[PATCH resend 0/2] sr / usb-storage Add new no_read_disc_info quirk

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Hi All,

Some USB devices emulate a usb-mass-storage attached (scsi) cdrom device,
usually this fake cdrom contains the windows software for the device.
While working on supporting Appotech ax3003 based photoframes, which do
this I discovered that they will go of into lala land when ever they
see a READ_DISC_INFO scsi command.

I discussed this with Tejun (who did the commit which causes the cdrom
driver to always do the READ_DISC_INFO), and he said the best fix for
this would be using a device specific quirk.

So about a month ago I send a patch which added a new usb-storage quirk
for this and based on this quirk filtered out the READ_DISC_INFO scsi
cmd at the usb-storage level. Alan rightfully said this filtering
should be done at a higher level. So I wrote a 2 patch patchset adding
a scsi_dev flag for this, and doing the filtering in sr.c .

This is a resend of said patch set which I send to the linux-scsi and
linux-usb lists a month ago, which so far has gotten no response. I
hope that one of you has the time to review it.

Thanks & Regards,

Hans
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