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Subject[PATCH] libnvdimm: use devm_add_action_or_reset()
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Date
Clean up needless calls to the action routine by letting
devm_add_action_or_reset() call it automatically. This does cause the
disk to registered and immediately unregistered when a memory allocation
fails, but the block layer should be prepared for such an event.

Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/blk.c | 11 ++++-------
drivers/nvdimm/pmem.c | 12 +++++-------
2 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 495e06d9f7e7..dfe691cf4d74 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -267,10 +267,8 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
q = blk_alloc_queue(GFP_KERNEL);
if (!q)
return -ENOMEM;
- if (devm_add_action(dev, nd_blk_release_queue, q)) {
- blk_cleanup_queue(q);
+ if (devm_add_action_or_reset(dev, nd_blk_release_queue, q))
return -ENOMEM;
- }

blk_queue_make_request(q, nd_blk_make_request);
blk_queue_max_hw_sectors(q, UINT_MAX);
@@ -282,10 +280,6 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
disk = alloc_disk(0);
if (!disk)
return -ENOMEM;
- if (devm_add_action(dev, nd_blk_release_disk, disk)) {
- put_disk(disk);
- return -ENOMEM;
- }

disk->driverfs_dev = dev;
disk->first_minor = 0;
@@ -296,6 +290,9 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
set_capacity(disk, 0);
add_disk(disk);

+ if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk))
+ return -ENOMEM;
+
if (nsblk_meta_size(nsblk)) {
int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk));

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 608fc4464574..2ef1229e8ded 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -269,10 +269,8 @@ static int pmem_attach_disk(struct device *dev,
* At release time the queue must be dead before
* devm_memremap_pages is unwound
*/
- if (devm_add_action(dev, pmem_release_queue, q)) {
- blk_cleanup_queue(q);
+ if (devm_add_action_or_reset(dev, pmem_release_queue, q))
return -ENOMEM;
- }

if (IS_ERR(addr))
return PTR_ERR(addr);
@@ -288,10 +286,6 @@ static int pmem_attach_disk(struct device *dev,
disk = alloc_disk_node(0, nid);
if (!disk)
return -ENOMEM;
- if (devm_add_action(dev, pmem_release_disk, disk)) {
- put_disk(disk);
- return -ENOMEM;
- }

disk->fops = &pmem_fops;
disk->queue = q;
@@ -305,6 +299,10 @@ static int pmem_attach_disk(struct device *dev,
nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb, res);
disk->bb = &pmem->bb;
add_disk(disk);
+
+ if (devm_add_action_or_reset(dev, pmem_release_disk, disk))
+ return -ENOMEM;
+
revalidate_disk(disk);

return 0;
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