From 472a1482325b3a285e0bcf82c0b0edc689b7e8cd Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Sun, 2 Oct 2022 08:04:19 -0400 Subject: [PATCH 1/4] counter: Reduce DEFINE_COUNTER_ARRAY_POLARITY() to defining counter_array A spare warning was reported for drivers/counter/ti-ecap-capture.c:: sparse warnings: (new ones prefixed by >>) >> drivers/counter/ti-ecap-capture.c:380:8: sparse: sparse: symbol 'ecap_cnt_pol_array' was not declared. Should it be static? vim +/ecap_cnt_pol_array +380 drivers/counter/ti-ecap-capture.c 379 > 380 static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_avail, ECAP_NB_CEVT); 381 The first argument to the DEFINE_COUNTER_ARRAY_POLARITY() macro is a token serving as the symbol name in the definition of a new struct counter_array structure. However, this macro actually expands to two statements:: #define DEFINE_COUNTER_ARRAY_POLARITY(_name, _enums, _length) \ DEFINE_COUNTER_AVAILABLE(_name##_available, _enums); \ struct counter_array _name = { \ .type = COUNTER_COMP_SIGNAL_POLARITY, \ .avail = &(_name##_available), \ .length = (_length), \ } Because of this, the "static" on line 380 only applies to the first statement. This patch splits out the DEFINE_COUNTER_AVAILABLE() line and leaves DEFINE_COUNTER_ARRAY_POLARITY() as a simple structure definition to avoid issues like this. Reported-by: kernel test robot Link: https://lore.kernel.org/all/202210020619.NQbyomII-lkp@intel.com/ Cc: Julien Panis Signed-off-by: William Breathitt Gray --- drivers/counter/ti-ecap-capture.c | 3 ++- include/linux/counter.h | 5 ++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/counter/ti-ecap-capture.c b/drivers/counter/ti-ecap-capture.c index af10de30aba51..b8dbf0212a8e7 100644 --- a/drivers/counter/ti-ecap-capture.c +++ b/drivers/counter/ti-ecap-capture.c @@ -377,7 +377,8 @@ static const enum counter_signal_polarity ecap_cnt_pol_avail[] = { COUNTER_SIGNAL_POLARITY_NEGATIVE, }; -static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_avail, ECAP_NB_CEVT); +static DEFINE_COUNTER_AVAILABLE(ecap_cnt_pol_available, ecap_cnt_pol_avail); +static DEFINE_COUNTER_ARRAY_POLARITY(ecap_cnt_pol_array, ecap_cnt_pol_available, ECAP_NB_CEVT); static struct counter_comp ecap_cnt_signal_ext[] = { COUNTER_COMP_ARRAY_POLARITY(ecap_cnt_pol_read, ecap_cnt_pol_write, ecap_cnt_pol_array), diff --git a/include/linux/counter.h b/include/linux/counter.h index c41fa602ed283..b63746637de2a 100644 --- a/include/linux/counter.h +++ b/include/linux/counter.h @@ -542,11 +542,10 @@ struct counter_array { #define DEFINE_COUNTER_ARRAY_CAPTURE(_name, _length) \ DEFINE_COUNTER_ARRAY_U64(_name, _length) -#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _enums, _length) \ - DEFINE_COUNTER_AVAILABLE(_name##_available, _enums); \ +#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _available, _length) \ struct counter_array _name = { \ .type = COUNTER_COMP_SIGNAL_POLARITY, \ - .avail = &(_name##_available), \ + .avail = &(_available), \ .length = (_length), \ } From ec0286dce78c3bb0e6a665c0baade2f2db56ce00 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Wed, 12 Oct 2022 17:51:25 +0300 Subject: [PATCH 2/4] counter: ti-ecap-capture: fix IS_ERR() vs NULL check The devm_counter_alloc() function returns NULL on error. It doesn't return error pointers. Fixes: 4e2f42aa00b6 ("counter: ti-ecap-capture: capture driver support for ECAP") Signed-off-by: Dan Carpenter Reviewed-by: Julien Panis Acked-by: Vignesh Raghavendra Link: https://lore.kernel.org/r/Y0bUbZvfDJHBG9C6@kili/ Signed-off-by: William Breathitt Gray --- drivers/counter/ti-ecap-capture.