4.9-stable review patch. If anyone has any objections, please let me know.
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From: Frank Mori Hess fmh6jj@gmail.com
commit a42ae5905140c324362fe5036ae1dbb16e4d359c upstream.
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
--- drivers/staging/comedi/drivers.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -484,8 +484,7 @@ unsigned int comedi_nsamples_left(struct 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;