spontaneous disconnect with "usb-storage: implement autosuspend"

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

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