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authorTejun Heo <tj@kernel.org>2009-04-18 23:46:02 (GMT)
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 05:37:31 (GMT)
commiteb6a61bb9543aa54d62595e27206b3d3c0293bcc (patch)
tree97d165ad28f62ff4754caff4ebde30e0506259d7 /drivers/oprofile
parent08f370f0a2fb223bf48d0bfa2a173be0393c19dc (diff)
downloadlinux-fsl-qoriq-eb6a61bb9543aa54d62595e27206b3d3c0293bcc.tar.xz
ide-atapi,tape,floppy: allow ->pc_callback() to change rq->data_len
Impact: allow residual count implementation in ->pc_callback() rq->data_len has two duties - carrying the number of input bytes on issue and carrying residual count back to the issuer on completion. ide-atapi completion callback ->pc_callback() is the right place to do this but currently ide-atapi depends on rq->data_len carrying the original request size after calling ->pc_callback() to complete the pc request. This patch makes ide_pc_intr(), ide_tape_issue_pc() and ide_floppy_issue_pc() cache length to complete before calling ->pc_callback() so that it can modify rq->data_len as necessary. Note: As using rq->data_len for two purposes can make cases like this incorrect in subtle ways, future changes will introduce separate field for residual count. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <jens.axboe@oracle.com>
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