Re: USB storage SCSI EH oops

From: Jens Axboe
Date: Wed Apr 18 2012 - 03:57:03 EST

On 04/18/2012 09:53 AM, James Bottomley wrote:
> On Sat, 2012-04-14 at 15:49 -0700, Linus Torvalds wrote:
>> On Sat, Apr 14, 2012 at 3:29 PM, Linus Torvalds
>> <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>>> Confirmed.
>>> I tested twice: with that patch, the oops is repeatable, and happens
>>> something like 30 seconds after plugging in the USB thing into the
>>> monitor.
>>> With that patch reverted, the thing still doesn't *work*, but I don't
>>> get the oops. Instead, I get the appended noise in my dmesg..
>> .. and the reason that card reader has trouble seems to be that it's
>> just too damn old, and doesn't understand SD-HC cards. It works fine
>> with old SD cards.
>> So the reader is fine (well, apart from being too old), USB-storage is
>> fine, but the SCSI error handler is broken.
>> Even with that commit reverted, once the SCSI layer has decided to
>> off-line the device, you can't get it back, even if you remove the
>> media and insert a non-HC SD card. You have to unplug and re-plug the
>> reader. That seems to be a slight misfeature of SCSI error handling,
>> but compared to oopsing, it's minor.
> OK, will either queue the update or a revert.

Martins patch went into -git 4 days ago. Since Linus didn't follow up in
rage, I was assuming the issue had been resolved with that.

Jens Axboe

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