From 008b74438269b368d57a14452afbc194f7f9ff2f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Matias=20Bj=C3=B8rling?= Date: Sun, 6 Dec 2015 11:25:50 +0100 Subject: [PATCH] lightnvm: prevent gennvm module unload on use MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Jens Axboe --- drivers/lightnvm/gennvm.c | 5 +++++ 1 file changed, 5 insertions(+) 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, -- 2.20.1