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[SCSI] libsas: enforce eh strategy handlers only in eh context

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The strategy handlers may be called in places that are problematic for
libsas (i.e. sata resets outside of domain revalidation filtering /
libata link recovery), or problematic for userspace (non-blocking ioctl
to sleeping reset functions).  However, these routines are also called
for eh escalations and recovery of scsi_eh_prep_cmnd(), so permit them
as long as we are running in the host's error handler, otherwise arrange
for them to be triggered in eh_context.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams
2012-06-21 23:30:48 -07:00
committed by James Bottomley
parent b9d5c6b7ef
commit 5db45bdc87
4 changed files with 140 additions and 4 deletions
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11
drivers/scsi/libsas/sas_discover.c
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@@ -39,6 +39,7 @@ void sas_init_dev(struct domain_device *dev)
{
switch (dev->dev_type) {
case SAS_END_DEV:
INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
break;
case EDGE_DEV:
case FANOUT_DEV:
@@ -286,6 +287,8 @@ void sas_free_device(struct kref *kref)
static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
{
struct sas_ha_struct *ha = port->ha;
sas_notify_lldd_dev_gone(dev);
if (!dev->parent)
dev->port->port_dev = NULL;
@@ -298,6 +301,14 @@ static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_d
sas_ata_end_eh(dev->sata_dev.ap);
spin_unlock_irq(&port->dev_list_lock);
spin_lock_irq(&ha->lock);
if (dev->dev_type == SAS_END_DEV &&
!list_empty(&dev->ssp_dev.eh_list_node)) {
list_del_init(&dev->ssp_dev.eh_list_node);
ha->eh_active--;
}
spin_unlock_irq(&ha->lock);
sas_put_device(dev);
}