6.1-stable review patch. If anyone has any objections, please let me know.
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From: Uwe Kleine-König u.kleine-koenig@pengutronix.de
[ Upstream commit 78dca23bd6706dd6a3cdb5c0052f48794b4d2bed ]
This simplifies the code, reduces the number of memory allocations and pointer dereferences.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Reviewed-by: Claudiu Beznea claudiu.beznea@tuxon.dev Signed-off-by: Thierry Reding thierry.reding@gmail.com Stable-dep-of: 37f7707077f5 ("pwm: atmel-tcb: Fix race condition and convert to guards") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pwm/pwm-atmel-tcb.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-)
diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c index 2826fc216d291..ae274bd7907dd 100644 --- a/drivers/pwm/pwm-atmel-tcb.c +++ b/drivers/pwm/pwm-atmel-tcb.c @@ -57,7 +57,7 @@ struct atmel_tcb_pwm_chip { struct clk *clk; struct clk *gclk; struct clk *slow_clk; - struct atmel_tcb_pwm_device *pwms[NPWM]; + struct atmel_tcb_pwm_device pwms[NPWM]; struct atmel_tcb_channel bkup; };
@@ -73,7 +73,7 @@ static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip, enum pwm_polarity polarity) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm]; + struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
tcbpwm->polarity = polarity;
@@ -84,19 +84,13 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm; + struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm]; unsigned cmr; int ret;
- tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL); - if (!tcbpwm) - return -ENOMEM; - ret = clk_prepare_enable(tcbpwmc->clk); - if (ret) { - devm_kfree(chip->dev, tcbpwm); + if (ret) return ret; - }
tcbpwm->polarity = PWM_POLARITY_NORMAL; tcbpwm->duty = 0; @@ -131,25 +125,20 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip, regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr); spin_unlock(&tcbpwmc->lock);
- tcbpwmc->pwms[pwm->hwpwm] = tcbpwm; - return 0; }
static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
clk_disable_unprepare(tcbpwmc->clk); - tcbpwmc->pwms[pwm->hwpwm] = NULL; - devm_kfree(chip->dev, tcbpwm); }
static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm]; + struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm]; unsigned cmr; enum pwm_polarity polarity = tcbpwm->polarity;
@@ -206,7 +195,7 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm]; + struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm]; u32 cmr; enum pwm_polarity polarity = tcbpwm->polarity;
@@ -291,7 +280,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); - struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm]; + struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm]; struct atmel_tcb_pwm_device *atcbpwm = NULL; int i = 0; int slowclk = 0; @@ -338,9 +327,9 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, period = div_u64(period_ns, min);
if (pwm->hwpwm == 0) - atcbpwm = tcbpwmc->pwms[1]; + atcbpwm = &tcbpwmc->pwms[1]; else - atcbpwm = tcbpwmc->pwms[0]; + atcbpwm = &tcbpwmc->pwms[0];
/* * PWM devices provided by the TCB driver are grouped by 2.