linux-kernel - Re: BUG in scsi_lib.c due to a bad commit

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Date:	Thu, 20 Nov 2014 09:53:16 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Barto <mister.freeman@...oste.net>
Cc:	Christoph Hellwig <hch@...radead.org>,
	"Elliott, Robert (Server Storage)" <Elliott@...com>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: BUG in scsi_lib.c due to a bad commit

On Thu, Nov 20, 2014 at 06:44:32PM +0100, Barto wrote:
> I notice that my motherboard doesn't support "AHCI" mode, my motherboard
> uses an ICH7 sata controler, ICH7 doesn't support AHCI if I check the
> technical specifications of this controler,
> 
> it seems that my bios treats SATA devices like IDE devices ( IDE
> emulation mode ), for example I can read in the bios these lines "IDE 0
> channel master : "the name of Sata harddisk 1", "IDE 3 channel master :
> "the name of Sata harddisk 2",
> 
> perhaps the bug only occurs when the AHCI mode is not used ?

Looks like it.  I suspect you device only supports a single outstanding
command without AHCI, can you confirm this by doing:

for i in /sys/class/scsi_host/*; do cat $i/can_queue; done

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