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| author | Tejun Heo <htejun@gmail.com> | 2007-06-26 17:48:43 (GMT) |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-06-27 06:50:08 (GMT) |
| commit | b9a4197e266a40d5d1d16c9fb2a852cf10743afe (patch) | |
| tree | 6ec97e0122aae58944deee21c6619e23d86be64a /include | |
| parent | e00f1ff3c8977eff07d0214d2f3478ac947bda0f (diff) | |
| download | linux-fsl-qoriq-b9a4197e266a40d5d1d16c9fb2a852cf10743afe.tar.xz | |
libata: use PIO for non-16 byte aligned ATAPI commands
The IDE driver used DMA for ATAPI commands if READ/WRITE command is
multiple of sector size or sg command is multiple of 16 bytes. For
libata, READ/WRITE sector alignment is guaranteed by the high level
driver (sr), so we only have to worry about the 16 byte alignment.
This patch makes ata_check_atapi_dma() always request PIO for all data
transfer commands which are not multiple of 16 bytes.
The following reports are related to this problem.
http://bugzilla.kernel.org/show_bug.cgi?id=8605 (confirmed)
http://thread.gmane.org/gmane.linux.kernel/476620 (confirmed)
https://bugzilla.novell.com/show_bug.cgi?id=229260 (probably)
Albert first pointed out the difference between IDE and libata. Kudos
to him.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions