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

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Date:	Thu, 20 Nov 2014 19:27:49 +0100
From:	Barto <mister.freeman@...oste.net>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"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

Hello,

here is the result of the command :

$ for i in /sys/class/scsi_host/*; do cat $i/can_queue; done
1
1
1
1
1
1
31
31

but the sata DVD burner is now connected on a Jmicron sata PCIe card (
with this configuration the bug doesn't occur ), I don't know if this
change can modify the result of your command,

here is the result of another command :

$ for i in /sys/class/scsi_host/*; do cat $i/proc_name; done
pata_jmicron
pata_jmicron
ata_piix
ata_piix
ata_piix
ata_piix
ahci
ahci

$ dmesg | grep ahci
[    0.883351] ahci 0000:03:00.0: version 3.0
[    0.883505] ahci 0000:03:00.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps
0x3 impl SATA mode
[    0.883508] ahci 0000:03:00.0: flags: 64bit ncq pm led clo pmp pio
slum part
[    0.884329] scsi host6: ahci
[    0.884502] scsi host7: ahci

Le 20/11/2014 18:53, Christoph Hellwig a écrit :
> 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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