diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2011-11-17 17:59:50 -0800 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-02-19 13:50:12 -0600 |
| commit | 312d3e56119a4bc5c36a96818f87f650c069ddc2 (patch) | |
| tree | d8cf7586656301ff1c4e5a49f9cbddde61e3e561 /drivers/scsi/pm8001/pm8001_sas.c | |
| parent | b1124cd3ec97406c767b90bf7e93ecd2d2915592 (diff) | |
| download | linux-stable-312d3e56119a4bc5c36a96818f87f650c069ddc2.tar.gz linux-stable-312d3e56119a4bc5c36a96818f87f650c069ddc2.tar.bz2 linux-stable-312d3e56119a4bc5c36a96818f87f650c069ddc2.zip | |
[SCSI] libsas: remove ata_port.lock management duties from lldds
Each libsas driver (mvsas, pm8001, and isci) has invented a different
method for managing the ap->lock. The lock is held by the ata
->queuecommand() path. mvsas drops it prior to acquiring any internal
locks which allows it to hold its internal lock across calls to
task->task_done(). This capability is important as it is the only way
the driver can flush task->task_done() instances to guarantee that it no
longer has any in-flight references to a domain_device at
->lldd_dev_gone() time.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/pm8001/pm8001_sas.c')
| -rw-r--r-- | drivers/scsi/pm8001/pm8001_sas.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 50837933a1e5..310860e37d98 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -364,7 +364,7 @@ static int pm8001_task_exec(struct sas_task *task, const int num, struct pm8001_ccb_info *ccb; u32 tag = 0xdeadbeef, rc, n_elem = 0; u32 n = num; - unsigned long flags = 0, flags_libsas = 0; + unsigned long flags = 0; if (!dev->port) { struct task_status_struct *tsm = &t->task_status; @@ -388,11 +388,7 @@ static int pm8001_task_exec(struct sas_task *task, const int num, ts->stat = SAS_PHY_DOWN; spin_unlock_irqrestore(&pm8001_ha->lock, flags); - spin_unlock_irqrestore(dev->sata_dev.ap->lock, - flags_libsas); t->task_done(t); - spin_lock_irqsave(dev->sata_dev.ap->lock, - flags_libsas); spin_lock_irqsave(&pm8001_ha->lock, flags); if (n > 1) t = list_entry(t->list.next, |