/* * Copyright 2014 Google, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include "internal.h" static DEFINE_MUTEX(pmsg_lock); static ssize_t write_pmsg(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { u64 id; int ret; if (!count) return 0; /* check outside lock, page in any data. write_buf_user also checks */ if (!access_ok(VERIFY_READ, buf, count)) return -EFAULT; mutex_lock(&pmsg_lock); ret = psinfo->write_buf_user(PSTORE_TYPE_PMSG, 0, &id, 0, buf, 0, count, psinfo); mutex_unlock(&pmsg_lock); return ret ? ret : count; } static const struct file_operations pmsg_fops = { .owner = THIS_MODULE, .llseek = noop_llseek, .write = write_pmsg, }; static struct class *pmsg_class; static int pmsg_major; #define PMSG_NAME "pmsg" #undef pr_fmt #define pr_fmt(fmt) PMSG_NAME ": " fmt static char *pmsg_devnode(struct device *dev, umode_t *mode) { if (mode) *mode = 0220; return NULL; } void pstore_register_pmsg(void) { struct device *pmsg_device; pmsg_major = register_chrdev(0, PMSG_NAME, &pmsg_fops); if (pmsg_major < 0) { pr_err("register_chrdev failed\n"); goto err; } pmsg_class = class_create(THIS_MODULE, PMSG_NAME); if (IS_ERR(pmsg_class)) { pr_err("device class file already in use\n"); goto err_class; } pmsg_class->devnode = pmsg_devnode; pmsg_device = device_create(pmsg_class, NULL, MKDEV(pmsg_major, 0), NULL, "%s%d", PMSG_NAME, 0); if (IS_ERR(pmsg_device)) { pr_err("failed to create device\n"); goto err_device; } return; err_device: class_destroy(pmsg_class); err_class: unregister_chrdev(pmsg_major, PMSG_NAME); err: return; } void pstore_unregister_pmsg(void) { device_destroy(pmsg_class, MKDEV(pmsg_major, 0)); class_destroy(pmsg_class); unregister_chrdev(pmsg_major, PMSG_NAME); }
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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2017-01-13 11:46:39 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2017-01-13 17:02:38 +0000
commited79c9d34f4f4c5842b66cab840315e7ac29f666 (patch)
treed073a53ff78844c9a763c076b21c5348eb4cffec
parentddc37832a1349f474c4532de381498020ed71d31 (diff)
ARM: put types.h in uapi
Due to the way kbuild works, this header was unintentionally exported back in 2013 when it was created, despite it not being in a uapi/ directory. This is very non-intuitive behaviour by Kbuild. However, we've had this include exported to userland for almost four years, and searching google for "ARM types.h __UINTPTR_TYPE__" gives no hint that anyone has complained about it. So, let's make it officially exported in this state. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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