diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-05-18 00:44:06 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-05-19 18:36:49 (GMT) |
| commit | 7cb001d4c4fa7e1cc1a55388a9544e160dddc610 (patch) | |
| tree | 4a2f977161dfee41fb332eafac0bc420aba7c69a | |
| parent | e00be9e4d0ffcc0121606229f0aa4b246d6881d7 (diff) | |
| download | linux-7cb001d4c4fa7e1cc1a55388a9544e160dddc610.tar.xz | |
scsi_tcp: block BH in TCP callbacks
iscsi_sw_tcp_data_ready() and iscsi_sw_tcp_state_change() were
using read_lock(&sk->sk_callback_lock) which is fine if caller
disabled BH.
TCP stack no longer has this requirement and can run from
process context.
Use read_lock_bh() variant to restore previous assumption.
Ideally this code could use RCU instead...
Fixes: 5413d1babe8f ("net: do not block BH while processing socket backlog")
Fixes: d41a69f1d390 ("tcp: make tcp_sendmsg() aware of socket backlog")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Venkatesh Srinivas <venkateshs@google.com>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 2e4c82f..ace4f1f 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -131,10 +131,10 @@ static void iscsi_sw_tcp_data_ready(struct sock *sk) struct iscsi_tcp_conn *tcp_conn; read_descriptor_t rd_desc; - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); conn = sk->sk_user_data; if (!conn) { - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); return; } tcp_conn = conn->dd_data; @@ -154,7 +154,7 @@ static void iscsi_sw_tcp_data_ready(struct sock *sk) /* If we had to (atomically) map a highmem page, * unmap it now. */ iscsi_tcp_segment_unmap(&tcp_conn->in.segment); - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); } static void iscsi_sw_tcp_state_change(struct sock *sk) @@ -165,10 +165,10 @@ static void iscsi_sw_tcp_state_change(struct sock *sk) struct iscsi_session *session; void (*old_state_change)(struct sock *); - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); conn = sk->sk_user_data; if (!conn) { - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); return; } session = conn->session; @@ -179,7 +179,7 @@ static void iscsi_sw_tcp_state_change(struct sock *sk) tcp_sw_conn = tcp_conn->dd_data; old_state_change = tcp_sw_conn->old_state_change; - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); old_state_change(sk); } |