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author | Akinobu Mita <akinobu.mita@gmail.com> | 2013-07-08 16:01:57 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-09 10:33:30 -0700 |
commit | a451751172b39702e94c683882ab01d816b673c7 (patch) | |
tree | 27a77c2517c4c8af1dcb81c8a6cea0d3c9fba5c3 /lib | |
parent | d05257238f9bbe96477162448c2dda08309af208 (diff) | |
download | op-kernel-dev-a451751172b39702e94c683882ab01d816b673c7.zip op-kernel-dev-a451751172b39702e94c683882ab01d816b673c7.tar.gz |
scsi_debug: fix do_device_access() with wrap around range
do_device_access() is a function that abstracts copying SG list from/to
ramdisk storage (fake_storep).
It must deal with the ranges exceeding actual fake_storep size, because
such ranges are valid if virtual_gb is set greater than zero, and they
should be treated as fake_storep is repeatedly mirrored up to virtual
size.
Unfortunately, it can't deal with the range which wraps around the end of
fake_storep. A wrap around range is copied by two
sg_copy_{from,to}_buffer() calls, but sg_copy_{from,to}_buffer() can't
copy from/to in the middle of SG list, therefore the second call can't
copy correctly.
This fixes it by using sg_pcopy_{from,to}_buffer() that can copy from/to
the middle of SG list.
This also simplifies the assignment of sdb->resid in
fill_from_dev_buffer(). Because fill_from_dev_buffer() is now only called
once per command execution cycle. So it is not necessary to take care to
decrease sdb->resid if fill_from_dev_buffer() is called more than once.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Horia Geanta <horia.geanta@freescale.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions