deregister_session_configfs(se_sess);
- ft_sess_put(sess);
+ ft_close_sess(sess);
/* XXX Send LOGO or PRLO */
synchronize_rcu(); /* let transport deregister happen */
}
@@ -460,8 +466,7 @@ static void ft_prlo(struct fc_rport_priv *rdata)
return;
}
mutex_unlock(&ft_lport_lock);
- transport_deregister_session_configfs(sess->se_sess);
- ft_sess_put(sess); /* release from table */
+ ft_close_sess(sess); /* release from table */
rdata->prli_count--;
/* XXX TBD - clearing actions. unit attn, see 4.10 */
}
--
2.1.4
--
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