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authorMatias Bjørling <m@bjorling.me>2015-12-06 11:25:50 +0100
committerJens Axboe <axboe@fb.com>2015-12-07 09:14:19 -0700
commit008b74438269b368d57a14452afbc194f7f9ff2f (patch)
tree6abad4f9790c72d6d5b076deff52d992349db629 /drivers/lightnvm
parent762796bc9e5758df6c72253e4ec19657055cea1f (diff)
downloadblackbird-op-linux-008b74438269b368d57a14452afbc194f7f9ff2f.tar.gz
blackbird-op-linux-008b74438269b368d57a14452afbc194f7f9ff2f.zip
lightnvm: prevent gennvm module unload on use
After the gennvm module has been initialized. It might be attached to one or several devices. In that case, the module is in use. Make sure that it can not be unloaded. Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/gennvm.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 52b513a65946..f434e89e1c7a 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -219,6 +219,9 @@ static int gennvm_register(struct nvm_dev *dev)
struct gen_nvm *gn;
int ret;
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL);
if (!gn)
return -ENOMEM;
@@ -242,12 +245,14 @@ static int gennvm_register(struct nvm_dev *dev)
return 1;
err:
gennvm_free(dev);
+ module_put(THIS_MODULE);
return ret;
}
static void gennvm_unregister(struct nvm_dev *dev)
{
gennvm_free(dev);
+ module_put(THIS_MODULE);
}
static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
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