Re: [PATCH] ide-cd: fix endianity for the error message in cdrom_read_capacity
- From: "Boris Petkov" <petkovbb@xxxxxxxxxxxxxx>
- Date: Wed, 30 Jul 2008 10:52:50 +0200
On Wed, Jul 30, 2008 at 10:18 AM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
On Wed, 30 Jul 2008 10:10:06 +0200 Petr Tesarik <ptesarik@xxxxxxx> 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@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxx>
I definitely like this one better, thanks.
Acked-by: Borislav Petkov <petkovbb@xxxxxxxxx>
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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