Hi,
On 04/04/2010 08:56 PM, Josua Dietze wrote:
Hans de Goede schrieb:
But one of the variants (usb id 1908:1320) still hits a usb-reset
when drivers/scsi/sr.c does a READ_CAPACITY from get_sector_size().
After the initial READ_CAPACITY failure and the usb reset, the
second READ_CAPACITY succeeds.
Did you try to set the AVOID_RESET_QUIRK attribute? This was
originally targeted at those mode-switching devices, but might be
useful in this case too.
Thanks for the hint. although not really what I was looking for
this has prompted me to investigate this issue further as I was
not completely happy with the NO_ULD_ATTACH solution.
After turning on full debugging in the usb-storage driver it
turns out the out enabling of US_FL_SANE_SENSE was the culprit,
when I explicitly specify US_FL_BAD_SENSE, thus disabling the
auto enabling of SANE_SENSE, things are much better, the
first 2 READ_CAPACITY calls still fail (stalled endpoint), but
no longer result in a full device reset.
I'll do a patch adding these devices to unusual_devs.h with
the US_FL_BAD_SENSE quirk tomorrow.
Thanks all for your input.
Regards,
Hans
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