On Mon, Jul 16 2007, James Bottomley wrote:
> lockdep noticed that with ATA support the port->dev_list_lock was
> entangled at irq context, so it now needs to become IRQ safe
>
> ---
> This applies against the aic94xx-sas-2.6 tree
>
> James
>
> diff --git a/drivers/scsi/libsas/sas_discover.c
> b/drivers/scsi/libsas/sas_discover.c
> index a18c0f6..ce3385c 100644
> --- a/drivers/scsi/libsas/sas_discover.c
> +++ b/drivers/scsi/libsas/sas_discover.c
> @@ -292,9 +292,9 @@ static int sas_get_port_device(struct asd_sas_port *port)
> port->disc.max_level = 0;
>
> dev->rphy = rphy;
> - spin_lock(&port->dev_list_lock);
> + spin_lock_irqsave(&port->dev_list_lock, flags);
> list_add_tail(&dev->dev_list_node, &port->dev_list);
> - spin_unlock(&port->dev_list_lock);
> + spin_unlock_irqrestore(&port->dev_list_lock, flags);
>
> return 0;
> }
already uses GFP_KERNEL, so spin_lock_irq() suffices.
> @@ -688,12 +688,14 @@ static void sas_discover_domain(struct work_struct
> *work)
> }
>
> if (error) {
> + unsigned long flags;
> +
> sas_rphy_free(dev->rphy);
> dev->rphy = NULL;
>
> - spin_lock(&port->dev_list_lock);
> + spin_lock_irqsave(&port->dev_list_lock, flags);
> list_del_init(&dev->dev_list_node);
> - spin_unlock(&port->dev_list_lock);
> + spin_unlock_irqrestore(&port->dev_list_lock, flags);
>
> kfree(dev); /* not kobject_register-ed yet */
> port->port_dev = NULL;
process context, no need to save flags here either.
> diff --git a/drivers/scsi/libsas/sas_expander.c
> b/drivers/scsi/libsas/sas_expander.c
> index d05fc23..1c15f37 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -628,6 +628,7 @@ static struct domain_device *sas_ex_discover_end_dev(
> struct domain_device *child = NULL;
> struct sas_rphy *rphy;
> int res;
> + unsigned long flags;
>
> if (phy->attached_sata_host || phy->attached_sata_ps)
> return NULL;
> @@ -677,9 +678,9 @@ static struct domain_device *sas_ex_discover_end_dev(
>
> child->rphy = rphy;
>
> - spin_lock(&parent->port->dev_list_lock);
> + spin_lock_irqsave(&parent->port->dev_list_lock, flags);
> list_add_tail(&child->dev_list_node, &parent->port->dev_list);
> - spin_unlock(&parent->port->dev_list_lock);
> + spin_unlock_irqrestore(&parent->port->dev_list_lock, flags);
>
> res = sas_discover_sata(child);
> if (res) {
ditto
> @@ -701,9 +702,9 @@ static struct domain_device *sas_ex_discover_end_dev(
> child->rphy = rphy;
> sas_fill_in_rphy(child, rphy);
>
> - spin_lock(&parent->port->dev_list_lock);
> + spin_lock_irqsave(&parent->port->dev_list_lock, flags);
> list_add_tail(&child->dev_list_node, &parent->port->dev_list);
> - spin_unlock(&parent->port->dev_list_lock);
> + spin_unlock_irqrestore(&parent->port->dev_list_lock, flags);
>
> res = sas_discover_end_dev(child);
> if (res) {
ditto
> @@ -767,6 +768,7 @@ static struct domain_device *sas_ex_discover_expander(
> struct sas_expander_device *edev;
> struct asd_sas_port *port;
> int res;
> + unsigned long flags;
>
> if (phy->routing_attr == DIRECT_ROUTING) {
> SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
> @@ -816,9 +818,9 @@ static struct domain_device *sas_ex_discover_expander(
> sas_fill_in_rphy(child, rphy);
> sas_rphy_add(rphy);
>
> - spin_lock(&parent->port->dev_list_lock);
> + spin_lock_irqsave(&parent->port->dev_list_lock, flags);
> list_add_tail(&child->dev_list_node, &parent->port->dev_list);
> - spin_unlock(&parent->port->dev_list_lock);
> + spin_unlock_irqrestore(&parent->port->dev_list_lock, flags);
>
> res = sas_discover_expander(child);
> if (res) {
ditto :-)
--
Jens Axboe
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