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[SCSI] libfc: fix oops in point-to-point mode
In point-to-point mode, if the PLOGI to the remote port times out, it can get deleted by the remote port module. Since there's no reference by the local port, lport->ptp_data points to a freed rport, and when the local port is reset and tries to logout again, an oops occurs in mutex_lock_nested(). Hold a reference count on the point-to-point rdata. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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@ -228,9 +228,12 @@ static void fc_lport_ptp_setup(struct fc_lport *lport,
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u64 remote_wwnn)
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{
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mutex_lock(&lport->disc.disc_mutex);
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if (lport->ptp_rdata)
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if (lport->ptp_rdata) {
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lport->tt.rport_logoff(lport->ptp_rdata);
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kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
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}
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lport->ptp_rdata = lport->tt.rport_create(lport, remote_fid);
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kref_get(&lport->ptp_rdata->kref);
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lport->ptp_rdata->ids.port_name = remote_wwpn;
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lport->ptp_rdata->ids.node_name = remote_wwnn;
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mutex_unlock(&lport->disc.disc_mutex);
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@ -947,7 +950,11 @@ static void fc_lport_reset_locked(struct fc_lport *lport)
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if (lport->dns_rdata)
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lport->tt.rport_logoff(lport->dns_rdata);
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lport->ptp_rdata = NULL;
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if (lport->ptp_rdata) {
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lport->tt.rport_logoff(lport->ptp_rdata);
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kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
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lport->ptp_rdata = NULL;
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}
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lport->tt.disc_stop(lport);
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