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https://github.com/adulau/aha.git
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[PATCH] kobj_map semaphore to mutex conversion
Convert the kobj_map code to use a mutex instead of a semaphore. It converts the single two users as well, genhd.c and char_dev.c. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jes Sorensen
Greg Kroah-Hartman
parent
8b5536bbee
commit
58383af629
4 changed files with 38 additions and 35 deletions
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@ -15,12 +15,13 @@
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#include <linux/kmod.h>
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#include <linux/kobj_map.h>
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#include <linux/buffer_head.h>
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#include <linux/mutex.h>
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#define MAX_PROBE_HASH 255 /* random */
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static struct subsystem block_subsys;
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static DECLARE_MUTEX(block_subsys_sem);
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static DEFINE_MUTEX(block_subsys_lock);
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/*
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* Can be deleted altogether. Later.
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@ -46,7 +47,7 @@ struct blkdev_info {
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/*
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* iterate over a list of blkdev_info structures. allows
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* the major_names array to be iterated over from outside this file
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* must be called with the block_subsys_sem held
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* must be called with the block_subsys_lock held
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*/
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void *get_next_blkdev(void *dev)
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{
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@ -85,20 +86,20 @@ out:
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void *acquire_blkdev_list(void)
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{
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down(&block_subsys_sem);
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mutex_lock(&block_subsys_lock);
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return get_next_blkdev(NULL);
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}
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void release_blkdev_list(void *dev)
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{
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up(&block_subsys_sem);
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mutex_unlock(&block_subsys_lock);
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kfree(dev);
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}
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/*
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* Count the number of records in the blkdev_list.
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* must be called with the block_subsys_sem held
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* must be called with the block_subsys_lock held
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*/
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int count_blkdev_list(void)
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{
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@ -118,7 +119,7 @@ int count_blkdev_list(void)
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/*
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* extract the major and name values from a blkdev_info struct
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* passed in as a void to *dev. Must be called with
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* block_subsys_sem held
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* block_subsys_lock held
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*/
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int get_blkdev_info(void *dev, int *major, char **name)
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{
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@ -138,7 +139,7 @@ int register_blkdev(unsigned int major, const char *name)
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struct blk_major_name **n, *p;
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int index, ret = 0;
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down(&block_subsys_sem);
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mutex_lock(&block_subsys_lock);
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/* temporary */
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if (major == 0) {
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@ -183,7 +184,7 @@ int register_blkdev(unsigned int major, const char *name)
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kfree(p);
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}
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out:
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up(&block_subsys_sem);
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mutex_unlock(&block_subsys_lock);
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return ret;
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}
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@ -197,7 +198,7 @@ int unregister_blkdev(unsigned int major, const char *name)
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int index = major_to_index(major);
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int ret = 0;
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down(&block_subsys_sem);
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mutex_lock(&block_subsys_lock);
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for (n = &major_names[index]; *n; n = &(*n)->next)
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if ((*n)->major == major)
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break;
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@ -207,7 +208,7 @@ int unregister_blkdev(unsigned int major, const char *name)
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p = *n;
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*n = p->next;
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}
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up(&block_subsys_sem);
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mutex_unlock(&block_subsys_lock);
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kfree(p);
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return ret;
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@ -301,7 +302,7 @@ static void *part_start(struct seq_file *part, loff_t *pos)
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struct list_head *p;
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loff_t l = *pos;
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down(&block_subsys_sem);
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mutex_lock(&block_subsys_lock);
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list_for_each(p, &block_subsys.kset.list)
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if (!l--)
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return list_entry(p, struct gendisk, kobj.entry);
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@ -318,7 +319,7 @@ static void *part_next(struct seq_file *part, void *v, loff_t *pos)
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static void part_stop(struct seq_file *part, void *v)
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{
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up(&block_subsys_sem);
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mutex_unlock(&block_subsys_lock);
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}
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static int show_partition(struct seq_file *part, void *v)
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@ -377,7 +378,7 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data)
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static int __init genhd_device_init(void)
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{
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bdev_map = kobj_map_init(base_probe, &block_subsys_sem);
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bdev_map = kobj_map_init(base_probe, &block_subsys_lock);
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blk_dev_init();
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subsystem_register(&block_subsys);
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return 0;
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@ -611,7 +612,7 @@ static void *diskstats_start(struct seq_file *part, loff_t *pos)
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loff_t k = *pos;
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struct list_head *p;
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down(&block_subsys_sem);
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mutex_lock(&block_subsys_lock);
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list_for_each(p, &block_subsys.kset.list)
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if (!k--)
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return list_entry(p, struct gendisk, kobj.entry);
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@ -628,7 +629,7 @@ static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
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static void diskstats_stop(struct seq_file *part, void *v)
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{
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up(&block_subsys_sem);
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mutex_unlock(&block_subsys_lock);
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}
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static int diskstats_show(struct seq_file *s, void *v)
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@ -11,6 +11,7 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/kdev_t.h>
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#include <linux/kobject.h>
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#include <linux/kobj_map.h>
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@ -25,7 +26,7 @@ struct kobj_map {
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int (*lock)(dev_t, void *);
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void *data;
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} *probes[255];
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struct semaphore *sem;
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struct mutex *lock;
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};
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int kobj_map(struct kobj_map *domain, dev_t dev, unsigned long range,
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@ -53,7 +54,7 @@ int kobj_map(struct kobj_map *domain, dev_t dev, unsigned long range,
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p->range = range;
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p->data = data;
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}
