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authorDan Williams <dan.j.williams@intel.com>2010-10-01 13:55:52 -0700
committerJames Bottomley <James.Bottomley@suse.de>2010-12-21 12:23:53 -0600
commit00f0254ed9b19164d416dc2e3c2e81eda55a6faf (patch)
treed33cb0b2c36ecd9ef4dbe32d9294dbd5c221f852 /drivers/scsi/libsas
parent3ff5588d3f8afad65ded52ac0e4191462fe034cb (diff)
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[SCSI] libsas: fix definition of wideport, include local sas address
To date libsas has only looked at the attached sas address when determining the formation of wide ports. The specification and some hardware expects that phys with different addresses will not form a wide port unless the local peer phys also match each other. Introduce a flag to select stricter behavior at sas_register_ha() time. The flag can be dropped once it is known that all libsas users expect the same behavior. Current drivers just initialize this field to zero and get the traditional behavior. Reported-by: Patrick Thomson <patrick.s.thomson@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_port.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index fe8b74c..5257fdf 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -28,6 +28,17 @@
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
+static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
+{
+ struct sas_ha_struct *sas_ha = phy->ha;
+
+ if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
+ SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
+ memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
+ return false;
+ return true;
+}
+
/**
* sas_form_port -- add this phy to a port
* @phy: the phy of interest
@@ -45,8 +56,7 @@ static void sas_form_port(struct asd_sas_phy *phy)
unsigned long flags;
if (port) {
- if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
- SAS_ADDR_SIZE) != 0)
+ if (!phy_is_wideport_member(port, phy))
sas_deform_port(phy);
else {
SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
@@ -62,9 +72,7 @@ static void sas_form_port(struct asd_sas_phy *phy)
port = sas_ha->sas_port[i];
spin_lock(&port->phy_list_lock);
if (*(u64 *) port->sas_addr &&
- memcmp(port->attached_sas_addr,
- phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
- port->num_phys > 0) {
+ phy_is_wideport_member(port, phy) && port->num_phys > 0) {
/* wide port */
SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
port->id);