Bug 14175

Summary:	hdparm hangs 15 seconds on USB drive
Product:	Drivers	Reporter:	Tormod Volden (bugz.kernel.tormod)
Component:	USB	Assignee:	Greg Kroah-Hartman (greg)
Status:	RESOLVED INVALID
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
URL:	https://bugs.launchpad.net/bugs/428469
Kernel Version:	2.6.31	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	dmesg output, plugging in the drive and running hdparm on it

Description Tormod Volden 2009-09-13 22:09:47 UTC

The USB drive includes:
ID 04b4:6830 Cypress Semiconductor Corp. CY7C68300A EZ-USB AT2 USB 2.0 to
ATA/ATAPI
scsi 2:0:0:0: Direct-Access     WDC WD25 00BEVE-00WZT0         PQ: 0 ANSI: 0

When I run hdparm it hangs for 15 seconds:

$ time sudo hdparm /dev/sdb

/dev/sdb:
 HDIO_DRIVE_CMD(identify) failed: Invalid exchange
 readonly = 0 (off)
 readahead = 256 (on)
 geometry = 30401/255/63, sectors = 488397168, start = 0

real 0m15.979s
user 0m0.000s
sys 0m0.008s

I have the ums_cypress modules loaded. This appears in dmesg:
usb 1-7: reset high speed USB device using ehci_hcd and address 2

Comment 1 Tormod Volden 2009-09-13 22:11:27 UTC

Created attachment 23090 [details]
dmesg output, plugging in the drive and running hdparm on it

Comment 2 Greg Kroah-Hartman 2009-09-14 02:28:51 UTC

That is because the device does not support the requests that hdparm made to it (I'm amazed that it did anything.)

Nothing we can do about this, the device times out properly, and everything works fine afterward.