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authorDamien Le Moal <damien.lemoal@opensource.wdc.com>2022-02-28 18:48:57 +0900
committerMartin K. Petersen <martin.petersen@oracle.com>2022-03-01 23:56:27 -0500
commit32698c955295957d63f042f4bb30e9d613ca8b55 (patch)
treec58527095ea010eb5cb26f2b76e6bd9d35ce9e15 /drivers/scsi/libsas
parent26440303310591e29121964ede0048583cb3126d (diff)
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scsi: libsas: Clean up sas_form_port()
Sparse throws a warning about context imbalance ("different lock contexts for basic block") in sas_form_port() as it gets confused with the fact that a port is locked within one of the two search loops and unlocked afterward outside of the search loops once the phy is added to the port. Since this code is not easy to follow, improve it by factoring out the code adding the phy to the port once the port is locked into the helper function sas_form_port_add_phy(). This helper can then be called directly within the port search loops, avoiding confusion and clearing the sparse warning. Link: https://lore.kernel.org/r/20220228094857.557329-1-damien.lemoal@opensource.wdc.com Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_port.c73
1 files changed, 42 insertions, 31 deletions
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index 67b429dcf1ff..11599c0e3fc3 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -67,6 +67,34 @@ static void sas_resume_port(struct asd_sas_phy *phy)
sas_discover_event(port, DISCE_RESUME);
}
+static void sas_form_port_add_phy(struct asd_sas_port *port,
+ struct asd_sas_phy *phy, bool wideport)
+{
+ list_add_tail(&phy->port_phy_el, &port->phy_list);
+ sas_phy_set_target(phy, port->port_dev);
+ phy->port = port;
+ port->num_phys++;
+ port->phy_mask |= (1U << phy->id);
+
+ if (wideport)
+ pr_debug("phy%d matched wide port%d\n", phy->id,
+ port->id);
+ else
+ memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
+
+ if (*(u64 *)port->attached_sas_addr == 0) {
+ port->class = phy->class;
+ memcpy(port->attached_sas_addr, phy->attached_sas_addr,
+ SAS_ADDR_SIZE);
+ port->iproto = phy->iproto;
+ port->tproto = phy->tproto;
+ port->oob_mode = phy->oob_mode;
+ port->linkrate = phy->linkrate;
+ } else {
+ port->linkrate = max(port->linkrate, phy->linkrate);
+ }
+}
+
/**
* sas_form_port - add this phy to a port
* @phy: the phy of interest
@@ -79,7 +107,7 @@ static void sas_form_port(struct asd_sas_phy *phy)
int i;
struct sas_ha_struct *sas_ha = phy->ha;
struct asd_sas_port *port = phy->port;
- struct domain_device *port_dev;
+ struct domain_device *port_dev = NULL;
struct sas_internal *si =
to_sas_internal(sas_ha->core.shost->transportt);
unsigned long flags;
@@ -110,8 +138,9 @@ static void sas_form_port(struct asd_sas_phy *phy)
if (*(u64 *) port->sas_addr &&
phy_is_wideport_member(port, phy) && port->num_phys > 0) {
/* wide port */
- pr_debug("phy%d matched wide port%d\n", phy->id,
- port->id);
+ port_dev = port->port_dev;
+ sas_form_port_add_phy(port, phy, true);
+ spin_unlock(&port->phy_list_lock);
break;
}
spin_unlock(&port->phy_list_lock);
@@ -122,40 +151,22 @@ 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 == 0
- && port->num_phys == 0) {
- memcpy(port->sas_addr, phy->sas_addr,
- SAS_ADDR_SIZE);
+ && port->num_phys == 0) {
+ port_dev = port->port_dev;
+ sas_form_port_add_phy(port, phy, false);
+ spin_unlock(&port->phy_list_lock);
break;
}
spin_unlock(&port->phy_list_lock);
}
- }
- if (i >= sas_ha->num_phys) {
- pr_err("%s: couldn't find a free port, bug?\n", __func__);
- spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
- return;
+ if (i >= sas_ha->num_phys) {
+ pr_err("%s: couldn't find a free port, bug?\n",
+ __func__);
+ spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
+ return;
+ }
}
-
- /* add the phy to the port */
- port_dev = port->port_dev;
- list_add_tail(&phy->port_phy_el, &port->phy_list);
- sas_phy_set_target(phy, port_dev);
- phy->port = port;
- port->num_phys++;
- port->phy_mask |= (1U << phy->id);
-
- if (*(u64 *)port->attached_sas_addr == 0) {
- port->class = phy->class;
- memcpy(port->attached_sas_addr, phy->attached_sas_addr,
- SAS_ADDR_SIZE);
- port->iproto = phy->iproto;
- port->tproto = phy->tproto;
- port->oob_mode = phy->oob_mode;
- port->linkrate = phy->linkrate;
- } else
- port->linkrate = max(port->linkrate, phy->linkrate);
- spin_unlock(&port->phy_list_lock);
spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
if (!port->port) {