[PATCH 00/10] staging: comedi: some comedi_read() changes

[Ian Abbott]

Tidy up the "read" file operation handler, `comedi_read()` a bit and
improve the error handling and the "end-of-file" handling.

There are some other changes I want to make, such as switching to the
newer wait API (prepare_to_wait()/finish_wait()) and preventing several
tasks trying to read or write the same subdevice at the same time (but
without using the COMEDI device's main mutex as it is too coarse).
Those changes can wait until after I've cleaned up and improved the
"write" file operation handler a bit.

01) staging: comedi: remain busy until read end-of-file
02) staging: comedi: don't consider "unmunged" data when becoming
    non-busy
03) staging: comedi: do extra checks for becoming non-busy for "read"
04) staging: comedi: make some variables unsigned in comedi_read()
05) staging: comedi: avoid bad truncation of a size_t in comedi_read()
06) staging: comedi: allow buffer wraparound in comedi_read()
07) staging: comedi: remove superfluous retval = 0 in comedi_read()
08) staging: comedi: return error on "read" if no command set up
09) staging: comedi: simplify returned errors for comedi_read()
10) staging: comedi: check for more errors for zero-length read

 drivers/staging/comedi/comedi_fops.c | 68 +++++++++++++++++-------------------
 1 file changed, 32 insertions(+), 36 deletions(-)
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