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Add a mutex to protect the list of interrupt config hooks. We do assume
that the only remove hook operation that can occur while processing the hooks is to remove the currently executing hook. This should be safe as the existing code has assumed this already for a long time now. Reviewed by: scottl MFC after: 1 week
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parent
9c2dc11465
commit
9079458ad2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=160509
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@ -39,6 +39,8 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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/*
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@ -50,26 +52,32 @@ __FBSDID("$FreeBSD$");
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*/
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static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
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TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
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static struct mtx intr_config_hook_lock;
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MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
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/* ARGSUSED */
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static void run_interrupt_driven_config_hooks(void *dummy);
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static void
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run_interrupt_driven_config_hooks(dummy)
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void *dummy;
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{
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struct intr_config_hook *hook_entry, *next_entry;
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for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
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hook_entry != NULL;
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hook_entry = next_entry) {
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mtx_lock(&intr_config_hook_lock);
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TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links,
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next_entry) {
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next_entry = TAILQ_NEXT(hook_entry, ich_links);
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mtx_unlock(&intr_config_hook_lock);
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(*hook_entry->ich_func)(hook_entry->ich_arg);
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mtx_lock(&intr_config_hook_lock);
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}
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while (!TAILQ_EMPTY(&intr_config_hook_list)) {
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tsleep(&intr_config_hook_list, PCONFIG, "conifhk", 0);
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msleep(&intr_config_hook_list, &intr_config_hook_lock, PCONFIG,
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"conifhk", 0);
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}
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mtx_unlock(&intr_config_hook_lock);
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}
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SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
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run_interrupt_driven_config_hooks, NULL)
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@ -85,17 +93,18 @@ config_intrhook_establish(hook)
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{
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struct intr_config_hook *hook_entry;
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for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
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hook_entry != NULL;
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hook_entry = TAILQ_NEXT(hook_entry, ich_links))
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mtx_lock(&intr_config_hook_lock);
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TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
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if (hook_entry == hook)
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break;
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if (hook_entry != NULL) {
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mtx_unlock(&intr_config_hook_lock);
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printf("config_intrhook_establish: establishing an "
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"already established hook.\n");
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return (1);
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}
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TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
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mtx_unlock(&intr_config_hook_lock);
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if (cold == 0)
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/* XXX Sufficient for modules loaded after initial config??? */
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run_interrupt_driven_config_hooks(NULL);
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@ -108,9 +117,8 @@ config_intrhook_disestablish(hook)
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{
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struct intr_config_hook *hook_entry;
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for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
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hook_entry != NULL;
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hook_entry = TAILQ_NEXT(hook_entry, ich_links))
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mtx_lock(&intr_config_hook_lock);
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TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
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if (hook_entry == hook)
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break;
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if (hook_entry == NULL)
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@ -118,6 +126,8 @@ config_intrhook_disestablish(hook)
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"unestablished hook");
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TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
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/* Wakeup anyone watching the list */
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wakeup(&intr_config_hook_list);
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mtx_unlock(&intr_config_hook_lock);
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}
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