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Subject[PATCH 4.20 176/183] staging: erofs: unzip_vle_lz4.c,utils.c: rectify BUG_ONs
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gao Xiang <gaoxiang25@huawei.com>

commit b8e076a6ef253e763bfdb81e5c72bcc828b0fbeb upstream.

remove all redundant BUG_ONs, and turn the rest
useful usages to DBG_BUGONs.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/staging/erofs/unzip_vle_lz4.c | 2 +-
drivers/staging/erofs/utils.c | 12 ++++++------
2 files changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/staging/erofs/unzip_vle_lz4.c
+++ b/drivers/staging/erofs/unzip_vle_lz4.c
@@ -57,7 +57,7 @@ int z_erofs_vle_plain_copy(struct page *
if (compressed_pages[j] != page)
continue;

- BUG_ON(mirrored[j]);
+ DBG_BUGON(mirrored[j]);
memcpy(percpu_data + j * PAGE_SIZE, dst, PAGE_SIZE);
mirrored[j] = true;
break;
--- a/drivers/staging/erofs/utils.c
+++ b/drivers/staging/erofs/utils.c
@@ -23,9 +23,6 @@ struct page *erofs_allocpage(struct list
list_del(&page->lru);
} else {
page = alloc_pages(gfp | __GFP_NOFAIL, 0);
-
- BUG_ON(page == NULL);
- BUG_ON(page->mapping != NULL);
}
return page;
}
@@ -58,7 +55,7 @@ repeat:
/* decrease refcount added by erofs_workgroup_put */
if (unlikely(oldcount == 1))
atomic_long_dec(&erofs_global_shrink_cnt);
- BUG_ON(index != grp->index);
+ DBG_BUGON(index != grp->index);
}
rcu_read_unlock();
return grp;
@@ -71,8 +68,11 @@ int erofs_register_workgroup(struct supe
struct erofs_sb_info *sbi;
int err;

- /* grp->refcount should not < 1 */
- BUG_ON(!atomic_read(&grp->refcount));
+ /* grp shouldn't be broken or used before */
+ if (unlikely(atomic_read(&grp->refcount) != 1)) {
+ DBG_BUGON(1);
+ return -EINVAL;
+ }

err = radix_tree_preload(GFP_NOFS);
if (err)

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