On 11/24/2015 04:24 PM, Wenwei Tao wrote:
To avoid race conditions, traverse dev, media manager,
and targeet lists and also register, unregister entries
to/from them, should be always under the nvm_lock control.
Signed-off-by: Wenwei Tao <ww.tao0320@xxxxxxxxx>
---
drivers/lightnvm/core.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index f659e60..39aec3a 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -333,19 +333,19 @@ EXPORT_SYMBOL(nvm_register);
void nvm_unregister(char *disk_name)
{
+ down_write(&nvm_lock);
struct nvm_dev *dev = nvm_find_nvm_dev(disk_name);
In nvm_find_nvm_dev, can we instead replace it with
list_for_each_entry_safe. Then we are sure that we won't hit a missing
element, and will make the other cases significantly cleaner.
if (!dev) {
pr_err("nvm: could not find device %s to unregister\n",
disk_name);
+ up_write(&nvm_lock);
return;
}
- nvm_exit(dev);
-
- down_write(&nvm_lock);
list_del(&dev->devices);
up_write(&nvm_lock);
+ nvm_exit(dev);
}
EXPORT_SYMBOL(nvm_unregister);
@@ -365,12 +365,15 @@ static int nvm_create_target(struct nvm_dev *dev,
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) {
Same with this one?
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