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| author | Bart Van Assche <bvanassche@acm.org> | 2013-08-14 15:37:08 +0000 |
|---|---|---|
| committer | Robert Love <robert.w.love@intel.com> | 2013-09-04 13:23:38 -0700 |
| commit | 5d73bea2d3a004698d16ba5face89f0bef383e76 (patch) | |
| tree | a652a9094b2f4bb3d9398bf3da3497c2af1c3f8f | |
| parent | b86788658be425a5454246a954721d9122d2b3d6 (diff) | |
| download | linux-5d73bea2d3a004698d16ba5face89f0bef383e76.tar.gz linux-5d73bea2d3a004698d16ba5face89f0bef383e76.tar.bz2 linux-5d73bea2d3a004698d16ba5face89f0bef383e76.zip | |
libfc: Protect ep->esb_stat changes via ex_lock
This patch avoids that the WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT))
statement in fc_seq_send_locked() gets triggered sporadically when
running FCoE target code due to concurrent ep->esb_stat modifications.
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>
| -rw-r--r-- | drivers/scsi/libfc/fc_exch.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c index 7000203845bd..bc0aba4fabb4 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -988,6 +988,7 @@ static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, } } + spin_lock_bh(&ep->ex_lock); /* * At this point, we have the exchange held. * Find or create the sequence. @@ -1015,11 +1016,11 @@ static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, * sending RSP, hence write request on other * end never finishes. */ - spin_lock_bh(&ep->ex_lock); sp->ssb_stat |= SSB_ST_RESP; sp->id = fh->fh_seq_id; - spin_unlock_bh(&ep->ex_lock); } else { + spin_unlock_bh(&ep->ex_lock); + /* sequence/exch should exist */ reject = FC_RJT_SEQ_ID; goto rel; @@ -1030,6 +1031,7 @@ static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, if (f_ctl & FC_FC_SEQ_INIT) ep->esb_stat |= ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); fr_seq(fp) = sp; out: @@ -1479,8 +1481,11 @@ static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) f_ctl = ntoh24(fh->fh_f_ctl); fr_seq(fp) = sp; + + spin_lock_bh(&ep->ex_lock); if (f_ctl & FC_FC_SEQ_INIT) ep->esb_stat |= ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); if (fc_sof_needs_ack(sof)) fc_seq_send_ack(sp, fp); |