linux-kernel - Re: [BUG] ide dma_timer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4677FB77.1050903@ru.mvista.com>
Date:	Tue, 19 Jun 2007 19:51:19 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Mark Lord <lkml@....ca>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linas Vepstas <linas@...tin.ibm.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup

Mark Lord wrote:

>>>>>> I can prepare a patch, but only with a lot of guidance. I can test 
>>>>>> & debug, I'm highly motivated just right now ... 

>>>>> If you've got a nice repeatable problem please try using the libata
>>>>> driver. That handles the error paths differently and doesn't try a 
>>>>> FIFO
>>>>> drain which might matter in this case I guess.

>>>>    FIFO drain for DMA commands?

>>> Welcome to the old IDE layer which I am so glad I left behind 8)

>>> ide_ata_error will try and do a PIO flush regardless of the command type
>>> if DRQ_STAT is asserted. See ide_dma_intr -> ide_error -> ...

>>    Indeed... but the thing is we don't know what's asserted in this 
>> case -- remember, it's reading the status register that locks 
>> everything up...

> Exactly.  And IORDY shouldn't really apply there,
> unless some nitwit standards person wrote it into a spec..

    Wrote what? IORDY throttling does *apply* to both data and non-data 
register accesses, of course.

> -ml

MBR, Sergei
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/