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staging: comedi: fix comedi_nsamples_left.

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A rounding error was causing comedi_nsamples_left to
return the wrong value when nsamples was not a multiple
of the scan length.

Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Frank Mori Hess <fmh6jj@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Mori Hess 2018-02-15 15:13:42 -05:00 committed by Greg Kroah-Hartman
parent cb57469c95
commit a42ae59051
1 changed files with 1 additions and 2 deletions
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3
drivers/staging/comedi/drivers.c
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@ -475,8 +475,7 @@ unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
struct comedi_cmd *cmd = &async->cmd;
if (cmd->stop_src == TRIG_COUNT) {
unsigned int nscans = nsamples / cmd->scan_end_arg;
unsigned int scans_left = __comedi_nscans_left(s, nscans);
unsigned int scans_left = __comedi_nscans_left(s, cmd->stop_arg);
unsigned int scan_pos =
comedi_bytes_to_samples(s, async->scan_progress);
unsigned long long samples_left = 0;