#ifndef _ASM_GENERIC_GPIO_H #define _ASM_GENERIC_GPIO_H #include #include #include #include #ifdef CONFIG_GPIOLIB #include #include #include /* Platforms may implement their GPIO interface with library code, * at a small performance cost for non-inlined operations and some * extra memory (for code and for per-GPIO table entries). * * While the GPIO programming interface defines valid GPIO numbers * to be in the range 0..MAX_INT, this library restricts them to the * smaller range 0..ARCH_NR_GPIOS-1. * * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is * actually an estimate of a board-specific value. */ #ifndef ARCH_NR_GPIOS #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0 #define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO #else #define ARCH_NR_GPIOS 512 #endif #endif /* * "valid" GPIO numbers are nonnegative and may be passed to * setup routines like gpio_request(). only some valid numbers * can successfully be requested and used. * * Invalid GPIO numbers are useful for indicating no-such-GPIO in * platform data and other tables. */ static inline bool gpio_is_valid(int number) { return number >= 0 && number < ARCH_NR_GPIOS; } struct device; struct gpio; struct seq_file; struct module; struct device_node; struct gpio_desc; /* caller holds gpio_lock *OR* gpio is marked as requested */ static inline struct gpio_chip *gpio_to_chip(unsigned gpio) { return gpiod_to_chip(gpio_to_desc(gpio)); } /* Always use the library code for GPIO management calls, * or when sleeping may be involved. */ extern int gpio_request(unsigned gpio, const char *label); extern void gpio_free(unsigned gpio); static inline int gpio_direction_input(unsigned gpio) { return gpiod_direction_input(gpio_to_desc(gpio)); } static inline int gpio_direction_output(unsigned gpio, int value) { return gpiod_direction_output_raw(gpio_to_desc(gpio), value); } static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) { return gpiod_set_debounce(gpio_to_desc(gpio), debounce); } static inline int gpio_get_value_cansleep(unsigned gpio) { return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); } /* A platform's code may want to inline the I/O calls when * the GPIO is constant and refers to some always-present controller, * giving direct access to chip registers and tight bitbanging loops. */ static inline int __gpio_get_value(unsigned gpio) { return gpiod_get_raw_value(gpio_to_desc(gpio)); } static inline void __gpio_set_value(unsigned gpio, int value) { return gpiod_set_raw_value(gpio_to_desc(gpio), value); } static inline int __gpio_cansleep(unsigned gpio) { return gpiod_cansleep(gpio_to_desc(gpio)); } static inline int __gpio_to_irq(unsigned gpio) { return gpiod_to_irq(gpio_to_desc(gpio)); } extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); extern int gpio_request_array(const struct gpio *array, size_t num); extern void gpio_free_array(const struct gpio *array, size_t num); /* * A sysfs interface can be exported by individual drivers if they want, * but more typically is configured entirely from userspace. */ static inline int gpio_export(unsigned gpio, bool direction_may_change) { return gpiod_export(gpio_to_desc(gpio), direction_may_change); } static inline int gpio_export_link(struct device *dev, const char *name, unsigned gpio) { return gpiod_export_link(dev, name, gpio_to_desc(gpio)); } static inline void gpio_unexport(unsigned gpio) { gpiod_unexport(gpio_to_desc(gpio)); } #else /* !CONFIG_GPIOLIB */ static inline bool gpio_is_valid(int number) { /* only non-negative numbers are valid */ return number >= 0; } /* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. */ static inline int gpio_cansleep(unsigned gpio) { return 0; } static inline int gpio_get_value_cansleep(unsigned gpio) { might_sleep(); return __gpio_get_value(gpio); } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { might_sleep(); __gpio_set_value(gpio, value); } #endif /* !CONFIG_GPIOLIB */ #endif /* _ASM_GENERIC_GPIO_H */ oad'/>
authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /include/scsi/scsi_device.h
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'include/scsi/scsi_device.h')