| Message ID | 20240504-pinctrl-cleanup-v2-4-26c5f2dc1181@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pinctrl: Use scope based of_node_put() cleanups | expand |
> Use scope based of_node_put() cleanup to simplify code. I see opportunities to improve affected function implementations another bit. … > +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c … > @@ -543,18 +540,18 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, > pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); > if (!pins) { > ret = -ENOMEM; > - goto put_child; > + goto free_map; > } > > pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); > if (!pinmux) { > ret = -ENOMEM; > - goto put_child; > + goto free_map; > } … > @@ -623,8 +620,6 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, > mutex_unlock(&sfp->mutex); > return 0; > > -put_child: > - of_node_put(child); > free_map: > pinctrl_utils_free_map(pctldev, map, nmaps); > mutex_unlock(&sfp->mutex); … > +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c … > @@ -175,18 +175,18 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, > pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); > if (!pins) { > ret = -ENOMEM; > - goto put_child; > + goto free_map; > } > > pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); > if (!pinmux) { > ret = -ENOMEM; > - goto put_child; > + goto free_map; > } … > @@ -233,8 +233,6 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, > *num_maps = nmaps; > return 0; > > -put_child: > - of_node_put(child); > free_map: > pinctrl_utils_free_map(pctldev, map, nmaps); > mutex_unlock(&sfp->mutex); 1. Exception handling is repeated a few times also according to memory allocation failures. How do you think about to use a corresponding label like “e_nomem” so that another bit of duplicate source code can be avoided? https://wiki.sei.cmu.edu/confluence/display/c/MEM12-C.+Consider+using+a+goto+chain+when+leaving+a+function+on+error+when+using+and+releasing+resources 2. Will development interests grow for the usage of a statement like “guard(mutex)(&sfp->mutex);”? Regards, Markus
Hi Markus > Subject: Re: [PATCH v2 04/20] pinctrl: starfive: Use scope based of_node_put() > cleanups > > > Use scope based of_node_put() cleanup to simplify code. > > I see opportunities to improve affected function implementations another bit. > > > ... > > +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c > ... > > @@ -543,18 +540,18 @@ static int starfive_dt_node_to_map(struct > pinctrl_dev *pctldev, > > pins = devm_kcalloc(dev, npins, sizeof(*pins), > GFP_KERNEL); > > if (!pins) { > > ret = -ENOMEM; > > - goto put_child; > > + goto free_map; > > } > > > > pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), > GFP_KERNEL); > > if (!pinmux) { > > ret = -ENOMEM; > > - goto put_child; > > + goto free_map; > > } > ... > > @@ -623,8 +620,6 @@ static int starfive_dt_node_to_map(struct > pinctrl_dev *pctldev, > > mutex_unlock(&sfp->mutex); > > return 0; > > > > -put_child: > > - of_node_put(child); > > free_map: > > pinctrl_utils_free_map(pctldev, map, nmaps); > > mutex_unlock(&sfp->mutex); > ... > > +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c > ... > > @@ -175,18 +175,18 @@ static int jh7110_dt_node_to_map(struct > pinctrl_dev *pctldev, > > pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); > > if (!pins) { > > ret = -ENOMEM; > > - goto put_child; > > + goto free_map; > > } > > > > pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), > GFP_KERNEL); > > if (!pinmux) { > > ret = -ENOMEM; > > - goto put_child; > > + goto free_map; > > } > ... > > @@ -233,8 +233,6 @@ static int jh7110_dt_node_to_map(struct > pinctrl_dev *pctldev, > > *num_maps = nmaps; > > return 0; > > > > -put_child: > > - of_node_put(child); > > free_map: > > pinctrl_utils_free_map(pctldev, map, nmaps); > > mutex_unlock(&sfp->mutex); > > > 1. Exception handling is repeated a few times also according to memory > allocation failures. > How do you think about to use a corresponding label like "e_nomem" > so that another bit of duplicate source code can be avoided? I have no plan to rework this series for non-accepted patches. If you have interest and time, feel free to take it. > > https://wiki.se/ > i.cmu.edu%2Fconfluence%2Fdisplay%2Fc%2FMEM12- > C.%2BConsider%2Busing%2Ba%2Bgoto%2Bchain%2Bwhen%2Bleaving%2Ba% > 2Bfunction%2Bon%2Berror%2Bwhen%2Busing%2Band%2Breleasing%2Bresou > rces&data=05%7C02%7Cpeng.fan%40nxp.com%7C293bafdf40524fa4655b08 > dc7e58f6b2%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63852 > 4167804502915%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL > CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata > =Kb5cz6sVxW1TNfQ8MM2F6YLIIztyjvW4wULEJLYKRM8%3D&reserved=0 > > 2. Will development interests grow for the usage of a statement like > "guard(mutex)(&sfp->mutex);"? I have no plan on this. Thanks, Peng. > > > Regards, > Markus
>> 1. Exception handling is repeated a few times also according to memory >> allocation failures. >> How do you think about to use a corresponding label like "e_nomem" >> so that another bit of duplicate source code can be avoided? > > I have no plan to rework this series for non-accepted patches. If you have > interest and time, feel free to take it. >> >> https://wiki.se/ >> i.cmu.edu%2Fconfluence%2Fdisplay%2Fc%2FMEM12- >> C.%2BConsider%2Busing%2Ba%2Bgoto%2Bchain%2Bwhen%2Bleaving%2Ba% >> 2Bfunction%2Bon%2Berror%2Bwhen%2Busing%2Band%2Breleasing%2Bresou >> rces&data=05%7C02%7Cpeng.fan%40nxp.com%7C293bafdf40524fa4655b08 >> dc7e58f6b2%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63852 >> 4167804502915%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL >> CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata >> =Kb5cz6sVxW1TNfQ8MM2F6YLIIztyjvW4wULEJLYKRM8%3D&reserved=0 I became curious how the change acceptance will evolve further also according to such a code transformation possibility. >> 2. Will development interests grow for the usage of a statement like >> "guard(mutex)(&sfp->mutex);"? > > I have no plan on this. Other contributors might get attracted by corresponding design adjustments. https://elixir.bootlin.com/linux/v6.10-rc1/source/include/linux/cleanup.h#L124 See also: Looking at guard usage (with SmPL) https://lore.kernel.org/cocci/2dc6a1c7-79bf-42e3-95cc-599a1e154f57@web.de/ https://sympa.inria.fr/sympa/arc/cocci/2024-05/msg00090.html Regards, Markus
diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c b/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c index 6df7a310c7ed..27f99183d994 100644 --- a/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7100.c @@ -480,7 +480,6 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, { struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); struct device *dev = sfp->gc.parent; - struct device_node *child; struct pinctrl_map *map; const char **pgnames; const char *grpname; @@ -492,20 +491,18 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, nmaps = 0; ngroups = 0; - for_each_available_child_of_node(np, child) { + for_each_available_child_of_node_scoped(np, child) { int npinmux = of_property_count_u32_elems(child, "pinmux"); int npins = of_property_count_u32_elems(child, "pins"); if (npinmux > 0 && npins > 0) { dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: both pinmux and pins set\n", np, child); - of_node_put(child); return -EINVAL; } if (npinmux == 0 && npins == 0) { dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: neither pinmux nor pins set\n", np, child); - of_node_put(child); return -EINVAL; } @@ -527,14 +524,14 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, nmaps = 0; ngroups = 0; mutex_lock(&sfp->mutex); - for_each_available_child_of_node(np, child) { + for_each_available_child_of_node_scoped(np, child) { int npins; int i; grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child); if (!grpname) { ret = -ENOMEM; - goto put_child; + goto free_map; } pgnames[ngroups++] = grpname; @@ -543,18 +540,18 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); if (!pins) { ret = -ENOMEM; - goto put_child; + goto free_map; } pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); if (!pinmux) { ret = -ENOMEM; - goto put_child; + goto free_map; } ret = of_property_read_u32_array(child, "pinmux", pinmux, npins); if (ret) - goto put_child; + goto free_map; for (i = 0; i < npins; i++) { unsigned int gpio = starfive_pinmux_to_gpio(pinmux[i]); @@ -570,7 +567,7 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); if (!pins) { ret = -ENOMEM; - goto put_child; + goto free_map; } pinmux = NULL; @@ -580,18 +577,18 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, ret = of_property_read_u32_index(child, "pins", i, &v); if (ret) - goto put_child; + goto free_map; pins[i] = v; } } else { ret = -EINVAL; - goto put_child; + goto free_map; } ret = pinctrl_generic_add_group(pctldev, grpname, pins, npins, pinmux); if (ret < 0) { dev_err(dev, "error adding group %s: %d\n", grpname, ret); - goto put_child; + goto free_map; } ret = pinconf_generic_parse_dt_config(child, pctldev, @@ -600,7 +597,7 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, if (ret) { dev_err(dev, "error parsing pin config of group %s: %d\n", grpname, ret); - goto put_child; + goto free_map; } /* don't create a map if there are no pinconf settings */ @@ -623,8 +620,6 @@ static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev, mutex_unlock(&sfp->mutex); return 0; -put_child: - of_node_put(child); free_map: pinctrl_utils_free_map(pctldev, map, nmaps); mutex_unlock(&sfp->mutex); diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c index 9609eb1ecc3d..4ce080caa233 100644 --- a/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c @@ -150,7 +150,7 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, nmaps = 0; ngroups = 0; mutex_lock(&sfp->mutex); - for_each_available_child_of_node(np, child) { + for_each_available_child_of_node_scoped(np, child) { int npins = of_property_count_u32_elems(child, "pinmux"); int *pins; u32 *pinmux; @@ -161,13 +161,13 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, "invalid pinctrl group %pOFn.%pOFn: pinmux not set\n", np, child); ret = -EINVAL; - goto put_child; + goto free_map; } grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child); if (!grpname) { ret = -ENOMEM; - goto put_child; + goto free_map; } pgnames[ngroups++] = grpname; @@ -175,18 +175,18 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); if (!pins) { ret = -ENOMEM; - goto put_child; + goto free_map; } pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); if (!pinmux) { ret = -ENOMEM; - goto put_child; + goto free_map; } ret = of_property_read_u32_array(child, "pinmux", pinmux, npins); if (ret) - goto put_child; + goto free_map; for (i = 0; i < npins; i++) pins[i] = jh7110_pinmux_pin(pinmux[i]); @@ -200,7 +200,7 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, pins, npins, pinmux); if (ret < 0) { dev_err(dev, "error adding group %s: %d\n", grpname, ret); - goto put_child; + goto free_map; } ret = pinconf_generic_parse_dt_config(child, pctldev, @@ -209,7 +209,7 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, if (ret) { dev_err(dev, "error parsing pin config of group %s: %d\n", grpname, ret); - goto put_child; + goto free_map; } /* don't create a map if there are no pinconf settings */ @@ -233,8 +233,6 @@ static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, *num_maps = nmaps; return 0; -put_child: - of_node_put(child); free_map: pinctrl_utils_free_map(pctldev, map, nmaps); mutex_unlock(&sfp->mutex);