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

[Hartley Sweeten]

On Monday, October 12, 2015 9:21 AM, Ian Abbott wrote:
> 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(-)

Thanks!

Reviewed-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>

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