/* * Copyright (C) 2015-2016 Mentor Graphics * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include "watchdog_pretimeout.h" /* Default watchdog pretimeout governor */ static struct watchdog_governor *default_gov; /* The spinlock protects default_gov, wdd->gov and pretimeout_list */ static DEFINE_SPINLOCK(pretimeout_lock); /* List of watchdog devices, which can generate a pretimeout event */ static LIST_HEAD(pretimeout_list); struct watchdog_pretimeout { struct watchdog_device *wdd; struct list_head entry; }; /* The mutex protects governor list and serializes external interfaces */ static DEFINE_MUTEX(governor_lock); /* List of the registered watchdog pretimeout governors */ static LIST_HEAD(governor_list); struct governor_priv { struct watchdog_governor *gov; struct list_head entry; }; static struct governor_priv *find_governor_by_name(const char *gov_name) { struct governor_priv *priv; list_for_each_entry(priv, &governor_list, entry) if (sysfs_streq(gov_name, priv->gov->name)) return priv; return NULL; } int watchdog_pretimeout_available_governors_get(char *buf) { struct governor_priv *priv; int count = 0; mutex_lock(&governor_lock); list_for_each_entry(priv, &governor_list, entry) count += sprintf(buf + count, "%s\n", priv->gov->name); mutex_unlock(&governor_lock); return count; } int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf) { int count = 0; spin_lock_irq(&pretimeout_lock); if (wdd->gov) count = sprintf(buf, "%s\n", wdd->gov->name); spin_unlock_irq(&pretimeout_lock); return count; } int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, const char *buf) { struct governor_priv *priv; mutex_lock(&governor_lock); priv = find_governor_by_name(buf); if (!priv) { mutex_unlock(&governor_lock); return -EINVAL; } spin_lock_irq(&pretimeout_lock); wdd->gov = priv->gov; spin_unlock_irq(&pretimeout_lock); mutex_unlock(&governor_lock); return 0; } void watchdog_notify_pretimeout(struct watchdog_device *wdd) { unsigned long flags; spin_lock_irqsave(&pretimeout_lock, flags); if (!wdd->gov) { spin_unlock_irqrestore(&pretimeout_lock, flags); return; } wdd->gov->pretimeout(wdd); spin_unlock_irqrestore(&pretimeout_lock, flags); } EXPORT_SYMBOL_GPL(watchdog_notify_pretimeout); int watchdog_register_governor(struct watchdog_governor *gov) { struct watchdog_pretimeout *p; struct governor_priv *priv; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; mutex_lock(&governor_lock); if (find_governor_by_name(gov->name)) { mutex_unlock(&governor_lock); kfree(priv); return -EBUSY; } priv->gov = gov; list_add(&priv->entry, &governor_list); if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV, WATCHDOG_GOV_NAME_MAXLEN)) { spin_lock_irq(&pretimeout_lock); default_gov = gov; list_for_each_entry(p, &pretimeout_list, entry) if (!p->wdd->gov) p->wdd->gov = default_gov; spin_unlock_irq(&pretimeout_lock); } mutex_unlock(&governor_lock); return 0; } EXPORT_SYMBOL(watchdog_register_governor); void watchdog_unregister_governor(struct watchdog_governor *gov) { struct watchdog_pretimeout *p; struct governor_priv *priv, *t; mutex_lock(&governor_lock); list_for_each_entry_safe(priv, t, &governor_list, entry) { if (priv->gov == gov) { list_del(&priv->entry); kfree(priv); break; } } spin_lock_irq(&pretimeout_lock); list_for_each_entry(p, &pretimeout_list, entry) if (p->wdd->gov == gov) p->wdd->gov = default_gov; spin_unlock_irq(&pretimeout_lock); mutex_unlock(&governor_lock); } EXPORT_SYMBOL(watchdog_unregister_governor); int watchdog_register_pretimeout(struct watchdog_device *wdd) { struct watchdog_pretimeout *p; if (!(wdd->info->options & WDIOF_PRETIMEOUT)) return 0; p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; spin_lock_irq(&pretimeout_lock); list_add(&p->entry, &pretimeout_list); p->wdd = wdd; wdd->gov = default_gov; spin_unlock_irq(&pretimeout_lock); return 0; } void watchdog_unregister_pretimeout(struct watchdog_device *wdd) { struct watchdog_pretimeout *p, *t; if (!(wdd->info->options & WDIOF_PRETIMEOUT)) return; spin_lock_irq(&pretimeout_lock); wdd->gov = NULL; list_for_each_entry_safe(p, t, &pretimeout_list, entry) { if (p->wdd == wdd) { list_del(&p->entry); break; } } spin_unlock_irq(&pretimeout_lock); kfree(p); } am Sang <wsa@the-dreams.de>2017-01-25 22:07:40 +0100 commit0e1929dedea36781e25902118c93edd8d8f09af1 (patch) tree5e353f42c88f892c20528b8a4c28856919594944 /net/can parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
i2c: i2c-cadence: Initialize configuration before probing devices
The cadence I2C driver calls cdns_i2c_writereg(..) to setup a workaround in the controller, but did so after calling i2c_add_adapter() which starts probing devices on the bus. Change the order so that the configuration is completely finished before using the adapter. Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'net/can')