lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 9 Nov 2022 13:25:06 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Dmitry Torokhov <dmitry.torokhov@...il.com> Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 5/6] gpiolib: consolidate GPIO lookups On Tue, Nov 08, 2022 at 04:26:50PM -0800, Dmitry Torokhov wrote: > Ensure that all paths to obtain/look up GPIOD from generic > consumer-visible APIs go through the new gpiod_find_and_request() > helper, so that we can easily extend it with support for new firmware > mechanisms. > > The only exception is OF-specific [devm_]gpiod_get_from_of_node() API > that is still being used by a couple of drivers and will be removed as > soon as patches converting them to use generic fwnode/device APIs are > accepted. ... > +static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode, > + struct device *consumer, > + const char *con_id, > + unsigned int idx, > + enum gpiod_flags *flags, > + unsigned long *lookupflags) > { > - unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; > - struct gpio_desc *desc = ERR_PTR(-ENODEV); Not sure why this is needed. Now I see that else branch has been changed, but looking closer to it, we can drop it completely, while leaving this line untouched, correct? > - int ret; > + struct gpio_desc *desc; > > + dev_dbg(consumer, "GPIO lookup for consumer %s in node '%pfw'\n", > + con_id, fwnode); > + > + /* Using device tree? */ > if (is_of_node(fwnode)) { > - desc = gpiod_get_from_of_node(to_of_node(fwnode), > - propname, index, > - dflags, > - label); > - return desc; > + dev_dbg(consumer, "using device tree for GPIO lookup\n"); > + desc = of_find_gpio(to_of_node(fwnode), > + con_id, idx, lookupflags); At least con_id can be placed on the previous line. > } else if (is_acpi_node(fwnode)) { > - desc = acpi_node_get_gpiod(fwnode, propname, index, > - &lflags, &dflags); > - if (IS_ERR(desc)) > - return desc; > + dev_dbg(consumer, "using ACPI for GPIO lookup\n"); > + desc = acpi_find_gpio(fwnode, con_id, idx, flags, lookupflags); > } else { > - return ERR_PTR(-EINVAL); > + desc = ERR_PTR(-ENOENT); > } > > - /* Currently only ACPI takes this path */ > + return desc; > +} ... > + struct gpio_desc *desc = ERR_PTR(-ENOENT); > + unsigned long lookupflags; > + int ret; > + if (!IS_ERR_OR_NULL(fwnode)) I think this is superfluous check. Now in the form of this series, you have only a single dev_dbg() that tries to dereference it. Do we really need to have it there, since every branch has its own dev_dbg() anyway? > + desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, > + &flags, &lookupflags); > + This blank line can be dropped after addressing above. > + if (gpiod_not_found(desc) && platform_lookup_allowed) { > + /* > + * Either we are not using DT or ACPI, or their lookup did not > + * return a result. In that case, use platform lookup as a > + * fallback. > + */ > + dev_dbg(consumer, "using lookup tables for GPIO lookup\n"); > + desc = gpiod_find(consumer, con_id, idx, &lookupflags); > + } > + > + if (IS_ERR(desc)) { > + dev_dbg(consumer, "No GPIO consumer %s found\n", con_id); > + return desc; > + } ... > + return gpiod_find_and_request(NULL, fwnode, con_id, index, flags, label, > + false); One line? ... > + return gpiod_find_and_request(dev, fwnode, con_id, idx, flags, label, > + true); One line? -- With Best Regards, Andy Shevchenko
Powered by blists - more mailing lists