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OpenCloudOS-Kernel
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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>
This commit is contained in:
Joe Eykholt 2010-03-12 16:07:46 -08:00 committed by James Bottomley
parent 4dc7ccf7e9
commit 2f2ac4a0df
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/libfc/fc_lport.c
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@ -228,9 +228,12 @@ static void fc_lport_ptp_setup(struct fc_lport *lport,
u64 remote_wwnn)
{
mutex_lock(&lport->disc.disc_mutex);
if (lport->ptp_rdata)
if (lport->ptp_rdata) {
lport->tt.rport_logoff(lport->ptp_rdata);
kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
}
lport->ptp_rdata = lport->tt.rport_create(lport, remote_fid);
kref_get(&lport->ptp_rdata->kref);
lport->ptp_rdata->ids.port_name = remote_wwpn;
lport->ptp_rdata->ids.node_name = remote_wwnn;
mutex_unlock(&lport->disc.disc_mutex);
@ -947,7 +950,11 @@ static void fc_lport_reset_locked(struct fc_lport *lport)
if (lport->dns_rdata)
lport->tt.rport_logoff(lport->dns_rdata);
lport->ptp_rdata = NULL;
if (lport->ptp_rdata) {
lport->tt.rport_logoff(lport->ptp_rdata);
kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy);
lport->ptp_rdata = NULL;
}
lport->tt.disc_stop(lport);