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/counter/ti-ecap-capture.c b/drivers/counter/ti-ecap-capture.c index b8dbf0212a8e7..fb1cb1774674a 100644 --- a/drivers/counter/ti-ecap-capture.c +++ b/drivers/counter/ti-ecap-capture.c @@ -480,8 +480,8 @@ static int ecap_cnt_probe(struct platform_device *pdev) int ret; counter_dev = devm_counter_alloc(dev, sizeof(*ecap_dev)); - if (IS_ERR(counter_dev)) - return PTR_ERR(counter_dev); + if (!counter_dev) + return -ENOMEM; counter_dev->name = ECAP_DRV_NAME; counter_dev->parent = dev; From d917a62af81b133f35f627e7936e193c842a7947 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Tue, 18 Oct 2022 08:10:14 -0400 Subject: [PATCH 3/4] counter: microchip-tcb-capture: Handle Signal1 read and Synapse The signal_read(), action_read(), and action_write() callbacks have been assuming Signal0 is requested without checking. This results in requests for Signal1 returning data for Signal0. This patch fixes these oversights by properly checking for the Signal's id in the respective callbacks and handling accordingly based on the particular Signal requested. The trig_inverted member of the mchp_tc_data is removed as superfluous. Fixes: 106b104137fd ("counter: Add microchip TCB capture counter") Cc: stable@vger.kernel.org Reviewed-by: Kamel Bouhara Link: https://lore.kernel.org/r/20221018121014.7368-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray --- drivers/counter/microchip-tcb-capture.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/counter/microchip-tcb-capture.c b/drivers/counter/microchip-tcb-capture.c index f9dee15d97776..e2d1dc6ca6682 100644 --- a/drivers/counter/microchip-tcb-capture.c +++ b/drivers/counter/microchip-tcb-capture.c @@ -28,7 +28,6 @@ struct mchp_tc_data { int qdec_mode; int num_channels; int channel[2]; - bool trig_inverted; }; static const enum counter_function mchp_tc_count_functions[] = { @@ -153,7 +152,7 @@ static int mchp_tc_count_signal_read(struct counter_device *counter, regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], SR), &sr); - if (priv->trig_inverted) + if (signal->id == 1) sigstatus = (sr & ATMEL_TC_MTIOB); else sigstatus = (sr & ATMEL_TC_MTIOA); @@ -171,6 +170,17 @@ static int mchp_tc_count_action_read(struct counter_device *counter, struct mchp_tc_data *const priv = counter_priv(counter); u32 cmr; + if (priv->qdec_mode) { + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; + return 0; + } + + /* Only TIOA signal is evaluated in non-QDEC mode */ + if (synapse->signal->id != 0) { + *action = COUNTER_SYNAPSE_ACTION_NONE; + return 0; + } + regmap_read(priv->regmap, ATMEL_TC_REG(priv->channel[0], CMR), &cmr); switch (cmr & ATMEL_TC_ETRGEDG) { @@ -199,8 +209,8 @@ static int mchp_tc_count_action_write(struct counter_device *counter, struct mchp_tc_data *const priv = counter_priv(counter); u32 edge = ATMEL_TC_ETRGEDG_NONE; - /* QDEC mode is rising edge only */ - if (priv->qdec_mode) + /* QDEC mode is rising edge only; only TIOA handled in non-QDEC mode */ + if (priv->qdec_mode || synapse->signal->id != 0) return -EINVAL; switch (action) { From d501d37841d3b7f18402d71a9ef057eb9dde127e Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Thu, 20 Oct 2022 10:11:21 -0400 Subject: [PATCH 4/4] counter: 104-quad-8: Fix race getting function mode and direction The quad8_action_read() function checks the Count function mode and Count direction without first acquiring a lock. This is a race condition because the function mode could change by the time the direction is checked. Because the quad8_function_read() already acquires a lock