From cae7b6dd6c569f18f5c8e3f33cac60fbaeb58140 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Wed, 14 Aug 2013 15:37:52 +0000 Subject: [PATCH] libfc: Avoid that sending after an abort triggers a kernel warning 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 Cc: Neil Horman Signed-off-by: Robert Love --- drivers/scsi/libfc/fc_exch.c | 59 +++++++++++++++++++++++++++----------------- 1 file changed, 37 insertions(+), 22 deletions(-) diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c index bc0aba4..2a7fd5a 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -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; -- 2.7.4