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Subject[PATCH v3 3/9] Uprobe: Move mmput() into free_map_info()
Date
From: Oleg Nesterov <oleg@redhat.com>

build_map_info() has a side effect like one need to perform
mmput() when done with the mm. Add mmput() in free_map_info()
so that user does not have to call it explicitly.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
kernel/events/uprobes.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 535fd39..1d439c7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -704,6 +704,7 @@ struct map_info {
static inline struct map_info *free_map_info(struct map_info *info)
{
struct map_info *next = info->next;
+ mmput(info->mm);
kfree(info);
return next;
}
@@ -773,8 +774,11 @@ static inline struct map_info *free_map_info(struct map_info *info)

goto again;
out:
- while (prev)
- prev = free_map_info(prev);
+ while (prev) {
+ info = prev;
+ prev = prev->next;
+ kfree(info);
+ }
return curr;
}

@@ -824,7 +828,6 @@ static inline struct map_info *free_map_info(struct map_info *info)
unlock:
up_write(&mm->mmap_sem);
free:
- mmput(mm);
info = free_map_info(info);
}
out:
--
1.8.3.1
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