diff options
| -rw-r--r-- | Documentation/feature-removal-schedule.txt | 19 | ||||
| -rw-r--r-- | drivers/ata/libata-core.c | 6 | ||||
| -rw-r--r-- | drivers/ata/libata-scsi.c | 28 | ||||
| -rw-r--r-- | drivers/ata/libata.h | 1 |
4 files changed, 53 insertions, 1 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index c6322c7..498ff31 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -328,3 +328,22 @@ Who: Adrian Bunk <bunk@stusta.de> --------------------------- +What: libata.spindown_compat module parameter +When: Dec 2008 +Why: halt(8) synchronizes caches for and spins down libata disks + because libata didn't use to spin down disk on system halt + (only synchronized caches). + Spin down on system halt is now implemented and can be tested + using sysfs node /sys/class/scsi_disk/h:c:i:l/manage_start_stop. + Because issuing spin down command to an already spun down disk + makes some disks spin up just to spin down again, the old + behavior needs to be maintained till userspace tool is updated + to check the sysfs node and not to spin down disks with the + node set to one. + This module parameter is to give userspace tool the time to + get updated and should be removed after userspace is + reasonably updated. +Who: Tejun Heo <htejun@gmail.com> + +--------------------------- + diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 2e2a2fa..bf8f65b 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -101,6 +101,12 @@ int libata_noacpi = 1; module_param_named(noacpi, libata_noacpi, int, 0444); MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set"); +int ata_spindown_compat = 1; +module_param_named(spindown_compat, ata_spindown_compat, int, 0644); +MODULE_PARM_DESC(spindown_compat, "Enable backward compatible spindown " + "behavior. Will be removed. More info can be found in " + "Documentation/feature-removal-schedule.txt\n"); + MODULE_AUTHOR("Jeff Garzik"); MODULE_DESCRIPTION("Library module for ATA devices"); MODULE_LICENSE("GPL"); diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 8f80019..dd81fa7 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -944,9 +944,35 @@ static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) } tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ - } else + } else { + /* XXX: This is for backward compatibility, will be + * removed. Read Documentation/feature-removal-schedule.txt + * for more info. + */ + if (ata_spindown_compat && + (system_state == SYSTEM_HALT || + system_state == SYSTEM_POWER_OFF)) { + static int warned = 0; + + if (!warned) { + spin_unlock_irq(qc->ap->lock); + ata_dev_printk(qc->dev, KERN_WARNING, + "DISK MIGHT NOT BE SPUN DOWN PROPERLY. " + "UPDATE SHUTDOWN UTILITY\n"); + ata_dev_printk(qc->dev, KERN_WARNING, + "For more info, visit " + "http://linux-ata.org/shutdown.html\n"); + warned = 1; + ssleep(5); + spin_lock_irq(qc->ap->lock); + } + scmd->result = SAM_STAT_GOOD; + return 1; + } + /* Issue ATA STANDBY IMMEDIATE command */ tf->command = ATA_CMD_STANDBYNOW1; + } /* * Standby and Idle condition timers could be implemented but that diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 5f4d40c..316bf8a 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -58,6 +58,7 @@ extern int atapi_enabled; extern int atapi_dmadir; extern int libata_fua; extern int libata_noacpi; +extern int ata_spindown_compat; extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev); extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev, u64 block, u32 n_block, unsigned int tf_flags, |
