[PATCH 0/6] staging: comedi: fix some minor issues with file poll op

[Ian Abbott]

A few changes for the "poll" file operation to avoid poll-waiting on the
same subdevice for both read and write (patch 1), avoid allocating write
buffer space unnecessarily and possibly inappropriately (patch 4),
consider whether any active commands belong to the current file object
(patch 5), and avoid using the main mutex (for performance reasons)
(patch 6).

1) staging: comedi: don't poll_wait on same subdevice twice
2) staging: comedi: rename comedi_buf_write_n_available
3) staging: comedi: add new comedi_buf_write_n_available()
4) staging: comedi: don't allocate buffer space when polling for write
5) staging: comedi: check command started by file being polled
6) staging: comedi: don't use mutex when polling file

 drivers/staging/comedi/comedi_buf.c      | 19 +++++++++++++------
 drivers/staging/comedi/comedi_fops.c     | 17 +++++++++--------
 drivers/staging/comedi/comedi_internal.h |  1 +
 3 files changed, 23 insertions(+), 14 deletions(-)