dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

[SCSI] iscsi_tcp: fix xmittask oops 

XMSTATE_SOL_HDR could be set when the xmit thread tests it, but there may
not be anything on the r2tqueue yet. Move the XMSTATE_SOL_HDR set
before the addition to the queue to make sure that when we pull something
off it it is valid. This does not add locks around the xmstate test or make
that a atmoic_t because this is a fast path and if it is set when we test it
we can handle it there without the overhead. Later on we check the xmitqueue
for all requests with the session lock so we will not miss it.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2006-11-08 15:58:33 -06:00 committed by James Bottomley
parent d6e24d1c8a
commit db37c505e5
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/scsi/iscsi_tcp.c
View File

@ -415,8 +415,8 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
iscsi_solicit_data_init(conn, ctask, r2t);
tcp_ctask->exp_r2tsn = r2tsn + 1;
tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
__kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
list_move_tail(&ctask->running, &conn->xmitqueue);
scsi_queue_work(session->host, &conn->xmitwork);
@ -1627,9 +1627,12 @@ static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
if (!tcp_ctask->r2t)
if (!tcp_ctask->r2t) {
spin_lock_bh(&session->lock);
__kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
sizeof(void*));
spin_unlock_bh(&session->lock);
}
send_hdr:
r2t = tcp_ctask->r2t;
dtask = &r2t->dtask;