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Mon, 22 Mar 2021 17:26:18 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id BCEA810002A; Mon, 22 Mar 2021 17:26:17 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id AB4EE22F114; Mon, 22 Mar 2021 17:26:17 +0100 (CET) Received: from [10.211.8.180] (10.75.127.48) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 22 Mar 2021 17:26:16 +0100 Subject: Re: [Linux-stm32] [PATCH v10 18/33] counter: Return error code on invalid modes To: William Breathitt Gray , CC: , , , , , , , , , , , , , , References: From: Fabrice Gasnier Message-ID: <91f41020-d042-e69a-e1e8-ef4a0ebe4bf8@foss.st.com> Date: Mon, 22 Mar 2021 17:26:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG2NODE3.st.com (10.75.127.6) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-03-22_08:2021-03-22, 2021-03-22 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210322_162718_056351_5F0050B2 X-CRM114-Status: GOOD ( 28.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/19/21 12:00 PM, William Breathitt Gray wrote: > Only a select set of modes (function, action, etc.) are valid for a > given device configuration. This patch ensures that invalid modes result > in a return -EINVAL. Such a situation should never occur in reality, but > it's good to define a default switch cases for the sake of making the > intent of the code clear. > > Cc: Syed Nayyar Waris > Cc: Kamel Bouhara > Cc: Fabrice Gasnier > Cc: Maxime Coquelin > Cc: Alexandre Torgue > Cc: David Lechner > Signed-off-by: William Breathitt Gray > --- > drivers/counter/104-quad-8.c | 20 +++++++---- > drivers/counter/microchip-tcb-capture.c | 6 ++++ > drivers/counter/stm32-lptimer-cnt.c | 10 +++--- Hi William, Fro the STM32 driver, You can add my: Reviewed-by: Fabrice Gasnier Thanks, Fabrice > drivers/counter/ti-eqep.c | 45 +++++++++++-------------- > 4 files changed, 46 insertions(+), 35 deletions(-) > > diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c > index 09d779544969..b7d6c1c43655 100644 > --- a/drivers/counter/104-quad-8.c > +++ b/drivers/counter/104-quad-8.c > @@ -273,6 +273,10 @@ static int quad8_function_set(struct counter_device *counter, > *scale = 2; > mode_cfg |= QUAD8_CMR_QUADRATURE_X4; > break; > + default: > + /* should never reach this path */ > + mutex_unlock(&priv->lock); > + return -EINVAL; > } > } > > @@ -349,7 +353,7 @@ static int quad8_action_get(struct counter_device *counter, > case QUAD8_COUNT_FUNCTION_PULSE_DIRECTION: > if (synapse->signal->id == signal_a_id) > *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE; > - break; > + return 0; > case QUAD8_COUNT_FUNCTION_QUADRATURE_X1: > if (synapse->signal->id == signal_a_id) { > quad8_direction_get(counter, count, &direction); > @@ -359,17 +363,18 @@ static int quad8_action_get(struct counter_device *counter, > else > *action = QUAD8_SYNAPSE_ACTION_FALLING_EDGE; > } > - break; > + return 0; > case QUAD8_COUNT_FUNCTION_QUADRATURE_X2: > if (synapse->signal->id == signal_a_id) > *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES; > - break; > + return 0; > case QUAD8_COUNT_FUNCTION_QUADRATURE_X4: > *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES; > - break; > + return 0; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > - > - return 0; > } > > static const struct counter_ops quad8_ops = { > @@ -529,6 +534,9 @@ static int quad8_count_mode_set(struct counter_device *counter, > case COUNTER_COUNT_MODE_MODULO_N: > cnt_mode = 3; > break; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > > mutex_lock(&priv->lock); > diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c > index 51b8af80f98b..0c9a61962911 100644 > --- a/drivers/counter/microchip-tcb-capture.c > +++ b/drivers/counter/microchip-tcb-capture.c > @@ -133,6 +133,9 @@ static int mchp_tc_count_function_set(struct counter_device *counter, > bmr |= ATMEL_TC_QDEN | ATMEL_TC_POSEN; > cmr |= ATMEL_TC_ETRGEDG_RISING | ATMEL_TC_ABETRG | ATMEL_TC_XC0; > break; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > > regmap_write(priv->regmap, ATMEL_TC_BMR, bmr); > @@ -226,6 +229,9 @@ static int mchp_tc_count_action_set(struct counter_device *counter, > case MCHP_TC_SYNAPSE_ACTION_BOTH_EDGE: > edge = ATMEL_TC_ETRGEDG_BOTH; > break; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > > return regmap_write_bits(priv->regmap, > diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c > index c19d998df5ba..78f383b77bd2 100644 > --- a/drivers/counter/stm32-lptimer-cnt.c > +++ b/drivers/counter/stm32-lptimer-cnt.c > @@ -206,9 +206,10 @@ static int stm32_lptim_cnt_function_set(struct counter_device *counter, > priv->quadrature_mode = 1; > priv->polarity = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES; > return 0; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > - > - return -EINVAL; > } > > static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter, > @@ -326,9 +327,10 @@ static int stm32_lptim_cnt_action_get(struct counter_device *counter, > case STM32_LPTIM_ENCODER_BOTH_EDGE: > *action = priv->polarity; > return 0; > + default: > + /* should never reach this path */ > + return -EINVAL; > } > - > - return -EINVAL; > } > > static int stm32_lptim_cnt_action_set(struct counter_device *counter, > diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c > index 65df9ef5b5bc..878725c2f010 100644 > --- a/drivers/counter/ti-eqep.c > +++ b/drivers/counter/ti-eqep.c > @@ -157,44 +157,39 @@ static int ti_eqep_action_get(struct counter_device *counter, > * QEPA and QEPB trigger QCLK. > */ > *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES; > - break; > + return 0; > case TI_EQEP_COUNT_FUNC_DIR_COUNT: > /* In direction-count mode only rising edge of QEPA is counted > * and QEPB gives direction. > */ > - switch (synapse->signal->id) { > - case TI_EQEP_SIGNAL_QEPA: > - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; > - break; > - default: > + if (synapse->signal->id == TI_EQEP_SIGNAL_QEPB) > *action = TI_EQEP_SYNAPSE_ACTION_NONE; > - break; > - } > - break; > + else > + *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; > + return 0; > case TI_EQEP_COUNT_FUNC_UP_COUNT: > case TI_EQEP_COUNT_FUNC_DOWN_COUNT: > /* In up/down-count modes only QEPA is counted and QEPB is not > * used. > */ > - switch (synapse->signal->id) { > - case TI_EQEP_SIGNAL_QEPA: > - err = regmap_read(priv->regmap16, QDECCTL, &qdecctl); > - if (err) > - return err; > - > - if (qdecctl & QDECCTL_XCR) > - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES; > - else > - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; > - break; > - default: > + if (synapse->signal->id == TI_EQEP_SIGNAL_QEPB) { > *action = TI_EQEP_SYNAPSE_ACTION_NONE; > - break; > + return 0; > } > - break; > - } > > - return 0; > + err = regmap_read(priv->regmap16, QDECCTL, &qdecctl); > + if (err) > + return err; > + > + if (qdecctl & QDECCTL_XCR) > + *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES; > + else > + *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE; > + return 0; > + default: > + /* should never reach this path */ > + return -EINVAL; > + } > } > > static const struct counter_ops ti_eqep_counter_ops = { > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel