[SCSI] libfc: update mfs boundry checking

A previous commit changed the mfs checking to ensure the new
mfs is less or equal to the mfs supported by the FCF. This
doesn't work for BRDCM cards as they set an mfs of 2048 regardless
of whether the switch returns a larger mfs.

This patch validates the new mfs against the upper and lower spec
defined boundries for a FCoE mfs.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index ef9560dff295f9252bf9ccdf3a4d9d2de61d1852..cc83b66d45b7836aebe4fe55085935922fdb4a56 100644 (file)
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -1742,17 +1742,19 @@ void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
 
        mfs = ntohs(flp->fl_csp.sp_bb_data) &
                FC_SP_BB_DATA_MASK;
-       if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
-           mfs <= lport->mfs) {
-               lport->mfs = mfs;
-               fc_host_maxframe_size(lport->host) = mfs;
-       } else {
+
+       if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
                FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
                             "lport->mfs:%hu\n", mfs, lport->mfs);
                fc_lport_error(lport, fp);
                goto err;
        }
 
+       if (mfs <= lport->mfs) {
+               lport->mfs = mfs;
+               fc_host_maxframe_size(lport->host) = mfs;
+       }
+
        csp_flags = ntohs(flp->fl_csp.sp_features);
        r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
        e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);