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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>
This commit is contained in:
Matias Bjørling 2015-12-06 11:25:50 +01:00 committed by Jens Axboe
parent 762796bc9e
commit 008b744382
1 changed files with 5 additions and 0 deletions
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5
drivers/lightnvm/gennvm.c
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@ -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,