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[SCSI] libsas: execute transport link resets with libata-eh via host workqueue

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Link resets leave ata affiliations intact, so arrange for libsas to make
an effort to avoid dropping the device due to a slow-to-recover link.
Towards this end carry out reset in the host workqueue so that it can
check for ata devices and kick the reset request to libata.  Hard
resets, in contrast, bypass libata since they are meant for associating
an ata device with another initiator in the domain (tears down
affiliations).

Need to add a new transport_sas_phy_reset() since the current
sas_phy_reset() is a utility function to libsas lldds.  They are not
prepared for it to loop back into eh.

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 2011-12-02 16:07:01 -08:00 • committed by James Bottomley
parent 0b3e09da13
commit 81c757bc69
8 changed files with 74 additions and 3 deletions
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drivers/scsi/libsas/sas_expander.c
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@ -228,7 +228,7 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
}
/* check if we have an existing attached ata device on this expander phy */
static struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
{
struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
struct domain_device *dev;