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| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-06-22 07:38:26 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-06-24 00:32:32 -0700 |
| commit | 346c17a6cf60375323adfaa4b8a9d841049f890e (patch) | |
| tree | 496e65570ee7b7725806c1a5f21598521022f318 /drivers/ide/ide-dma.c | |
| parent | d9ae62433e46909fc9e7d97ce74202c2851667b8 (diff) | |
| download | linux-stable-346c17a6cf60375323adfaa4b8a9d841049f890e.tar.gz linux-stable-346c17a6cf60375323adfaa4b8a9d841049f890e.tar.bz2 linux-stable-346c17a6cf60375323adfaa4b8a9d841049f890e.zip | |
ide: relax DMA info validity checking
There are some broken devices that report multiple DMA xfer modes
enabled at once (ATA spec doesn't allow it) but otherwise work fine
with DMA so just delete ide_id_dma_bug().
[ As discovered by detective work by Frans and Bart, due to how
handling of the ID block was handled before commit c419993
("ide-iops: only clear DMA words on setting DMA mode") this
check was always seeing zeros in the fields or other similar
garbage. Therefore this check wasn't actually checking anything.
Now that the tests actually check the real bits, all we see are
devices that trigger the check yet work perfectly fine, therefore
killing this useless check is the best thing to do. -DaveM ]
Reported-by: Frans Pop <elendil@planet.nl>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/ide-dma.c')
| -rw-r--r-- | drivers/ide/ide-dma.c | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index 219e6fb78dc6..ee58c88dee5a 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c @@ -361,9 +361,6 @@ static int ide_tune_dma(ide_drive_t *drive) if (__ide_dma_bad_drive(drive)) return 0; - if (ide_id_dma_bug(drive)) - return 0; - if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) return config_drive_for_dma(drive); @@ -394,24 +391,6 @@ static int ide_dma_check(ide_drive_t *drive) return -1; } -int ide_id_dma_bug(ide_drive_t *drive) -{ - u16 *id = drive->id; - - if (id[ATA_ID_FIELD_VALID] & 4) { - if ((id[ATA_ID_UDMA_MODES] >> 8) && - (id[ATA_ID_MWDMA_MODES] >> 8)) - goto err_out; - } else if ((id[ATA_ID_MWDMA_MODES] >> 8) && - (id[ATA_ID_SWDMA_MODES] >> 8)) - goto err_out; - - return 0; -err_out: - printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name); - return 1; -} - int ide_set_dma(ide_drive_t *drive) { int rc; |