sata_nv: don't read shadow registers when in ADMA mode

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Reading from the ATA shadow registers while we are in ADMA mode may cause
undefined behavior.  Don't read the ATA status register when completing
commands for this reason, it shouldn't be needed as the controller will
notify us if the command failed.  Also, don't allow commands with result
taskfile requested to execute in ADMA mode, since that requires accessing
the shadow registers.  We also still need to override tf_read since libata
will read the result taskfile on a command failure, and we need to go into
port register mode before allowing this.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

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Robert Hancock 2007-03-26 21:43:36 -08:00 • committed by Jeff Garzik

parent 4dc5200d70

commit f2fb344bea

1 changed files with 20 additions and 13 deletions

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drivers/ata/sata_nv.c

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