[PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

[PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

[Kenneth Lee]

There are two bugfixes in this patch:

1. When the execution go to the ib_umem_odp_get() path, pid should be put
   back.
2. When the memory allocation fail, the pid also should be put back before
   exit.

Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
---
 drivers/infiniband/core/umem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 1e62a5f..4609b92 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -134,6 +134,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 		 IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND));
 
 	if (access & IB_ACCESS_ON_DEMAND) {
+		put_pid(umem->pid);
 		ret = ib_umem_odp_get(context, umem);
 		if (ret) {
 			kfree(umem);
@@ -149,6 +150,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 
 	page_list = (struct page **) __get_free_page(GFP_KERNEL);
 	if (!page_list) {
+		put_pid(umem->pid);
 		kfree(umem);
 		return ERR_PTR(-ENOMEM);
 	}
-- 
1.9.1

Re: [PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

[Leon Romanovsky]

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On Thu, Dec 29, 2016 at 10:24:43AM +0800, Kenneth Lee wrote:
> There are two bugfixes in this patch:
>
> 1. When the execution go to the ib_umem_odp_get() path, pid should be put
>    back.
> 2. When the memory allocation fail, the pid also should be put back before
>    exit.
>
> Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>

Hi Kenneth,

Thank you for resubmitting it. This fix is important and no doubts that
it will be accepted, however you need to improve the patch a little bit
more.

CAn you please resubmit it according to Documentation/SubmittingPatches
and reviewers feedback?

Haggai's Reviewed-by tag, Fixes, changelog, version in title and
proper title (see it in git log for this subsystems).

Thanks

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