From 52409fae3e4b8d16b68b61902fc09075cd97b75d Mon Sep 17 00:00:00 2001 From: Dominik Sliwa Date: Sun, 2 Jul 2017 16:41:37 +0200 Subject: Backports generated from 4.11 kernel Initial commit. Signed-off-by: Dominik Sliwa --- compat/backport-4.5.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 compat/backport-4.5.c (limited to 'compat/backport-4.5.c') diff --git a/compat/backport-4.5.c b/compat/backport-4.5.c new file mode 100644 index 0000000..69751d5 --- /dev/null +++ b/compat/backport-4.5.c @@ -0,0 +1,153 @@ +/* + * Copyright(c) 2015 Hauke Mehrtens + * + * Backport functionality introduced in Linux 4.5. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if LINUX_VERSION_IS_GEQ(3,19,0) +int led_set_brightness_sync(struct led_classdev *led_cdev, + enum led_brightness value) +{ + if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) + return -EBUSY; + + led_cdev->brightness = min(value, led_cdev->max_brightness); + + if (led_cdev->flags & LED_SUSPENDED) + return 0; + + if (led_cdev->brightness_set_sync) + return led_cdev->brightness_set_sync(led_cdev, + led_cdev->brightness); + return -ENOTSUPP; +} +EXPORT_SYMBOL_GPL(led_set_brightness_sync); +#endif /* >= 3.19 */ + +#if LINUX_VERSION_IS_GEQ(3,2,0) +/** + * no_seek_end_llseek - llseek implementation for fixed-sized devices + * @file: file structure to seek on + * @offset: file offset to seek to + * @whence: type of seek + * + */ +loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence) +{ + switch (whence) { + case SEEK_SET: case SEEK_CUR: +#if LINUX_VERSION_IS_GEQ(3,6,0) + return generic_file_llseek_size(file, offset, whence, + ~0ULL, 0); +#else + return generic_file_llseek_size(file, offset, whence, + ~0ULL); +#endif + default: + return -EINVAL; + } +} +EXPORT_SYMBOL_GPL(no_seek_end_llseek); +#endif /* >= 3.2 */ + +/** + * memdup_user_nul - duplicate memory region from user space and NUL-terminate + * + * @src: source address in user space + * @len: number of bytes to copy + * + * Returns an ERR_PTR() on failure. + */ +void *memdup_user_nul(const void __user *src, size_t len) +{ + char *p; + + /* + * Always use GFP_KERNEL, since copy_from_user() can sleep and + * cause pagefault, which makes it pointless to use GFP_NOFS + * or GFP_ATOMIC. + */ + p = kmalloc(len + 1, GFP_KERNEL); + if (!p) + return ERR_PTR(-ENOMEM); + + if (copy_from_user(p, src, len)) { + kfree(p); + return ERR_PTR(-EFAULT); + } + p[len] = '\0'; + + return p; +} +EXPORT_SYMBOL_GPL(memdup_user_nul); + +void phy_attached_info(struct phy_device *phydev) +{ + phy_attached_print(phydev, NULL); +} +EXPORT_SYMBOL_GPL(phy_attached_info); + +#define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)" +void phy_attached_print(struct phy_device *phydev, const char *fmt, ...) +{ + if (!fmt) { + dev_info(&phydev->dev, ATTACHED_FMT "\n", + phydev->drv->name, phydev_name(phydev), + phydev->irq); + } else { + va_list ap; + + dev_info(&phydev->dev, ATTACHED_FMT, + phydev->drv->name, phydev_name(phydev), + phydev->irq); + + va_start(ap, fmt); + vprintk(fmt, ap); + va_end(ap); + } +} +EXPORT_SYMBOL_GPL(phy_attached_print); + +static void devm_led_trigger_release(struct device *dev, void *res) +{ + led_trigger_unregister(*(struct led_trigger **)res); +} + +int devm_led_trigger_register(struct device *dev, + struct led_trigger *trig) +{ + struct led_trigger **dr; + int rc; + + dr = devres_alloc(devm_led_trigger_release, sizeof(*dr), + GFP_KERNEL); + if (!dr) + return -ENOMEM; + + *dr = trig; + + rc = led_trigger_register(trig); + if (rc) + devres_free(dr); + else + devres_add(dev, dr); + + return rc; +} +EXPORT_SYMBOL_GPL(devm_led_trigger_register); -- cgit v1.2.3