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libfc: Avoid that sending after an abort triggers a kernel warning

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Calling fc_seq_send() after an ABTS message has been received triggers
a kernel warning (WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT))). Avoid
this by returning -ENXIO to the caller if fc_seq_send() is invoked after
an ABTS message has been received.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
This commit is contained in:
Bart Van Assche 2013-08-14 15:37:52 +00:00 committed by Robert Love
parent 5d73bea2d3
commit cae7b6dd6c
1 changed files with 37 additions and 22 deletions
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59
drivers/scsi/libfc/fc_exch.c
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@ -463,15 +463,21 @@ static void fc_exch_delete(struct fc_exch *ep)
}
static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp,
struct fc_frame *fp)
struct fc_frame *fp)
{
struct fc_exch *ep;
struct fc_frame_header *fh = fc_frame_header_get(fp);
int error;
int error = -ENXIO;
u32 f_ctl;
u8 fh_type = fh->fh_type;
ep = fc_seq_exch(sp);
if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) {
fc_frame_free(fp);
goto out;
}
WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT));
f_ctl = ntoh24(fh->fh_f_ctl);
@ -514,6 +520,9 @@ out:
* @lport: The local port that the exchange will be sent on
* @sp: The sequence to be sent
* @fp: The frame to be sent on the exchange
*
* Note: The frame will be freed either by a direct call to fc_frame_free(fp)
* or indirectly by calling libfc_function_template.frame_send().
*/
static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp,
struct fc_frame *fp)
@ -621,27 +630,31 @@ static int fc_exch_abort_locked(struct fc_exch *ep,
if (!sp)
return -ENOMEM;
ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL;
if (timer_msec)
fc_exch_timer_set_locked(ep, timer_msec);
/*
* If not logged into the fabric, don't send ABTS but leave
* sequence active until next timeout.
*/
if (!ep->sid)
return 0;
/*
* Send an abort for the sequence that timed out.
*/
fp = fc_frame_alloc(ep->lp, 0);
if (fp) {
fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
FC_TYPE_BLS, FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
error = fc_seq_send_locked(ep->lp, sp, fp);
} else
error = -ENOBUFS;
if (ep->sid) {
/*
* Send an abort for the sequence that timed out.
*/
fp = fc_frame_alloc(ep->lp, 0);
if (fp) {
ep->esb_stat |= ESB_ST_SEQ_INIT;
fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid,
FC_TYPE_BLS, FC_FC_END_SEQ |
FC_FC_SEQ_INIT, 0);
error = fc_seq_send_locked(ep->lp, sp, fp);
} else {
error = -ENOBUFS;
}
} else {
/*
* If not logged into the fabric, don't send ABTS but leave
* sequence active until next timeout.
*/
error = 0;
}
ep->esb_stat |= ESB_ST_ABNORMAL;
return error;
}
@ -1299,9 +1312,10 @@ static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
spin_unlock_bh(&ep->ex_lock);
goto reject;
}
if (!(ep->esb_stat & ESB_ST_REC_QUAL))
if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
ep->esb_stat |= ESB_ST_REC_QUAL;
fc_exch_hold(ep); /* hold for REC_QUAL */
ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL;
}
fc_exch_timer_set_locked(ep, ep->r_a_tov);
fp = fc_frame_alloc(ep->lp, sizeof(*ap));
@ -1322,6 +1336,7 @@ static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
}
sp = fc_seq_start_next_locked(sp);
fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
ep->esb_stat |= ESB_ST_ABNORMAL;
spin_unlock_bh(&ep->ex_lock);
fc_frame_free(rx_fp);
return;