linux-kernel - Re: [PATCH 13/18] ide: use ->tf_load in SELECT

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <499AAC24.70200@ru.mvista.com>
Date:	Tue, 17 Feb 2009 15:23:00 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/18] ide: use ->tf_load in SELECT_DRIVE()

Hello, I wrote:

>>> There should be no functional changes caused by this patch.
>>> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>>> Index: b/drivers/ide/ide-iops.c
>>> ===================================================================
>>> --- a/drivers/ide/ide-iops.c
>>> +++ b/drivers/ide/ide-iops.c
>>> @@ -88,11 +88,15 @@ void SELECT_DRIVE (ide_drive_t *drive)
>>>  {
>>>      ide_hwif_t *hwif = drive->hwif;
>>>      const struct ide_port_ops *port_ops = hwif->port_ops;
>>> +    ide_task_t task;
>>>  
>>>      if (port_ops && port_ops->selectproc)
>>>          port_ops->selectproc(drive);
>>>  
>>> -    hwif->OUTB(drive->select.all, hwif->io_ports.device_addr);
>>> +    memset(&task, 0, sizeof(task));
>>> +    task.tf_flags = IDE_TFLAG_OUT_DEVICE;
>>> +
>>> +    drive->hwif->tf_load(drive, &task);
>>
>>    This actually doesn't seem like a bright idea to me, considering 
>> that this gets called when starting every request. How will you look 
>> at me adding the transport method for writing this register? :-)
> Convert SELECT_DRIVE() to use ->tf_load instead of ->OUTB.
>
>   OTOH, adding such a "backdoor" to the taskfile doesn't seem very 
> consistent...

   ... which didn't prevent libata from having such backdoor though, in 
the form of dev_select() method.

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/