Hi, with "CONFIG_USB_SUSPEND=y", since commit:
8dfe4b14869fd185ca25ee88b02ada58a3005eaf
usb-storage: implement autosuspend
This patch (as930) implements autosuspend for usb-storage. It is
adapted from a patch by Oliver Neukum. Autosuspend is allowed except
during LUN scanning, resets, and command execution.
my USB photo-camera gets automagically disconnected before I can do
anything with it ;)
Relevant dmesg (what I get by just attaching it):
[ 70.722898] scsi 8:0:0:0: Direct-Access HP PHOTOSMART E317 A001
PQ: 0 ANSI: 0 CCS
[ 70.727880] sd 8:0:0:0: [sdb] 488448 512-byte hardware sectors (250 MB)
[ 70.730876] sd 8:0:0:0: [sdb] Write Protect is off
[ 70.730879] sd 8:0:0:0: [sdb] Mode Sense: 00 46 00 00
[ 70.730882] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 70.742874] sd 8:0:0:0: [sdb] 488448 512-byte hardware sectors (250 MB)
[ 70.745873] sd 8:0:0:0: [sdb] Write Protect is off
[ 70.745876] sd 8:0:0:0: [sdb] Mode Sense: 00 46 00 00
[ 70.745878] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 70.745882] sdb: sdb1
[ 70.755192] sd 8:0:0:0: [sdb] Attached SCSI removable disk
[ 70.755446] sd 8:0:0:0: Attached scsi generic sg3 type 0
[ 70.755657] usb-storage: device scan complete
[ 73.071490] usb 6-2: usb auto-suspend
[ 73.321445] hub 6-0:1.0: state 7 ports 2 chg 0000 evt 0004
[ 73.321453] uhci_hcd 0000:00:1d.1: port 2 portsc 108a,00
[ 73.321462] hub 6-0:1.0: port 2, status 0100, change 0003, 12 Mb/s
[ 73.321465] usb 6-2: USB disconnect, address 2
[ 73.321467] usb 6-2: unregistering device
The relevant differences of dmesg between pre and post "autosuspend"
patch:
@@ -1,4 +1,4 @@
- Linux version 2.6.22-gb0e2a705 ...
+ Linux version 2.6.22-g8dfe4b14 ...
@@ -606,6 +606,12 @@
hub 1-0:1.0: hub_suspend
usb usb1: bus auto-suspend
ehci_hcd 0000:00:1a.7: suspend root hub
+ hub 4-0:1.0: hub_suspend
+ usb usb4: bus auto-suspend
+ usb usb4: suspend_rh
+ hub 5-0:1.0: hub_suspend
+ usb usb5: bus auto-suspend
+ usb usb5: suspend_rh
hub 6-0:1.0: hub_suspend
usb usb6: bus auto-suspend
usb usb6: suspend_rh
@@ -618,12 +624,6 @@
hub 3-0:1.0: hub_suspend
usb usb3: bus auto-suspend
usb usb3: suspend_rh
- hub 4-0:1.0: hub_suspend
- usb usb4: bus auto-suspend
- usb usb4: suspend_rh
- hub 5-0:1.0: hub_suspend
- usb usb5: bus auto-suspend
- usb usb5: suspend_rh
usb usb3: uevent
usb 3-0:1.0: uevent
usb 3-0:1.0: uevent
@@ -686,6 +686,7 @@
usb-storage 6-2:1.0: usb_probe_interface - got id
scsi8 : SCSI emulation for USB Mass Storage devices
drivers/usb/core/inode.c: creating file '002'
+ hub 6-0:1.0: state 7 ports 2 chg 0000 evt 0004
usb-storage: device found at 2
usb-storage: waiting for device to settle before scanning
hub 2-0:1.0: hub_suspend
@@ -704,3 +705,22 @@
sd 8:0:0:0: [sdb] Attached SCSI removable disk
sd 8:0:0:0: Attached scsi generic sg3 type 0
usb-storage: device scan complete
+ usb 6-2: usb auto-suspend
+ hub 6-0:1.0: state 7 ports 2 chg 0000 evt 0004
+ uhci_hcd 0000:00:1d.1: port 2 portsc 108a,00
+ hub 6-0:1.0: port 2, status 0100, change 0003, 12 Mb/s
+ usb 6-2: USB disconnect, address 2
+ usb 6-2: unregistering device
+ usb 6-2: usb_disable_device nuking all URBs
+ usb 6-2: unregistering interface 6-2:1.0
+ usb_endpoint usbdev6.2_ep82: ep_device_release called for usbdev6.2_ep82
+ usb_endpoint usbdev6.2_ep03: ep_device_release called for usbdev6.2_ep03
+ usb 6-2:1.0: uevent
+ usb 6-2:1.0: uevent
+ usb_endpoint usbdev6.2_ep00: ep_device_release called for usbdev6.2_ep00
+ usb 6-2: uevent
+ hub 6-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100
+ usb usb6: suspend_rh (auto-stop)
+ hub 6-0:1.0: hub_suspend
+ usb usb6: bus auto-suspend
+ usb usb6: suspend_rh
config for 2.6.22-gb0e2a705 attached
--
Paolo Ornati
Linux 2.6.23-rc3 on x86_64
config-usb.gz
Description: GNU Zip compressed data
