linux-kernel - Re: [PATCH][RESUBMIT] drivers/ide/ide-probe.c, kernel 2.6.23.1

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Message-ID: <473DD778.30607@purplescout.se>
Date:	Fri, 16 Nov 2007 18:46:32 +0100
From:	Jonas Stare <jonas.stare@...plescout.se>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH][RESUBMIT] drivers/ide/ide-probe.c, kernel 2.6.23.1

Sergei Shtylyov wrote:
> Jonas Stare wrote:
> 
>> diff -u linux-2.6.23.1-orig/drivers/ide/ide-probe.c
>> linux-2.6.23.1/drivers/ide/ide-probe.c ---
>> linux-2.6.23.1-orig/drivers/ide/ide-probe.c 2007-10-12
>> 18:43:44.000000000 +0200
>> +++ linux-2.6.23.1/drivers/ide/ide-probe.c      2007-11-16
>> 10:26:23.000000000 +0100
>> @@ -643,6 +643,7 @@
>>  static int wait_hwif_ready(ide_hwif_t *hwif)
>>  {
>>         int rc;
>> +       int unit;
>>  
>>         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
>>  
>> @@ -659,16 +660,25 @@
>>                 return rc;
>>  
>>         /* Now make sure both master & slave are ready */
>> -       SELECT_DRIVE(&hwif->drives[0]);
>> -       hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
>> -       mdelay(2);
>> -       rc = ide_wait_not_busy(hwif, 35000);
>> -       if (rc)
>> -               return rc;
>> -       SELECT_DRIVE(&hwif->drives[1]);
>> -       hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
>> -       mdelay(2);
>> -       rc = ide_wait_not_busy(hwif, 35000);
>> +       for (unit = 0; unit < MAX_DRIVES; ++unit) {
>> +               /* Ignore disks that we will not probe for later. */
>> +               if (!hwif->drives[unit].noprobe ||
>> +                   hwif->drives[unit].present) {
> 
>    Why not:
> 
>         if (hwif->drives[unit].noprobe || !hwif->drives[unit].present) {
>                     printk(KERN_DEBUG "Skip ide_wait_not_busy for %s:%d\n",
>                                hwif->name, unit);
>             continue;
>         }
>                 SELECT_DRIVE(&hwif->drives[unit]);
>                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
>                 mdelay(2);
>                 rc = ide_wait_not_busy(hwif, 35000);
>                 if (rc) {
>             /* Exit function with master reselected */
>                         if (unit != 0)
>                             SELECT_DRIVE(&hwif->drives[0]);
>                         return rc;
>             }
>     }

Hmmm, I was rather fond of my "wait for the disk unless we are specifically told not to"
rather than "don't check unless there might be a disk there". ...on the other hand
thats not what my comment said. :)

>>  
>>         /* Exit function with master reselected (let's be sane) */
>>         SELECT_DRIVE(&hwif->drives[0]);
> 
> MBR, Sergei
-
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