From 4e108d4f281609a4f6e413d736be7364671016c5 Mon Sep 17 00:00:00 2001 From: Hou Pu Date: Thu, 16 Jul 2020 06:02:11 -0400 Subject: scsi: target: iscsi: Fix login error when receiving iscsi_target_sk_data_ready() could be invoked indirectly by iscsi_target_do_login_rx() from the workqueue like this: iscsi_target_do_login_rx() iscsi_target_do_login() iscsi_target_do_tx_login_io() iscsit_put_login_tx() iscsi_login_tx_data() tx_data() sock_sendmsg_nosec() tcp_sendmsg() release_sock() sk_backlog_rcv() tcp_v4_do_rcv() tcp_data_ready() iscsi_target_sk_data_ready() At that time LOGIN_FLAGS_READ_ACTIVE is not cleared and iscsi_target_sk_data_ready will not read data from the socket. Some iscsi initiators (libiscsi) will wait forever for a reply. LOGIN_FLAGS_READ_ACTIVE should be cleared early just after doing the receive and before writing to the socket in iscsi_target_do_login_rx. Unfortunately, LOGIN_FLAGS_READ_ACTIVE is also used by sk_state_change to do login cleanup if a socket was closed at login time. It is supposed to be cleared after the login PDU is successfully processed and replied. Introduce another flag, LOGIN_FLAGS_WRITE_ACTIVE, to cover the transmit part. Link: https://lore.kernel.org/r/20200716100212.4237-2-houpu@bytedance.com Reviewed-by: Mike Christie Signed-off-by: Hou Pu Signed-off-by: Martin K. Petersen --- include/target/iscsi/iscsi_target_core.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'include/target') diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h index 4fda324f4b35..1eccb2ac7d02 100644 --- a/include/target/iscsi/iscsi_target_core.h +++ b/include/target/iscsi/iscsi_target_core.h @@ -556,10 +556,11 @@ struct iscsi_conn { struct socket *sock; void (*orig_data_ready)(struct sock *); void (*orig_state_change)(struct sock *); -#define LOGIN_FLAGS_READ_ACTIVE 1 -#define LOGIN_FLAGS_CLOSED 2 -#define LOGIN_FLAGS_READY 4 -#define LOGIN_FLAGS_INITIAL_PDU 8 +#define LOGIN_FLAGS_READY 0 +#define LOGIN_FLAGS_INITIAL_PDU 1 +#define LOGIN_FLAGS_READ_ACTIVE 2 +#define LOGIN_FLAGS_WRITE_ACTIVE 3 +#define LOGIN_FLAGS_CLOSED 4 unsigned long login_flags; struct delayed_work login_work; struct iscsi_login *login; -- cgit v1.2.3