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Subject[PATCH 2/3] blk-mq: pass along blk_mq_alloc_tag_set return values
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Two of the blk-mq based drivers do not pass back the return value
from blk_mq_alloc_tag_set, instead just returning -ENOMEM.

blk_mq_alloc_tag_set returns -EINVAL if the number of queues or
queue depth is bad. -ENOMEM implies that retrying after freeing some
memory might be more successful, but that won't ever change
in the -EINVAL cases.

Change the null_blk and mtip32xx drivers to pass along
the return value.

Signed-off-by: Robert Elliott <elliott@hp.com>
---
drivers/block/mtip32xx/mtip32xx.c | 1 -
drivers/block/null_blk.c | 29 +++++++++++++++++++++--------
2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 295f3af..af72232 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3918,7 +3918,6 @@ skip_create_disk:
if (rv) {
dev_err(&dd->pdev->dev,
"Unable to allocate request queue\n");
- rv = -ENOMEM;
goto block_queue_alloc_init_error;
}

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index a3b042c..00d469c 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -462,17 +462,21 @@ static int null_add_dev(void)
struct gendisk *disk;
struct nullb *nullb;
sector_t size;
+ int rv;

nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node);
- if (!nullb)
+ if (!nullb) {
+ rv = -ENOMEM;
goto out;
+ }

spin_lock_init(&nullb->lock);

if (queue_mode == NULL_Q_MQ && use_per_node_hctx)
submit_queues = nr_online_nodes;

- if (setup_queues(nullb))
+ rv = setup_queues(nullb);
+ if (rv)
goto out_free_nullb;

if (queue_mode == NULL_Q_MQ) {
@@ -484,22 +488,29 @@ static int null_add_dev(void)
nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
nullb->tag_set.driver_data = nullb;

- if (blk_mq_alloc_tag_set(&nullb->tag_set))
+ rv = blk_mq_alloc_tag_set(&nullb->tag_set);
+ if (rv)
goto out_cleanup_queues;

nullb->q = blk_mq_init_queue(&nullb->tag_set);
- if (!nullb->q)
+ if (!nullb->q) {
+ rv = -ENOMEM;
goto out_cleanup_tags;
+ }
} else if (queue_mode == NULL_Q_BIO) {
nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node);
- if (!nullb->q)
+ if (!nullb->q) {
+ rv = -ENOMEM;
goto out_cleanup_queues;
+ }
blk_queue_make_request(nullb->q, null_queue_bio);
init_driver_queues(nullb);
} else {
nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
- if (!nullb->q)
+ if (!nullb->q) {
+ rv = -ENOMEM;
goto out_cleanup_queues;
+ }
blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
init_driver_queues(nullb);
@@ -509,8 +520,10 @@ static int null_add_dev(void)
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q);

disk = nullb->disk = alloc_disk_node(1, home_node);
- if (!disk)
+ if (!disk) {
+ rv = -ENOMEM;
goto out_cleanup_blk_queue;
+ }

mutex_lock(&lock);
list_add_tail(&nullb->list, &nullb_list);
@@ -544,7 +557,7 @@ out_cleanup_queues:
out_free_nullb:
kfree(nullb);
out:
- return -ENOMEM;
+ return rv;
}

static int __init null_init(void)


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