libnvdimm, blk: use devm_add_action to release bdev resources

Register a callback to clean up the request_queue and put the gendisk at
driver disable time.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index c8215dc..27ff32a 100644 (file)
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -22,8 +22,6 @@
 #include "nd.h"
 
 struct nd_blk_device {
-       struct request_queue *queue;
-       struct gendisk *disk;
        struct nd_namespace_blk *nsblk;
        struct nd_blk_region *ndbr;
        size_t disk_size;
@@ -235,29 +233,47 @@ static const struct block_device_operations nd_blk_fops = {
        .revalidate_disk = nvdimm_revalidate_disk,
 };
 
-static int nd_blk_attach_disk(struct nd_namespace_common *ndns,
-               struct nd_blk_device *blk_dev)
+static void nd_blk_release_queue(void *q)
+{
+       blk_cleanup_queue(q);
+}
+
+static void nd_blk_release_disk(void *disk)
+{
+       del_gendisk(disk);
+       put_disk(disk);
+}
+
+static int nd_blk_attach_disk(struct device *dev,
+               struct nd_namespace_common *ndns, struct nd_blk_device *blk_dev)
 {
        resource_size_t available_disk_size;
+       struct request_queue *q;
        struct gendisk *disk;
        u64 internal_nlba;
 
        internal_nlba = div_u64(blk_dev->disk_size, blk_dev->internal_lbasize);
        available_disk_size = internal_nlba * blk_dev->sector_size;
 
-       blk_dev->queue = blk_alloc_queue(GFP_KERNEL);
-       if (!blk_dev->queue)
+       q = blk_alloc_queue(GFP_KERNEL);
+       if (!q)
+               return -ENOMEM;
+       if (devm_add_action(dev, nd_blk_release_queue, q)) {
+               blk_cleanup_queue(q);
                return -ENOMEM;
+       }
 
-       blk_queue_make_request(blk_dev->queue, nd_blk_make_request);
-       blk_queue_max_hw_sectors(blk_dev->queue, UINT_MAX);
-       blk_queue_bounce_limit(blk_dev->queue, BLK_BOUNCE_ANY);
-       blk_queue_logical_block_size(blk_dev->queue, blk_dev->sector_size);
-       queue_flag_set_unlocked(QUEUE_FLAG_NONROT, blk_dev->queue);
+       blk_queue_make_request(q, nd_blk_make_request);
+       blk_queue_max_hw_sectors(q, UINT_MAX);
+       blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
+       blk_queue_logical_block_size(q, blk_dev->sector_size);
+       queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
 
-       disk = blk_dev->disk = alloc_disk(0);
-       if (!disk) {
-               blk_cleanup_queue(blk_dev->queue);
+       disk = alloc_disk(0);
+       if (!disk)
+               return -ENOMEM;
+       if (devm_add_action(dev, nd_blk_release_disk, disk)) {
+               put_disk(disk);
                return -ENOMEM;
        }
 
@@ -265,7 +281,7 @@ static int nd_blk_attach_disk(struct nd_namespace_common *ndns,
        disk->first_minor       = 0;
        disk->fops              = &nd_blk_fops;
        disk->private_data      = blk_dev;
-       disk->queue             = blk_dev->queue;
+       disk->queue             = q;
        disk->flags             = GENHD_FL_EXT_DEVT;
        nvdimm_namespace_disk_name(ndns, disk->disk_name);
        set_capacity(disk, 0);
@@ -274,12 +290,8 @@ static int nd_blk_attach_disk(struct nd_namespace_common *ndns,
        if (nd_blk_meta_size(blk_dev)) {
                int rc = nd_integrity_init(disk, nd_blk_meta_size(blk_dev));
 
-               if (rc) {
-                       del_gendisk(disk);
-                       put_disk(disk);
-                       blk_cleanup_queue(blk_dev->queue);
+               if (rc)
                        return rc;
-               }
        }
 
        set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
@@ -292,13 +304,12 @@ static int nd_blk_probe(struct device *dev)
        struct nd_namespace_common *ndns;
        struct nd_namespace_blk *nsblk;
        struct nd_blk_device *blk_dev;
-       int rc;
 
        ndns = nvdimm_namespace_common_probe(dev);
        if (IS_ERR(ndns))
                return PTR_ERR(ndns);
 
-       blk_dev = kzalloc(sizeof(*blk_dev), GFP_KERNEL);
+       blk_dev = devm_kzalloc(dev, sizeof(*blk_dev), GFP_KERNEL);
        if (!blk_dev)
                return -ENOMEM;
 
@@ -313,34 +324,18 @@ static int nd_blk_probe(struct device *dev)
 
        ndns->rw_bytes = nd_blk_rw_bytes;
        if (is_nd_btt(dev))
-               rc = nvdimm_namespace_attach_btt(ndns);
+               return nvdimm_namespace_attach_btt(ndns);
        else if (nd_btt_probe(dev, ndns, blk_dev) == 0) {
                /* we'll come back as btt-blk */
-               rc = -ENXIO;
+               return -ENXIO;
        } else
-               rc = nd_blk_attach_disk(ndns, blk_dev);
-       if (rc)
-               kfree(blk_dev);
-       return rc;
-}
-
-static void nd_blk_detach_disk(struct nd_blk_device *blk_dev)
-{
-       del_gendisk(blk_dev->disk);
-       put_disk(blk_dev->disk);
-       blk_cleanup_queue(blk_dev->queue);
+               return nd_blk_attach_disk(dev, ndns, blk_dev);
 }
 
 static int nd_blk_remove(struct device *dev)
 {
-       struct nd_blk_device *blk_dev = dev_get_drvdata(dev);
-
        if (is_nd_btt(dev))
                nvdimm_namespace_detach_btt(to_nd_btt(dev));
-       else
-               nd_blk_detach_disk(blk_dev);
-       kfree(blk_dev);
-
        return 0;
 }