On Thursday 27 May 2010, Mark Hounschell wrote: >On 05/26/2010 02:34 PM, Mark Hounschell wrote: >> My application uses SCSI disks of 256, 512, 768, and 1024 sector sizes. >> It uses the sg_io interface to talk to these devices. As of 2.6.27 if any >> SCSI disk is attached that has been formatted with a 256 byte sector >> size, the boot process hangs when it gets to the point of discovering USB >> devices. 512, 768, and 1024 sector sizes do not seem to trigger this. >> >> I have bisected this problem to the following commit: >> >> # git bisect good >> 427e59f09fdba387547106de7bab980b7fff77be is first bad commit >> commit 427e59f09fdba387547106de7bab980b7fff77be >> Author: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> >> Date: Sat Mar 8 18:24:17 2008 -0600 >> >> [SCSI] make use of the residue value >> >> USB sometimes doesn't return an error but instead returns a residue >> value indicating part (or all) of the command wasn't completed. So >> if the driver _done() error processing indicates the command was fully >> processed, subtract off the residue so that this USB error gets >> propagated. >> >> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> >> Signed-off-by: James Bottomley >> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> >> >> :040000 040000 d3bad84ebe1bc231e8e7d6267907ca62fd4d0dcd >> >> c85f8cb8bd4910724f0101e41054555980727e16 M drivers >> >> Now, what the hell USB has to do with my SCSI disks is beyond me. I have >> a feeling that this commit is just uncovering another problem. I've >> attached a dmesg from a working kernel and pointed out where the boot >> hangs and my SCSI disk light is on solid. Once it turns on solid the only >> recourse is to recycle power to the disk. The reset button does nothing >> to it. In fact a second will not even see the device because it is out to >> lunch. Not even a SCSI bus reset clears what ever has happened to the >> disk. >> >> This does the same thing on a 2.6.34 kernel also. Anything I can do to >> help, I'm available. >> >> Thanks and regards >> Mark > >I've attached the output from a serial console while trying to boot the >kernel with the above commit in. These disks have no partition table BTW. > >Thanks >Mark > Humm, I wonder if this is why I'm getting the impression but no real failure messages that actually tell me something because we no longer (used to) support a 256 byte/sector floppy, in either physical size? -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) BOFH excuse #149: Dew on the telephone lines. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
