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Subject[PATCH] lightnvm: propagate pblk_init return to userspace
From userspace calling ioctl(NVM_DEV_CREATE) was returning ENOMEM for
invalid arguments even though pblk (pblk_init) was returning correctly
-EINVAL to nvm_create_tgt inside core. This patch propagates the
correct return value to userspace.

Because pblk was introduced recently this only needs to go in 4.12.

Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target")
Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
---
drivers/lightnvm/core.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 5d7aa45..54a06c3 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -235,6 +235,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
struct nvm_target *t;
struct nvm_tgt_dev *tgt_dev;
void *targetdata;
+ int ret;

tt = nvm_find_target_type(create->tgttype, 1);
if (!tt) {
@@ -255,22 +256,29 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
return -ENOMEM;

t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
- if (!t)
+ if (!t) {
+ ret = -ENOMEM;
goto err_reserve;
+ }

tgt_dev = nvm_create_tgt_dev(dev, s->lun_begin, s->lun_end);
if (!tgt_dev) {
pr_err("nvm: could not create target device\n");
+ ret = -ENOMEM;
goto err_t;
}

tdisk = alloc_disk(0);
- if (!tdisk)
+ if (!tdisk) {
+ ret = -ENOMEM;
goto err_dev;
+ }

tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
- if (!tqueue)
+ if (!tqueue) {
+ ret = -ENOMEM;
goto err_disk;
+ }
blk_queue_make_request(tqueue, tt->make_rq);

strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
@@ -281,8 +289,10 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
tdisk->queue = tqueue;

targetdata = tt->init(tgt_dev, tdisk, create->flags);
- if (IS_ERR(targetdata))
+ if (IS_ERR(targetdata)) {
+ ret = PTR_ERR(targetdata);
goto err_init;
+ }

tdisk->private_data = targetdata;
tqueue->queuedata = targetdata;
@@ -292,8 +302,10 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
set_capacity(tdisk, tt->capacity(targetdata));
add_disk(tdisk);

- if (tt->sysfs_init && tt->sysfs_init(tdisk))
+ if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
+ ret = -ENOMEM;
goto err_sysfs;
+ }

t->type = tt;
t->disk = tdisk;
@@ -318,7 +330,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
kfree(t);
err_reserve:
nvm_release_luns_err(dev, s->lun_begin, s->lun_end);
- return -ENOMEM;
+ return ret;
}

static void __nvm_remove_target(struct nvm_target *t)
--
2.9.3
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