From: Julia Lawall <[email protected]> TRIG_ROUND_NEAREST is 0, so a bit-and with it is always false. The value TRIG_ROUND_MASK covers the bits of the TRIG_ROUND constants, so first pick those bits and then make the test using ==.
The same is done for TRIG_ROUND_UP for symmetry, even though bit-and would be sufficient in this case. This problem was found using Coccinelle (http://coccinelle.lip6.fr/). Signed-off-by: Julia Lawall <[email protected]> --- The TRIG_ROUND_UP case could be left as is, if that is preferred. Or a temporary variable could be introduced to avoid anding with the mask twice. Actually, the following code suggests that the mask is not necessary, == would be sufficient: /* Only rounding flags are implemented */ cmd->flags &= TRIG_ROUND_NEAREST | TRIG_ROUND_UP | TRIG_ROUND_DOWN; But using the mask is safer, if there are future extensions. drivers/staging/comedi/drivers/me4000.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c index 8ca1b54..fc60117 100644 --- a/drivers/staging/comedi/drivers/me4000.c +++ b/drivers/staging/comedi/drivers/me4000.c @@ -949,10 +949,10 @@ static int ai_round_cmd_args(struct comedi_device *dev, *init_ticks = (cmd->start_arg * 33) / 1000; rest = (cmd->start_arg * 33) % 1000; - if (cmd->flags & TRIG_ROUND_NEAREST) { + if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) { if (rest > 33) (*init_ticks)++; - } else if (cmd->flags & TRIG_ROUND_UP) { + } else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) { if (rest) (*init_ticks)++; } @@ -962,10 +962,10 @@ static int ai_round_cmd_args(struct comedi_device *dev, *scan_ticks = (cmd->scan_begin_arg * 33) / 1000; rest = (cmd->scan_begin_arg * 33) % 1000; - if (cmd->flags & TRIG_ROUND_NEAREST) { + if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) { if (rest > 33) (*scan_ticks)++; - } else if (cmd->flags & TRIG_ROUND_UP) { + } else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) { if (rest) (*scan_ticks)++; } @@ -975,10 +975,10 @@ static int ai_round_cmd_args(struct comedi_device *dev, *chan_ticks = (cmd->convert_arg * 33) / 1000; rest = (cmd->convert_arg * 33) % 1000; - if (cmd->flags & TRIG_ROUND_NEAREST) { + if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) { if (rest > 33) (*chan_ticks)++; - } else if (cmd->flags & TRIG_ROUND_UP) { + } else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) { if (rest) (*chan_ticks)++; } _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
