From 0a219edb263ef93e4fd7a83804bea667e72a7bfa Mon Sep 17 00:00:00 2001 From: Vasu Dev Date: Mon, 16 May 2011 16:45:51 -0700 Subject: [SCSI] libfc: fix race in SRR response In this case fsp was freed before error handler was invoked, this is fixed by having SRR fsp reference freed by exch destructor so that fsp will be always held until it exch is freed. Also don't reset fsp->recov_seq since this is needed by SRR error handler to do exch done. Signed-off-by: Vasu Dev Tested-by: Ross Brattain Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/libfc/fc_fcp.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c index f880d40d4e78..57704e814681 100644 --- a/drivers/scsi/libfc/fc_fcp.c +++ b/drivers/scsi/libfc/fc_fcp.c @@ -1673,7 +1673,8 @@ static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) FC_FCTL_REQ, 0); rec_tov = get_fsp_rec_tov(fsp); - seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL, + seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, + fc_fcp_pkt_destroy, fsp, jiffies_to_msecs(rec_tov)); if (!seq) goto retry; @@ -1720,7 +1721,6 @@ static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) return; } - fsp->recov_seq = NULL; switch (fc_frame_payload_op(fp)) { case ELS_LS_ACC: fsp->recov_retry = 0; @@ -1732,10 +1732,9 @@ static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) break; } fc_fcp_unlock_pkt(fsp); - fsp->lp->tt.exch_done(seq); out: + fsp->lp->tt.exch_done(seq); fc_frame_free(fp); - fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ } /** @@ -1747,8 +1746,6 @@ static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) { if (fc_fcp_lock_pkt(fsp)) goto out; - fsp->lp->tt.exch_done(fsp->recov_seq); - fsp->recov_seq = NULL; switch (PTR_ERR(fp)) { case -FC_EX_TIMEOUT: if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) @@ -1764,7 +1761,7 @@ static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) } fc_fcp_unlock_pkt(fsp); out: - fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */ + fsp->lp->tt.exch_done(fsp->recov_seq); } /** -- cgit v1.2.2