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down(domain->sem);
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mutex_lock(domain->lock);
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for (i = 0, p -= n; i < n; i++, p++, index++) {
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struct probe **s = &domain->probes[index % 255];
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while (*s && (*s)->range < range)
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@ -61,7 +62,7 @@ int kobj_map(struct kobj_map *domain, dev_t dev, unsigned long range,
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p->next = *s;
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*s = p;
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}
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up(domain->sem);
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mutex_unlock(domain->lock);
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return 0;
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}
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@ -75,7 +76,7 @@ void kobj_unmap(struct kobj_map *domain, dev_t dev, unsigned long range)
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if (n > 255)
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n = 255;
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down(domain->sem);
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mutex_lock(domain->lock);
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for (i = 0; i < n; i++, index++) {
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struct probe **s;
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for (s = &domain->probes[index % 255]; *s; s = &(*s)->next) {
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@ -88,7 +89,7 @@ void kobj_unmap(struct kobj_map *domain, dev_t dev, unsigned long range)
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}
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}
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}
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up(domain->sem);
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mutex_unlock(domain->lock);
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kfree(found);
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}
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@ -99,7 +100,7 @@ struct kobject *kobj_lookup(struct kobj_map *domain, dev_t dev, int *index)
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unsigned long best = ~0UL;
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retry:
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down(domain->sem);
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mutex_lock(domain->lock);
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for (p = domain->probes[MAJOR(dev) % 255]; p; p = p->next) {
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struct kobject *(*probe)(dev_t, int *, void *);
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struct module *owner;
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@ -120,7 +121,7 @@ retry:
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module_put(owner);
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continue;
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}
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up(domain->sem);
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mutex_unlock(domain->lock);
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kobj = probe(dev, index, data);
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/* Currently ->owner protects _only_ ->probe() itself. */
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module_put(owner);
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@ -128,11 +129,11 @@ retry:
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return kobj;
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goto retry;
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}
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up(domain->sem);
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mutex_unlock(domain->lock);
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return NULL;
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}
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struct kobj_map *kobj_map_init(kobj_probe_t *base_probe, struct semaphore *sem)
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struct kobj_map *kobj_map_init(kobj_probe_t *base_probe, struct mutex *lock)
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{
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struct kobj_map *p = kmalloc(sizeof(struct kobj_map), GFP_KERNEL);
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struct probe *base = kzalloc(sizeof(*base), GFP_KERNEL);
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@ -149,6 +150,6 @@ struct kobj_map *kobj_map_init(kobj_probe_t *base_probe, struct semaphore *sem)
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base->get = base_probe;
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for (i = 0; i < 255; i++)
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p->probes[i] = base;
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p->sem = sem;
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p->lock = lock;
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return p;
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}
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@ -19,6 +19,7 @@
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#include <linux/kobject.h>
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#include <linux/kobj_map.h>
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#include <linux/cdev.h>
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#include <linux/mutex.h>
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#ifdef CONFIG_KMOD
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#include <linux/kmod.h>
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@ -28,7 +29,7 @@ static struct kobj_map *cdev_map;
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#define MAX_PROBE_HASH 255 /* random */
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static DECLARE_MUTEX(chrdevs_lock);
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static DEFINE_MUTEX(chrdevs_lock);
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static struct char_device_struct {
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struct char_device_struct *next;
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@ -88,13 +89,13 @@ out:
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void *acquire_chrdev_list(void)
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{
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down(&chrdevs_lock);
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mutex_lock(&chrdevs_lock);
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return get_next_chrdev(NULL);
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}
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void release_chrdev_list(void *dev)
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{
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up(&chrdevs_lock);
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mutex_unlock(&chrdevs_lock);
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kfree(dev);
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}
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@ -151,7 +152,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
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memset(cd, 0, sizeof(struct char_device_struct));
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down(&chrdevs_lock);
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mutex_lock(&chrdevs_lock);
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/* temporary */
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if (major == 0) {
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@ -186,10 +187,10 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
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}
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cd->next = *cp;
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*cp = cd;
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up(&chrdevs_lock);
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mutex_unlock(&chrdevs_lock);
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return cd;
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out:
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up(&chrdevs_lock);
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mutex_unlock(&chrdevs_lock);
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kfree(cd);
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return ERR_PTR(ret);
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}
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@ -200,7 +201,7 @@ __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct)
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struct char_device_struct *cd = NULL, **cp;
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int i = major_to_index(major);
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down(&chrdevs_lock);
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mutex_lock(&chrdevs_lock);
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for (cp = &chrdevs[i]; *cp; cp = &(*cp)->next)
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if ((*cp)->major == major &&
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(*cp)->baseminor == baseminor &&
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@ -210,7 +211,7 @@ __unregister_chrdev_region(unsigned major, unsigned baseminor, int minorct)
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cd = *cp;
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*cp = cd->next;
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}
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up(&chrdevs_lock);
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mutex_unlock(&chrdevs_lock);
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return cd;
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}
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@ -1,6 +1,6 @@
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#ifdef __KERNEL__
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#include <asm/semaphore.h>
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#include <linux/mutex.h>
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typedef struct kobject *kobj_probe_t(dev_t, int *, void *);
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struct kobj_map;
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@ -9,6 +9,6 @@ int kobj_map(struct kobj_map *, dev_t, unsigned long, struct module *,
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kobj_probe_t *, int (*)(dev_t, void *), void *);
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void kobj_unmap(struct kobj_map *, dev_t, unsigned long);
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struct kobject *kobj_lookup(struct kobj_map *, dev_t, int *);
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struct kobj_map *kobj_map_init(kobj_probe_t *, struct semaphore *);
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struct kobj_map *kobj_map_init(kobj_probe_t *, struct mutex *);
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#endif
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