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lightnvm: missing nvm_lock acquire 

To avoid race conditions, traverse dev, media manager,
and target lists and also register, unregister entries
to/from them, should be always under the nvm_lock control.

Signed-off-by: Wenwei Tao <ww.tao0320@gmail.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Wenwei Tao 2015-11-28 16:49:28 +01:00 committed by Jens Axboe
parent 08236c6bb2
commit d0a712ceb8
1 changed files with 42 additions and 33 deletions
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75
drivers/lightnvm/core.c
View File

@ -123,6 +123,26 @@ void nvm_unregister_mgr(struct nvmm_type *mt)
}
EXPORT_SYMBOL(nvm_unregister_mgr);
/* register with device with a supported manager */
static int register_mgr(struct nvm_dev *dev)
{
struct nvmm_type *mt;
int ret = 0;
list_for_each_entry(mt, &nvm_mgrs, list) {
ret = mt->register_mgr(dev);
if (ret > 0) {
dev->mt = mt;
break; /* successfully initialized */
}
}
if (!ret)
pr_info("nvm: no compatible nvm manager found.\n");
return ret;
}
static struct nvm_dev *nvm_find_nvm_dev(const char *name)
{
struct nvm_dev *dev;
@ -221,7 +241,6 @@ static void nvm_free(struct nvm_dev *dev)
static int nvm_init(struct nvm_dev *dev)
{
struct nvmm_type *mt;
int ret = -EINVAL;
if (!dev->q || !dev->ops)
@ -252,21 +271,13 @@ static int nvm_init(struct nvm_dev *dev)
goto err;
}
/* register with device with a supported manager */
list_for_each_entry(mt, &nvm_mgrs, list) {
ret = mt->register_mgr(dev);
if (ret < 0)
goto err; /* initialization failed */
if (ret > 0) {
dev->mt = mt;
break; /* successfully initialized */
}
}
if (!ret) {
pr_info("nvm: no compatible manager found.\n");
down_write(&nvm_lock);
ret = register_mgr(dev);
up_write(&nvm_lock);
if (ret < 0)
goto err;
if (!ret)
return 0;
}
pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
dev->name, dev->sec_per_pg, dev->nr_planes,
@ -337,15 +348,17 @@ EXPORT_SYMBOL(nvm_register);
void nvm_unregister(char *disk_name)
{
struct nvm_dev *dev = nvm_find_nvm_dev(disk_name);
struct nvm_dev *dev;
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(disk_name);
if (!dev) {
pr_err("nvm: could not find device %s to unregister\n",
disk_name);
up_write(&nvm_lock);
return;
}
down_write(&nvm_lock);
list_del(&dev->devices);
up_write(&nvm_lock);
@ -363,38 +376,30 @@ static int nvm_create_target(struct nvm_dev *dev,
{
struct nvm_ioctl_create_simple *s = &create->conf.s;
struct request_queue *tqueue;
struct nvmm_type *mt;
struct gendisk *tdisk;
struct nvm_tgt_type *tt;
struct nvm_target *t;
void *targetdata;
int ret = 0;
down_write(&nvm_lock);
if (!dev->mt) {
/* register with device with a supported NVM manager */
list_for_each_entry(mt, &nvm_mgrs, list) {
ret = mt->register_mgr(dev);
if (ret < 0)
return ret; /* initialization failed */
if (ret > 0) {
dev->mt = mt;
break; /* successfully initialized */
}
}
if (!ret) {
pr_info("nvm: no compatible nvm manager found.\n");
return -ENODEV;
ret = register_mgr(dev);
if (!ret)
ret = -ENODEV;
if (ret < 0) {
up_write(&nvm_lock);
return ret;
}
}
tt = nvm_find_target_type(create->tgttype);
if (!tt) {
pr_err("nvm: target type %s not found\n", create->tgttype);
up_write(&nvm_lock);
return -EINVAL;
}
down_write(&nvm_lock);
list_for_each_entry(t, &dev->online_targets, list) {
if (!strcmp(create->tgtname, t->disk->disk_name)) {
pr_err("nvm: target name already exists.\n");
@ -478,7 +483,9 @@ static int __nvm_configure_create(struct nvm_ioctl_create *create)
struct nvm_dev *dev;
struct nvm_ioctl_create_simple *s;
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(create->dev);
up_write(&nvm_lock);
if (!dev) {
pr_err("nvm: device not found\n");
return -EINVAL;
@ -537,7 +544,9 @@ static int nvm_configure_show(const char *val)
return -EINVAL;
}
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(devname);
up_write(&nvm_lock);
if (!dev) {
pr_err("nvm: device not found\n");
return -EINVAL;