pwm: Manage owner assignment implicitly for drivers

Instead of requiring each driver to care for assigning the owner member of struct pwm_ops, handle that implicitly using a macro. Note that the owner member has to be moved to struct pwm_chip, as the ops structure usually lives in read-only memory and so cannot be modified. The upside is that new low level drivers cannot forget the assignment and save one line each. The pwm-crc driver didn't assign .owner, that's not a problem in practice though as the driver cannot be compiled as a module. Acked-by: Andy Shevchenko <[email protected]> # Intel LPSS Reviewed-by: Florian Fainelli <[email protected]> # pwm-{bcm,brcm}*.c Acked-by: Jernej Skrabec <[email protected]> # sun4i Acked-by: Andi Shyti <[email protected]> Acked-by: Nobuhiro Iwamatsu <[email protected]> # pwm-visconti Acked-by: Heiko Stuebner <[email protected]> # pwm-rockchip Acked-by: Michael Walle <[email protected]> # pwm-sl28cpld Acked-by: Neil Armstrong <[email protected]> # pwm-meson Reviewed-by: Linus Walleij <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Uwe Kleine-König <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
niw · Oct 13, 2023 · 384461a · 384461a
1 parent 7a3663c
commit 384461a
Show file tree

Hide file tree

Showing 68 changed files with 20 additions and 82 deletions.
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
@@ -756,7 +756,6 @@ static const struct pwm_ops mvebu_pwm_ops = {
 	.free = mvebu_pwm_free,
 	.get_state = mvebu_pwm_get_state,
 	.apply = mvebu_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1580,7 +1580,6 @@ static const struct pwm_ops ti_sn_pwm_ops = {
 	.free = ti_sn_pwm_free,
 	.apply = ti_sn_pwm_apply,
 	.get_state = ti_sn_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int ti_sn_pwm_probe(struct auxiliary_device *adev,

diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -1085,7 +1085,6 @@ static const struct pwm_ops lpg_pwm_ops = {
 	.request = lpg_pwm_request,
 	.apply = lpg_pwm_apply,
 	.get_state = lpg_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int lpg_add_pwm(struct lpg *lpg)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
@@ -89,13 +89,13 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
 	if (test_bit(PWMF_REQUESTED, &pwm->flags))
 		return -EBUSY;
 
-	if (!try_module_get(pwm->chip->ops->owner))
+	if (!try_module_get(pwm->chip->owner))
 		return -ENODEV;
 
 	if (pwm->chip->ops->request) {
 		err = pwm->chip->ops->request(pwm->chip, pwm);
 		if (err) {
-			module_put(pwm->chip->ops->owner);
+			module_put(pwm->chip->owner);
 			return err;
 		}
 	}
@@ -253,14 +253,16 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 }
 
 /**
- * pwmchip_add() - register a new PWM chip
+ * __pwmchip_add() - register a new PWM chip
  * @chip: the PWM chip to add
+ * @owner: reference to the module providing the chip.
  *
- * Register a new PWM chip.
+ * Register a new PWM chip. @owner is supposed to be THIS_MODULE, use the
+ * pwmchip_add wrapper to do this right.
  *
  * Returns: 0 on success or a negative error code on failure.
  */
-int pwmchip_add(struct pwm_chip *chip)
+int __pwmchip_add(struct pwm_chip *chip, struct module *owner)
 {
 	struct pwm_device *pwm;
 	unsigned int i;
@@ -272,6 +274,8 @@ int pwmchip_add(struct pwm_chip *chip)
 	if (!pwm_ops_check(chip))
 		return -EINVAL;
 
+	chip->owner = owner;
+
 	chip->pwms = kcalloc(chip->npwm, sizeof(*pwm), GFP_KERNEL);
 	if (!chip->pwms)
 		return -ENOMEM;
@@ -306,7 +310,7 @@ int pwmchip_add(struct pwm_chip *chip)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(pwmchip_add);
+EXPORT_SYMBOL_GPL(__pwmchip_add);
 
