Alan Stern wrote:
[ 126.512815] usb 1-1: usb auto-resume
[ 126.543447] uhci_hcd 0000:00:1f.2: port 1 portsc 00a5,01
[ 126.559426] usb 1-1: finish resume
[ 126.561435] usb 1-1: gone after usb resume? status -19
[ 126.561445] usb 1-1: can't resume, status -19
[ 126.561451] hub 1-0:1.0: logical disconnect on port 1
[ 126.562486] sd 5:0:0:0: [sdb] Result: hostbyte=DID_ERROR
driverbyte=DRIVER_OK,SUGGEST_OK
This suggests a bug in the device's firmware, probably it sends a
1-byte Device-Status reply instead of a 2-byte reply as required by the
USB spec. You could find out for certain by using usbmon.
But if that is indeed the problem, the patch below should help. I've
seen it before; perhaps we should adopt this workaround permanently.
Relevant info:
-obviously, I'm using uhci
-the drive is SATA, connected to USB with a SATA/IDE to USB adapter
-this problem does not occur with a USB flash drive
-reverting the commit that introduced auto-suspend prevents this error.
If necessary you could disable autosuspend for your drive. But first
test this patch.
Alan Stern
Index: 2.6.23-rc1/drivers/usb/core/hub.c
===================================================================
--- 2.6.23-rc1.orig/drivers/usb/core/hub.c
+++ 2.6.23-rc1/drivers/usb/core/hub.c
@@ -1644,9 +1644,10 @@ static int finish_port_resume(struct usb
* and device drivers will know about any resume quirks.
*/
if (status == 0) {
+ devstatus = 0;
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
if (status >= 0)
- status = (status == 2 ? 0 : -ENODEV);
+ status = (status > 0 ? 0 : -ENODEV);
}
if (status) {
Alan,
Yes, that patch worked, and dmesg now shows the device auto-suspending
and resuming every few seconds. Thanks a lot. I hope you do merge this
patch or a workaround like it.
Dan
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