Hi,
I'm puzzled by commit f9a67b1182e5 ("md/bitmap: clear bitmap if
bitmap_create failed").
Part of the commit is:
@@ -1865,8 +1866,10 @@ int bitmap_copy_from_slot(struct mddev *mddev,
int slot,
struct bitmap_counts *counts;
struct bitmap *bitmap = bitmap_create(mddev, slot);
- if (IS_ERR(bitmap))
+ if (IS_ERR(bitmap)) {
+ bitmap_free(bitmap);
return PTR_ERR(bitmap);
+ }
but if 'bitmap' is an error, I think that bad things will happen in
'bitmap_free()' when, at the beginning of the function, we will execute:
if (bitmap->sysfs_can_clear) <-----------------
sysfs_put(bitmap->sysfs_can_clear);
However, the commit log message is really explicit and adding this call
to 'bitmap_free' has really been done one purpose. ("If bitmap_create
returns an error, we need to call either bitmap_destroy or bitmap_free
to do clean up, ...")
It is also not consistent with the comment before function bitmap_create():
* if this returns an error, bitmap_destroy must be called to do
clean up
* once mddev->bitmap is set
I may have missed something, but I don't see what.
Is this commit correct?
Best regards,
CJ
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