 /**
  * pwmchip_remove() - remove a PWM chip
@@ -338,17 +342,17 @@ static void devm_pwmchip_remove(void *data)
 	pwmchip_remove(chip);
 }
 
-int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip)
+int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner)
 {
 	int ret;
 
-	ret = pwmchip_add(chip);
+	ret = __pwmchip_add(chip, owner);
 	if (ret)
 		return ret;
 
 	return devm_add_action_or_reset(dev, devm_pwmchip_remove, chip);
 }
-EXPORT_SYMBOL_GPL(devm_pwmchip_add);
+EXPORT_SYMBOL_GPL(__devm_pwmchip_add);
 
 /**
  * pwm_request_from_chip() - request a PWM device relative to a PWM chip
@@ -979,7 +983,7 @@ void pwm_put(struct pwm_device *pwm)
 	pwm_set_chip_data(pwm, NULL);
 	pwm->label = NULL;
 
-	module_put(pwm->chip->ops->owner);
+	module_put(pwm->chip->owner);
 out:
 	mutex_unlock(&pwm_lock);
 }

diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c
@@ -181,7 +181,6 @@ static int ab8500_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops ab8500_pwm_ops = {
 	.apply = ab8500_pwm_apply,
 	.get_state = ab8500_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int ab8500_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-apple.c b/drivers/pwm/pwm-apple.c
@@ -99,7 +99,6 @@ static int apple_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops apple_pwm_ops = {
 	.apply = apple_pwm_apply,
 	.get_state = apple_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int apple_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -170,7 +170,6 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops atmel_hlcdc_pwm_ops = {
 	.apply = atmel_hlcdc_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_at91sam9x5_errata = {

diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c
@@ -364,7 +364,6 @@ static const struct pwm_ops atmel_tcb_pwm_ops = {
 	.request = atmel_tcb_pwm_request,
 	.free = atmel_tcb_pwm_free,
 	.apply = atmel_tcb_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static struct atmel_tcb_config tcb_rm9200_config = {

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
@@ -402,7 +402,6 @@ static int atmel_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops atmel_pwm_ops = {
 	.apply = atmel_pwm_apply,
 	.get_state = atmel_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static const struct atmel_pwm_data atmel_sam9rl_pwm_data = {

diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
@@ -183,7 +183,6 @@ static int iproc_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops iproc_pwm_ops = {
 	.apply = iproc_pwmc_apply,
 	.get_state = iproc_pwmc_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int iproc_pwmc_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-bcm-kona.c b/drivers/pwm/pwm-bcm-kona.c
@@ -269,7 +269,6 @@ static int kona_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops kona_pwm_ops = {
 	.apply = kona_pwmc_apply,
-	.owner = THIS_MODULE,
 };
 
 static int kona_pwmc_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
@@ -129,7 +129,6 @@ static const struct pwm_ops bcm2835_pwm_ops = {
 	.request = bcm2835_pwm_request,
 	.free = bcm2835_pwm_free,
 	.apply = bcm2835_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int bcm2835_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
@@ -205,7 +205,6 @@ static const struct pwm_ops berlin_pwm_ops = {
 	.request = berlin_pwm_request,
 	.free = berlin_pwm_free,
 	.apply = berlin_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id berlin_pwm_match[] = {

diff --git a/drivers/pwm/pwm-brcmstb.c b/drivers/pwm/pwm-brcmstb.c
@@ -220,7 +220,6 @@ static int brcmstb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops brcmstb_pwm_ops = {
 	.apply = brcmstb_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id brcmstb_pwm_of_match[] = {

diff --git a/drivers/pwm/pwm-clk.c b/drivers/pwm/pwm-clk.c
@@ -77,7 +77,6 @@ static int pwm_clk_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops pwm_clk_ops = {
 	.apply = pwm_clk_apply,
-	.owner = THIS_MODULE,
 };
 
