tree 34c298f6a4390675b1e87a17893793d7e2925f1d
parent ee4063fa6bd801fa6ea045f23a2934db009b3dac
author Ian Abbott <abbotti@mev.co.uk> 1274286161 +0100
committer Greg Kroah-Hartman <gregkh@suse.de> 1275683933 -0700

Staging: comedi: don't write to buffer if command finished

For write(), any data copied to the data buffer after the previously
set up streaming acquisition command has finished won't be used, but a
non-empty write() does not currently return 0 (or -EPIPE on error) after
the command has finished until the data buffer has been filled up.
Change this behavior to return 0 (or -EPIPE) any time after the command
has finished, without bothering to fill up the buffer with more useless
data.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>