| Message ID | 20230307065603.2253054-2-u.kleine-koenig@pengutronix.de (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | watchdog: s3c2410_wdt: Simplify using dev_err_probe() | expand |
On Tue, Mar 07, 2023 at 07:56:02AM +0100, Uwe Kleine-König wrote: > This is a preparation for making more use of dev_err_probe(). The idea > is that s3c2410_get_wdt_drv_data() (as it's called only by .probe()) can > make effective use of dev_err_probe() only if it returns an int. For > that the assignment to wdt->drv_data has to happen in the function. The > caller can then just pass on the return value in the error case. > > This seems to be nicer for the compiler: bloatometer reports for an > ARCH=arm s3c6400_defconfig build: > > add/remove: 1/1 grow/shrink: 0/1 up/down: 4/-64 (-60) > Function old new delta > __initcall__kmod_s3c2410_wdt__209_821_s3c2410wdt_driver_init6 - 4 +4 > __initcall__kmod_s3c2410_wdt__209_819_s3c2410wdt_driver_init6 4 - -4 > s3c2410wdt_probe 1332 1272 -60 > > There is no semantical change. (Just one minor difference: Before this > patch wdt->drv_data was always assigned, now that only happens in the > non-error case. That doesn't matter however as *wdt is freed in the > error case.) > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/s3c2410_wdt.c | 22 ++++++++++++---------- > 1 file changed, 12 insertions(+), 10 deletions(-) > > diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c > index 58b262ca4e88..f3de8ef499c3 100644 > --- a/drivers/watchdog/s3c2410_wdt.c > +++ b/drivers/watchdog/s3c2410_wdt.c > @@ -579,8 +579,8 @@ static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt) > return 0; > } > > -static inline const struct s3c2410_wdt_variant * > -s3c2410_get_wdt_drv_data(struct platform_device *pdev) > +static inline int > +s3c2410_get_wdt_drv_data(struct platform_device *pdev, struct s3c2410_wdt *wdt) > { > const struct s3c2410_wdt_variant *variant; > struct device *dev = &pdev->dev; > @@ -603,24 +603,26 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev) > "samsung,cluster-index", &index); > if (err) { > dev_err(dev, "failed to get cluster index\n"); > - return NULL; > + return -EINVAL; > } > > switch (index) { > case 0: > - return variant; > + break; > case 1: > - return (variant == &drv_data_exynos850_cl0) ? > + variant = (variant == &drv_data_exynos850_cl0) ? > &drv_data_exynos850_cl1 : > &drv_data_exynosautov9_cl1; > + break; > default: > dev_err(dev, "wrong cluster index: %u\n", index); > - return NULL; > + return -EINVAL; > } > } > #endif > > - return variant; > + wdt->drv_data = variant; > + return 0; > } > > static void s3c2410wdt_wdt_disable_action(void *data) > @@ -644,9 +646,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev) > spin_lock_init(&wdt->lock); > wdt->wdt_device = s3c2410_wdd; > > - wdt->drv_data = s3c2410_get_wdt_drv_data(pdev); > - if (!wdt->drv_data) > - return -EINVAL; > + ret = s3c2410_get_wdt_drv_data(pdev, wdt); > + if (ret) > + return ret; > > if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) { > wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node, > -- > 2.39.1 >
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 58b262ca4e88..f3de8ef499c3 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -579,8 +579,8 @@ static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt) return 0; } -static inline const struct s3c2410_wdt_variant * -s3c2410_get_wdt_drv_data(struct platform_device *pdev) +static inline int +s3c2410_get_wdt_drv_data(struct platform_device *pdev, struct s3c2410_wdt *wdt) { const struct s3c2410_wdt_variant *variant; struct device *dev = &pdev->dev; @@ -603,24 +603,26 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev) "samsung,cluster-index", &index); if (err) { dev_err(dev, "failed to get cluster index\n"); - return NULL; + return -EINVAL; } switch (index) { case 0: - return variant; + break; case 1: - return (variant == &drv_data_exynos850_cl0) ? + variant = (variant == &drv_data_exynos850_cl0) ? &drv_data_exynos850_cl1 : &drv_data_exynosautov9_cl1; + break; default: dev_err(dev, "wrong cluster index: %u\n", index); - return NULL; + return -EINVAL; } } #endif - return variant; + wdt->drv_data = variant; + return 0; } static void s3c2410wdt_wdt_disable_action(void *data) @@ -644,9 +646,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev) spin_lock_init(&wdt->lock); wdt->wdt_device = s3c2410_wdd; - wdt->drv_data = s3c2410_get_wdt_drv_data(pdev); - if (!wdt->drv_data) - return -EINVAL; + ret = s3c2410_get_wdt_drv_data(pdev, wdt); + if (ret) + return ret; if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) { wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
This is a preparation for making more use of dev_err_probe(). The idea is that s3c2410_get_wdt_drv_data() (as it's called only by .probe()) can make effective use of dev_err_probe() only if it returns an int. For that the assignment to wdt->drv_data has to happen in the function. The caller can then just pass on the return value in the error case. This seems to be nicer for the compiler: bloatometer reports for an ARCH=arm s3c6400_defconfig build: add/remove: 1/1 grow/shrink: 0/1 up/down: 4/-64 (-60) Function old new delta __initcall__kmod_s3c2410_wdt__209_821_s3c2410wdt_driver_init6 - 4 +4 __initcall__kmod_s3c2410_wdt__209_819_s3c2410wdt_driver_init6 4 - -4 s3c2410wdt_probe 1332 1272 -60 There is no semantical change. (Just one minor difference: Before this patch wdt->drv_data was always assigned, now that only happens in the non-error case. That doesn't matter however as *wdt is freed in the error case.) Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> --- drivers/watchdog/s3c2410_wdt.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-)