 static int pwm_clk_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
@@ -72,7 +72,6 @@ static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops clps711x_pwm_ops = {
 	.request = clps711x_pwm_request,
 	.apply = clps711x_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,

diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
@@ -241,7 +241,6 @@ static const struct pwm_ops cros_ec_pwm_ops = {
 	.free = cros_ec_pwm_free,
 	.get_state	= cros_ec_pwm_get_state,
 	.apply		= cros_ec_pwm_apply,
-	.owner		= THIS_MODULE,
 };
 
 /*

diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
@@ -195,7 +195,6 @@ static int dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops dwc_pwm_ops = {
 	.apply = dwc_pwm_apply,
 	.get_state = dwc_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)

diff --git a/drivers/pwm/pwm-ep93xx.c b/drivers/pwm/pwm-ep93xx.c
@@ -159,7 +159,6 @@ static const struct pwm_ops ep93xx_pwm_ops = {
 	.request = ep93xx_pwm_request,
 	.free = ep93xx_pwm_free,
 	.apply = ep93xx_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int ep93xx_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c
@@ -350,7 +350,6 @@ static const struct pwm_ops fsl_pwm_ops = {
 	.request = fsl_pwm_request,
 	.free = fsl_pwm_free,
 	.apply = fsl_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int fsl_pwm_init(struct fsl_pwm_chip *fpc)

diff --git a/drivers/pwm/pwm-hibvt.c b/drivers/pwm/pwm-hibvt.c
@@ -185,7 +185,6 @@ static const struct pwm_ops hibvt_pwm_ops = {
 	.get_state = hibvt_pwm_get_state,
 	.apply = hibvt_pwm_apply,
 
-	.owner = THIS_MODULE,
 };
 
 static int hibvt_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
@@ -208,7 +208,6 @@ static int img_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops img_pwm_ops = {
 	.apply = img_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static const struct img_pwm_soc_data pistachio_pwm = {

diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c
@@ -332,7 +332,6 @@ static const struct pwm_ops imx_tpm_pwm_ops = {
 	.free = pwm_imx_tpm_free,
 	.get_state = pwm_imx_tpm_get_state,
 	.apply = pwm_imx_tpm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int pwm_imx_tpm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-imx1.c b/drivers/pwm/pwm-imx1.c
@@ -146,7 +146,6 @@ static int pwm_imx1_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops pwm_imx1_ops = {
 	.apply = pwm_imx1_apply,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id pwm_imx1_dt_ids[] = {

diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c
@@ -296,7 +296,6 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops pwm_imx27_ops = {
 	.apply = pwm_imx27_apply,
 	.get_state = pwm_imx27_get_state,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id pwm_imx27_dt_ids[] = {

diff --git a/drivers/pwm/pwm-intel-lgm.c b/drivers/pwm/pwm-intel-lgm.c
@@ -107,7 +107,6 @@ static int lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops lgm_pwm_ops = {
 	.get_state = lgm_pwm_get_state,
 	.apply = lgm_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static void lgm_pwm_init(struct lgm_pwm_chip *pc)

diff --git a/drivers/pwm/pwm-iqs620a.c b/drivers/pwm/pwm-iqs620a.c
@@ -166,7 +166,6 @@ static int iqs620_pwm_notifier(struct notifier_block *notifier,
 static const struct pwm_ops iqs620_pwm_ops = {
 	.apply = iqs620_pwm_apply,
 	.get_state = iqs620_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static void iqs620_pwm_notifier_unregister(void *context)

