Messages in this thread | | | Date | Mon, 27 Jul 2020 11:12:18 -0400 | From | William Breathitt Gray <> | Subject | Re: [PATCH][next] counter: microchip-tcb-capture: remove ATMEL_TC_ETRGEDG_NONE bit check |
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On Mon, Jul 27, 2020 at 03:06:00PM +0100, Colin King wrote: > From: Colin Ian King <colin.king@canonical.com> > > The macro ATMEL_TC_ETRGEDG_NONE is defined as 0 << 8 which is zero and > hence the check cmr & ATMEL_TC_ETRGEDG_NONE can never be true. Since > *action is already assigned MCHP_TC_SYNAPSE_ACTION_NONE then this check > and set is redundant dead code and can be removed. > > Addresses-Coverity: ("Logically dead code") > Signed-off-by: Colin Ian King <colin.king@canonical.com> > --- > drivers/counter/microchip-tcb-capture.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c > index f7b7743ddb94..119640d6d6ab 100644 > --- a/drivers/counter/microchip-tcb-capture.c > +++ b/drivers/counter/microchip-tcb-capture.c > @@ -185,9 +185,7 @@ static int mchp_tc_count_action_get(struct counter_device *counter, > > *action = MCHP_TC_SYNAPSE_ACTION_NONE; > > - if (cmr & ATMEL_TC_ETRGEDG_NONE) > - *action = MCHP_TC_SYNAPSE_ACTION_NONE; > - else if (cmr & ATMEL_TC_ETRGEDG_RISING) > + if (cmr & ATMEL_TC_ETRGEDG_RISING) > *action = MCHP_TC_SYNAPSE_ACTION_RISING_EDGE; > else if (cmr & ATMEL_TC_ETRGEDG_FALLING) > *action = MCHP_TC_SYNAPSE_ACTION_FALLING_EDGE; > -- > 2.27.0
The CMR value should be explictly checked for an ATMEL_TC_ETRGEDG_NONE state; this code shouldn't default to a value, but rather return an error if no valid can be determined.
I think this would be better implemented as a switch statement instead, with a default case that returns such an error code.
William Breathitt Gray [unhandled content-type:application/pgp-signature] | |