[SCSI] libfc: fix checking FC_TYPE_BLS

Its checked after skb freed, so instead have fh_type
cached and then check FC_TYPE_BLS against cached
fh_type value.

This wrong check was causing double exch locking as
reported by Bhanu at
https://lists.open-fcoe.org/pipermail/devel/2011-October/011793.html

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 7c055fd..81235f3 100644 (file)
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -469,6 +469,7 @@ static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp,
        struct fc_frame_header *fh = fc_frame_header_get(fp);
        int error;
        u32 f_ctl;
+       u8 fh_type = fh->fh_type;
 
        ep = fc_seq_exch(sp);
        WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT);
@@ -493,7 +494,7 @@ static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp,
         */
        error = lport->tt.frame_send(lport, fp);
 
-       if (fh->fh_type == FC_TYPE_BLS)
+       if (fh_type == FC_TYPE_BLS)
                return error;
 
        /*