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lightnvm: refactor target type lookup

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Refactor target type lookup to use/not use locks explicitly instead of
using a hidden parameter to make the function locking.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González 2018-01-05 14:16:04 +01:00 committed by Jens Axboe
parent fae7fae407
commit e29c80e6dd
1 changed files with 17 additions and 13 deletions
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26
drivers/lightnvm/core.c
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@ -220,21 +220,25 @@ static const struct block_device_operations nvm_fops = {
.owner = THIS_MODULE,
};
static struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
{
struct nvm_tgt_type *tmp, *tt = NULL;
struct nvm_tgt_type *tt;
if (lock)
down_write(&nvm_tgtt_lock);
list_for_each_entry(tt, &nvm_tgt_types, list)
if (!strcmp(name, tt->name))
return tt;
list_for_each_entry(tmp, &nvm_tgt_types, list)
if (!strcmp(name, tmp->name)) {
tt = tmp;
break;
return NULL;
}
if (lock)
static struct nvm_tgt_type *nvm_find_target_type(const char *name)
{
struct nvm_tgt_type *tt;
down_write(&nvm_tgtt_lock);
tt = __nvm_find_target_type(name);
up_write(&nvm_tgtt_lock);
return tt;
}
@ -249,7 +253,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
void *targetdata;
int ret;
tt = nvm_find_target_type(create->tgttype, 1);
tt = nvm_find_target_type(create->tgttype);
if (!tt) {
pr_err("nvm: target type %s not found\n", create->tgttype);
return -EINVAL;
@ -523,7 +527,7 @@ int nvm_register_tgt_type(struct nvm_tgt_type *tt)
int ret = 0;
down_write(&nvm_tgtt_lock);
if (nvm_find_target_type(tt->name, 0))
if (__nvm_find_target_type(tt->name))
ret = -EEXIST;
else
list_add(&tt->list, &nvm_tgt_types);