Re: 2.6.15-rc2-git5 continues to fail suspending (USB issue)

[Patrizio Bassi <patrizio.bassi@gmail.com>]

Alan Stern ha scritto:

>On Sat, 26 Nov 2005, Patrizio Bassi wrote:
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>>>You wrote about it on lkml, not linux-usb-devel.  So it might not have 
>>>been noticed by the USB developers.
>>>
>>> 
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>>>
>>o sorry you're right. i tought usb team followed the main ml too.
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>Some do and some don't.
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>>globespan device is a zyxel prestige 630 adsl modem using eciadsl
>>userspace drivers.
>>after killing the driver it suspended and resumed.
>>
>>but i got a problem, trying to restart driver.
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>>[EciAdsl 3/5] Synchronization...
>>
>> ERROR reading interrupts
>>*** glibc detected *** double free or corruption (fasttop): 0x0804f158 ***
>>/usr/bin/eciadsl-start: line 517: 11399 Abortito               
>>"$BIN_DIR/eciadsl-synch" $synch_options
>>ERROR: failed to get synchronization
>>
>>usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd eciadsl-synch rqt 192 rq 222
>>len 13 ret -110
>>
>>tried 3 times, always the same.
>>so i manually unplugged modem and replugged.
>>works perfectly (as usual).
>>
>>seems a problem on suspending and resuming attached device.
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>Maybe it's a problem in the device.
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no..why should after resume?
however i remember some kernels ago (.13/.14) it worked
after resume hotplug restarted my driver, now not.

>>i've access to eciadsl cvs so i can patch it.
>>the first problem (no suspend) i think can be fixed binding some signals
>>in userspace, which?
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>There are no signals sent to userspace on suspend.  It's too late to send 
>signals, because all tasks have already been frozen.
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>Instead the usbfs code has to be changed to handle suspend/resume events 
>on behalf of userspace drivers.  Or you could use that patch I mentioned 
>before; it unbinds drivers that don't have suspend methods.
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i don't like to use such big patches, i'm sure Greg will merge fast ;)

>>the second seems an init problem, that i leave to you :)
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>I can't do anything about it, since I don't have one of those modems.
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>Alan Stern
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i understand, i appreciate your help.