libata: change ATA_QCFLAG_DMAMAP semantics

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ATA_QCFLAG_DMAMAP was a bit peculiar in that it got set during qc
initialization and cleared if DMA mapping wasn't necessary.  Make it
more straight forward by making the following changes.

* Don't set it during initialization.  Set it after DMA is actually
  mapped.

* Add BUG_ON() to guarantee that there is data to transfer if DMAMAP
  is set.  This always holds for the current code.  The BUG_ON() is
  for docummentation and sanity check.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

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Tejun Heo 2007-12-05 16:43:10 +09:00 • committed by Jeff Garzik

parent 001102d785

commit f92a26365a

1 changed files with 7 additions and 8 deletions

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drivers/ata/libata-core.c

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