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
@@ -216,7 +216,6 @@ static const struct pwm_ops jz4740_pwm_ops = {
 	.request = jz4740_pwm_request,
 	.free = jz4740_pwm_free,
 	.apply = jz4740_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int jz4740_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-keembay.c b/drivers/pwm/pwm-keembay.c
@@ -178,7 +178,6 @@ static int keembay_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 }
 
 static const struct pwm_ops keembay_pwm_ops = {
-	.owner = THIS_MODULE,
 	.apply = keembay_pwm_apply,
 	.get_state = keembay_pwm_get_state,
 };

diff --git a/drivers/pwm/pwm-lp3943.c b/drivers/pwm/pwm-lp3943.c
@@ -216,7 +216,6 @@ static const struct pwm_ops lp3943_pwm_ops = {
 	.request	= lp3943_pwm_request,
 	.free		= lp3943_pwm_free,
 	.apply		= lp3943_pwm_apply,
-	.owner		= THIS_MODULE,
 };
 
 static int lp3943_pwm_parse_dt(struct device *dev,

diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c
@@ -341,7 +341,6 @@ static const struct pwm_ops lpc18xx_pwm_ops = {
 	.apply = lpc18xx_pwm_apply,
 	.request = lpc18xx_pwm_request,
 	.free = lpc18xx_pwm_free,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id lpc18xx_pwm_of_match[] = {

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
@@ -115,7 +115,6 @@ static int lpc32xx_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops lpc32xx_pwm_ops = {
 	.apply = lpc32xx_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int lpc32xx_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
@@ -243,7 +243,6 @@ static int pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops pwm_lpss_ops = {
 	.apply = pwm_lpss_apply,
 	.get_state = pwm_lpss_get_state,
-	.owner = THIS_MODULE,
 };
 
 struct pwm_lpss_chip *devm_pwm_lpss_probe(struct device *dev, void __iomem *base,

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
@@ -229,7 +229,6 @@ static int pwm_mediatek_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops pwm_mediatek_ops = {
 	.apply = pwm_mediatek_apply,
-	.owner = THIS_MODULE,
 };
 
 static int pwm_mediatek_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
@@ -335,7 +335,6 @@ static const struct pwm_ops meson_pwm_ops = {
 	.free = meson_pwm_free,
 	.apply = meson_pwm_apply,
 	.get_state = meson_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static const char * const pwm_meson8b_parent_names[] = {

diff --git a/drivers/pwm/pwm-microchip-core.c b/drivers/pwm/pwm-microchip-core.c
@@ -435,7 +435,6 @@ static int mchp_core_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm
 static const struct pwm_ops mchp_core_pwm_ops = {
 	.apply = mchp_core_pwm_apply,
 	.get_state = mchp_core_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static const struct of_device_id mchp_core_of_match[] = {

diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
@@ -227,7 +227,6 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
 static const struct pwm_ops mtk_disp_pwm_ops = {
 	.apply = mtk_disp_pwm_apply,
 	.get_state = mtk_disp_pwm_get_state,
-	.owner = THIS_MODULE,
 };
 
 static int mtk_disp_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
@@ -115,7 +115,6 @@ static int mxs_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 static const struct pwm_ops mxs_pwm_ops = {
 	.apply = mxs_pwm_apply,
-	.owner = THIS_MODULE,
 };
 
 static int mxs_pwm_probe(struct platform_device *pdev)

diff --git a/drivers/pwm/pwm-ntxec.c b/drivers/pwm/pwm-ntxec.c
@@ -126,7 +126,6 @@ static int ntxec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm_dev,
 }
 
 static const struct pwm_ops ntxec_pwm_ops = {
-	.owner = THIS_MODULE,
 	.apply = ntxec_pwm_apply,
 	/*
 	 * No .get_state callback, because the current state cannot be read

diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
@@ -311,7 +311,6 @@ static int pwm_omap_dmtimer_apply(struct pwm_chip *chip,
 
 static const struct pwm_ops pwm_omap_dmtimer_ops = {
 	.apply = pwm_omap_dmtimer_apply,
-	.owner = THIS_MODULE,
 };
 
 static int pwm_omap_dmtimer_probe(struct platform_device *pdev)