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authorElias Oltmanns <eo@nebensachen.de>2008-09-21 05:54:08 -0400
committerJeff Garzik <jgarzik@redhat.com>2008-09-29 00:27:54 -0400
commit45fabbb77bd95adff7a80bde1c7a0ace1075fde6 (patch)
tree0e98efc190b25a11f84b8ae7d1ee0a17c41d3da8 /drivers/ata/ahci.c
parentea6ce53cd5d005455ec0a3cc1d45d3af0cb90919 (diff)
libata: Implement disk shock protection support
On user request (through sysfs), the IDLE IMMEDIATE command with UNLOAD FEATURE as specified in ATA-7 is issued to the device and processing of the request queue is stopped thereafter until the specified timeout expires or user space asks to resume normal operation. This is supposed to prevent the heads of a hard drive from accidentally crashing onto the platter when a heavy shock is anticipated (like a falling laptop expected to hit the floor). In fact, the whole port stops processing commands until the timeout has expired in order to avoid any resets due to failed commands on another device. Signed-off-by: Elias Oltmanns <eo@nebensachen.de> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6acea41eb7ca..aeadd00411a1 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -316,6 +316,7 @@ static struct device_attribute *ahci_shost_attrs[] = {
316 316
317static struct device_attribute *ahci_sdev_attrs[] = { 317static struct device_attribute *ahci_sdev_attrs[] = {
318 &dev_attr_sw_activity, 318 &dev_attr_sw_activity,
319 &dev_attr_unload_heads,
319 NULL 320 NULL
320}; 321};
321 322