internally, the quad8_function_read() is refactored to spin out the no-lock code to a new quad8_function_get() function. To resolve the race condition in quad8_action_read(), a lock is acquired before calling quad8_function_get() and quad8_direction_read() in order to get both function mode and direction atomically. Fixes: f1d8a071d45b ("counter: 104-quad-8: Add Generic Counter interface support") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20221020141121.15434-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray --- drivers/counter/104-quad-8.c | 64 +++++++++++++++++++++++------------- 1 file changed, 42 insertions(+), 22 deletions(-) diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index 77a863b7eefea..deed4afadb298 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -232,34 +232,45 @@ static const enum counter_function quad8_count_functions_list[] = { COUNTER_FUNCTION_QUADRATURE_X4, }; +static int quad8_function_get(const struct quad8 *const priv, const size_t id, + enum counter_function *const function) +{ + if (!priv->quadrature_mode[id]) { + *function = COUNTER_FUNCTION_PULSE_DIRECTION; + return 0; + } + + switch (priv->quadrature_scale[id]) { + case 0: + *function = COUNTER_FUNCTION_QUADRATURE_X1_A; + return 0; + case 1: + *function = COUNTER_FUNCTION_QUADRATURE_X2_A; + return 0; + case 2: + *function = COUNTER_FUNCTION_QUADRATURE_X4; + return 0; + default: + /* should never reach this path */ + return -EINVAL; + } +} + static int quad8_function_read(struct counter_device *counter, struct counter_count *count, enum counter_function *function) { struct quad8 *const priv = counter_priv(counter); - const int id = count->id; unsigned long irqflags; + int retval; spin_lock_irqsave(&priv->lock, irqflags); - if (priv->quadrature_mode[id]) - switch (priv->quadrature_scale[id]) { - case 0: - *function = COUNTER_FUNCTION_QUADRATURE_X1_A; - break; - case 1: - *function = COUNTER_FUNCTION_QUADRATURE_X2_A; - break; - case 2: - *function = COUNTER_FUNCTION_QUADRATURE_X4; - break; - } - else - *function = COUNTER_FUNCTION_PULSE_DIRECTION; + retval = quad8_function_get(priv, count->id, function); spin_unlock_irqrestore(&priv->lock, irqflags); - return 0; + return retval; } static int quad8_function_write(struct counter_device *counter, @@ -359,6 +370,7 @@ static int quad8_action_read(struct counter_device *counter, enum counter_synapse_action *action) { struct quad8 *const priv = counter_priv(counter); + unsigned long irqflags; int err; enum counter_function function; const size_t signal_a_id = count->synapses[0].signal->id; @@ -374,9 +386,21 @@ static int quad8_action_read(struct counter_device *counter, return 0; } - err = quad8_function_read(counter, count, &function); - if (err) + spin_lock_irqsave(&priv->lock, irqflags); + + /* Get Count function and direction atomically */ + err = quad8_function_get(priv, count->id, &function); + if (err) { + spin_unlock_irqrestore(&priv->lock, irqflags); + return err; + } + err = quad8_direction_read(counter, count, &direction); + if (err) { + spin_unlock_irqrestore(&priv->lock, irqflags); return err; + } + + spin_unlock_irqrestore(&priv->lock, irqflags); /* Default action mode */ *action = COUNTER_SYNAPSE_ACTION_NONE; @@ -389,10 +413,6 @@ static int quad8_action_read(struct counter_device *counter, return 0; case COUNTER_FUNCTION_QUADRATURE_X1_A: if (synapse->signal->id == signal_a_id) { - err = quad8_direction_read(counter, count, &direction); - if (err) - return err; - if (direction == COUNTER_COUNT_DIRECTION_FORWARD) *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; else