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authorIgor Konopko <igor.j.konopko@intel.com>2019-05-04 20:38:08 +0200
committerJens Axboe <axboe@kernel.dk>2019-05-06 10:19:19 -0600
commite69397ea05ce0263e3ee72fa8f6f70d2d9a561a7 (patch)
tree0e995a61424be0afea2bb593b863343b8883c2a3 /drivers/lightnvm
parenta24eab59887133032831f939ad172233e7acb36e (diff)
downloadlinux-e69397ea05ce0263e3ee72fa8f6f70d2d9a561a7.tar.bz2
lightnvm: track inflight target creations
When creation process is still in progress, target is not yet on targets list. This causes a chance for removing whole lightnvm subsystem by calling nvm_unregister() in the meantime and finally by causing kernel panic inside target init function. This patch changes the behaviour by adding kref variable which tracks all the users of nvm_dev structure. When nvm_dev is allocated, kref value is set to 1. Then before every target creation the value is increased and decreased after target removal. The extra reference is decreased when nvm subsystem is unregistered. Signed-off-by: Igor Konopko <igor.j.konopko@intel.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r--drivers/lightnvm/core.c41
1 files changed, 31 insertions, 10 deletions
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index e2abe88a139c..0e9f7996ff1d 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -45,6 +45,8 @@ struct nvm_dev_map {
int num_ch;
};
+static void nvm_free(struct kref *ref);
+
static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
{
struct nvm_target *tgt;
@@ -501,6 +503,7 @@ static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
}
__nvm_remove_target(t, true);
mutex_unlock(&dev->mlock);
+ kref_put(&dev->ref, nvm_free);
return 0;
}
@@ -1094,15 +1097,16 @@ err_fmtype:
return ret;
}
-static void nvm_free(struct nvm_dev *dev)
+static void nvm_free(struct kref *ref)
{
- if (!dev)
- return;
+ struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);
if (dev->dma_pool)
dev->ops->destroy_dma_pool(dev->dma_pool);
- nvm_unregister_map(dev);
+ if (dev->rmap)
+ nvm_unregister_map(dev);
+
kfree(dev->lun_map);
kfree(dev);
}
@@ -1139,7 +1143,13 @@ err:
struct nvm_dev *nvm_alloc_dev(int node)
{
- return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
+ struct nvm_dev *dev;
+
+ dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
+ if (dev)
+ kref_init(&dev->ref);
+
+ return dev;
}
EXPORT_SYMBOL(nvm_alloc_dev);
@@ -1147,12 +1157,16 @@ int nvm_register(struct nvm_dev *dev)
{
int ret, exp_pool_size;
- if (!dev->q || !dev->ops)
+ if (!dev->q || !dev->ops) {
+ kref_put(&dev->ref, nvm_free);
return -EINVAL;
+ }
ret = nvm_init(dev);
- if (ret)
+ if (ret) {
+ kref_put(&dev->ref, nvm_free);
return ret;
+ }
exp_pool_size = max_t(int, PAGE_SIZE,
(NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
@@ -1162,7 +1176,7 @@ int nvm_register(struct nvm_dev *dev)
exp_pool_size);
if (!dev->dma_pool) {
pr_err("nvm: could not create dma pool\n");
- nvm_free(dev);
+ kref_put(&dev->ref, nvm_free);
return -ENOMEM;
}
@@ -1184,6 +1198,7 @@ void nvm_unregister(struct nvm_dev *dev)
if (t->dev->parent != dev)
continue;
__nvm_remove_target(t, false);
+ kref_put(&dev->ref, nvm_free);
}
mutex_unlock(&dev->mlock);
@@ -1191,13 +1206,14 @@ void nvm_unregister(struct nvm_dev *dev)
list_del(&dev->devices);
up_write(&nvm_lock);
- nvm_free(dev);
+ kref_put(&dev->ref, nvm_free);
}
EXPORT_SYMBOL(nvm_unregister);
static int __nvm_configure_create(struct nvm_ioctl_create *create)
{
struct nvm_dev *dev;
+ int ret;
down_write(&nvm_lock);
dev = nvm_find_nvm_dev(create->dev);
@@ -1208,7 +1224,12 @@ static int __nvm_configure_create(struct nvm_ioctl_create *create)
return -EINVAL;
}
- return nvm_create_tgt(dev, create);
+ kref_get(&dev->ref);
+ ret = nvm_create_tgt(dev, create);
+ if (ret)
+ kref_put(&dev->ref, nvm_free);
+
+ return ret;
}
static long nvm_ioctl_info(struct file *file, void __user *arg)