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scsi: libsas: Add dev_parent_is_expander() helper 

Many libsas drivers check if the parent of the device is an expander.
Create a helper that the libsas drivers will use in follow up commits.

Suggested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Link: https://lore.kernel.org/r/20250814173215.1765055-15-cassel@kernel.org
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
pull/1354/merge
Niklas Cassel 2025-08-14 19:32:18 +02:00 committed by Martin K. Petersen
parent 251be2f603
commit e5eb72c92e
2 changed files with 9 additions and 4 deletions
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5
drivers/scsi/libsas/sas_expander.c
View File

@ -1313,10 +1313,7 @@ static int sas_check_parent_topology(struct domain_device *child)
int i;
int res = 0;
if (!child->parent)
return 0;
if (!dev_is_expander(child->parent->dev_type))
if (!dev_parent_is_expander(child))
return 0;
parent_ex = &child->parent->ex_dev;

8
include/scsi/libsas.h
View File

@ -203,6 +203,14 @@ static inline bool dev_is_expander(enum sas_device_type type)
type == SAS_FANOUT_EXPANDER_DEVICE;
}
static inline bool dev_parent_is_expander(struct domain_device *dev)
{
if (!dev->parent)
return false;
return dev_is_expander(dev->parent->dev_type);
}
static inline void INIT_SAS_WORK(struct sas_work *sw, void (*fn)(struct work_struct *))
{
INIT_WORK(&sw->work, fn);