linux-kernel - Re: [PATCH] ide-cd: fix endianity for the error message in cdrom_read

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Date:	Wed, 30 Jul 2008 10:52:50 +0200
From:	"Boris Petkov" <petkovbb@...glemail.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Cc:	"Petr Tesarik" <ptesarik@...e.cz>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, "Jens Axboe" <jens.axboe@...cle.com>,
	"Jan Kara" <jack@...e.cz>,
	"Bartlomiej Zolnierkiewicz" <bzolnier@...il.com>
Subject: Re: [PATCH] ide-cd: fix endianity for the error message in cdrom_read_capacity

On Wed, Jul 30, 2008 at 10:18 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 30 Jul 2008 10:10:06 +0200 Petr Tesarik <ptesarik@...e.cz> wrote:
>
>> Resent because of a typo in the LKML address. :(
>
> Thanks.
>
>>
>> Aesthetic regards aside, commit e8e7b9eb11c34ee18bde8b7011af41938d1ad667
>> still leaves a bug in the error message, because it uses the unconverted
>> big-endian value for printk.
>>
>> Fix this by using a local variable in machine byte order. The result is
>> correct, more readable, and also produces slightly shorter code on i386.
>>
>> Cc: Jens Axboe <jens.axboe@...cle.com>
>> Cc: Jan Kara <jack@...e.cz>
>> Signed-off-by: Petr Tesarik <ptesarik@...e.cz>

I definitely like this one better, thanks.

Acked-by: Borislav Petkov <petkovbb@...il.com>


>
> Bart owns this patch now.  It got lost for a month and it has already
> been fixed twice and it is also on the route to 2.6.25.x and 2.6.26.x,
> so it'll get complicated.  Not a happy little patch.

Greg, can you please apply this one on top of -stable.

>
>>
>>  ide-cd.c |   18 ++++++++++--------
>>  1 file changed, 10 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
>> --- a/drivers/ide/ide-cd.c
>> +++ b/drivers/ide/ide-cd.c
>> @@ -1305,6 +1305,7 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
>>       int stat;
>>       unsigned char cmd[BLK_MAX_CDB];
>>       unsigned len = sizeof(capbuf);
>> +     __u32 blocklen;
>>
>>       memset(cmd, 0, BLK_MAX_CDB);
>>       cmd[0] = GPCMD_READ_CDVD_CAPACITY;
>> @@ -1317,23 +1318,24 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
>>       /*
>>        * Sanity check the given block size
>>        */
>> -     switch (capbuf.blocklen) {
>> -     case __constant_cpu_to_be32(512):
>> -     case __constant_cpu_to_be32(1024):
>> -     case __constant_cpu_to_be32(2048):
>> -     case __constant_cpu_to_be32(4096):
>> +     blocklen = be32_to_cpu(capbuf.blocklen);
>> +     switch (blocklen) {
>> +     case 512:
>> +     case 1024:
>> +     case 2048:
>> +     case 4096:
>>               break;
>>       default:
>>               printk(KERN_ERR "%s: weird block size %u\n",
>> -                     drive->name, capbuf.blocklen);
>> +                     drive->name, blocklen);
>>               printk(KERN_ERR "%s: default to 2kb block size\n",
>>                       drive->name);
>> -             capbuf.blocklen = __constant_cpu_to_be32(2048);
>> +             blocklen = 2048;
>>               break;
>>       }
>>
>>       *capacity = 1 + be32_to_cpu(capbuf.lba);
>> -     *sectors_per_frame = be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS;
>> +     *sectors_per_frame = blocklen >> SECTOR_BITS;
>>       return 0;
>>  }
>>
>>
> --
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-- 
Regards/Gruß,
Boris
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