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n64: cleanup n64cart_probe()

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The goto label fail_queue is needed to cleanup the queue allocation
when devm_platform_ioremap_resource() or alloc_disk() fails, either of
these two functions are not dependent on the queue variable which is
allocated prior to these calls.

Allocate the queue variable after successful alloc_disk(). Return
error directly when devm_platform_ioremap_resource() or alloc_disk()
fail. Remove fail_queue label and a call to the blk_cleanup_queue().

Direct return from these two functions allows us to remove the local
variable err and allocating queue after alloc_disk() allows us to
remove the local variable queue so we use disk->queue directly.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Chaitanya Kulkarni 2021-01-25 15:32:42 -08:00 committed by Thomas Bogendoerfer
parent 37772f9136
commit 0d42478085
1 changed files with 11 additions and 22 deletions
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33
drivers/block/n64cart.c
View file

@ -116,9 +116,7 @@ static const struct block_device_operations n64cart_fops = {
*/
static int __init n64cart_probe(struct platform_device *pdev)
{
int err;
struct gendisk *disk;
struct request_queue *queue;
if (!start || !size) {
pr_err("start or size not specified\n");
@ -130,26 +128,21 @@ static int __init n64cart_probe(struct platform_device *pdev)
return -ENODEV;
}
queue = blk_alloc_queue(NUMA_NO_NODE);
if (!queue)
return -ENOMEM;
reg_base = devm_platform_ioremap_resource(pdev, 0);
if (!reg_base) {
err = -EINVAL;
goto fail_queue;
}
if (!reg_base)
return -EINVAL;
disk = alloc_disk(0);
if (!disk) {
err = -ENOMEM;
goto fail_queue;
}
if (!disk)
return -ENOMEM;
disk->queue = blk_alloc_queue(NUMA_NO_NODE);
if (!disk->queue)
return -ENOMEM;
dev = &pdev->dev;
disk->first_minor = 0;
disk->queue = queue;
disk->flags = GENHD_FL_NO_PART_SCAN | GENHD_FL_EXT_DEVT;
disk->fops = &n64cart_fops;
strcpy(disk->disk_name, "n64cart");
@ -157,19 +150,15 @@ static int __init n64cart_probe(struct platform_device *pdev)
set_capacity(disk, size >> SECTOR_SHIFT);
set_disk_ro(disk, 1);
blk_queue_flag_set(QUEUE_FLAG_NONROT, queue);
blk_queue_physical_block_size(queue, 4096);
blk_queue_logical_block_size(queue, 4096);
blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue);
blk_queue_physical_block_size(disk->queue, 4096);
blk_queue_logical_block_size(disk->queue, 4096);
add_disk(disk);
pr_info("n64cart: %u kb disk\n", size / 1024);
return 0;
fail_queue:
blk_cleanup_queue(queue);
return err;
}
static struct platform_driver n64cart_driver = {