Re: [linux-usb-devel] [2.6-test] Bug in usb-storage or scsi?

[James Bottomley <James.Bottomley@steeleye.com>]

On Thu, 2003-09-11 at 16:05, Alan Stern wrote:
> What do people think of just having per-device flags that the host driver
> could set during the slave_configure() callback?  The point of these flags
> is not to prevent bad commands from being sent to the device --
> user-generated commands sent via sg should always be allowed.  Rather, the
> point is to prevent sd.c from generating these commands in the first
> place.  (Apparently the commands don't present a problem for sr.c.)

I'm not in principle opposed to this.  That's essentially what Andries
did for the mode sense 6 vs 10 problem.

> So for example, usb-storage could set the BFLAG to block MODE-SENSE page 8
> for any disk-type device.  This isn't a perfect solution; consider an
> iSCSI-attached device that is actually a usb-storage disk on some server.  
> Nevertheless, this might take care of the majority of the problems we see.  
> (I haven't seen any MODE-SENSE page 0x3f problems, but others have.)

They can't be BLIST flags, they have to be flags in the struct
scsi_device, but they're easy to add as long as we get a definitive list
of what's necessary.

James