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| author |   Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-26 20:13:09 +0100 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-26 20:13:09 +0100 |
| commit | 9e47be0c97f7357b80e91dc0632e9cce2eb025e0 (patch) | |
| tree | 7047b2b3c9ac094b801d376e4bbb95292b1962ac /include | |
| parent | ide: add ide_busy_sleep() helper (diff) | |
| download | linux-dev-9e47be0c97f7357b80e91dc0632e9cce2eb025e0.tar.xz linux-dev-9e47be0c97f7357b80e91dc0632e9cce2eb025e0.zip | |
ide: remove broken disk byte-swapping support
Remove broken disk byte-swapping support:
- it can cause a data corruption on SMP (or if using PREEMPT on UP)
- all data coming from disk are byte-swapped by taskfile_*_data() which
results in incorrect identify data being reported by /proc/ide/ and IOCTLs
- "hdx=bswap/byteswap" kernel parameter has been broken on m68k host drivers
(including Atari/Q40 ones) since 2.5.x days (because of 'hwif' zero-ing)
- byte-swapping is limited to PIO transfers (for working with TiVo disks on
x86 machines using user-space solutions or dm-byteswap should result in
much better performance because DMA can be used)
For previous discussions please see:
http://www.ussg.iu.edu/hypermail/linux/kernel/0201.0/0768.html
http://lkml.org/lkml/2004/2/28/111
[ I have dm-byteswap device mapper target if somebody is interested
(patch is for 2.6.4 though but I'll dust it off if needed). ]
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ide.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/ide.h b/include/linux/ide.h index 74f1ef9c6d94..f94cf036bd95 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -394,7 +394,6 @@ typedef struct ide_drive_s { u8 state; /* retry state */ u8 waiting_for_dma; /* dma currently in progress */ u8 unmask; /* okay to unmask other irqs */ - u8 bswap; /* byte swap data */ u8 noflush; /* don't attempt flushes */ u8 dsc_overlap; /* DSC overlap */ u8 nice1; /* give potential excess bandwidth */ |