On Sun, Jan 01, 2017 at 08:47:12AM +0200, Leon Romanovsky wrote:

Date: Sun, 1 Jan 2017 08:47:12 +0200
From: Leon Romanovsky <redacted>
To: Kenneth Lee <liguozhu-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
CC: dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
 robin.murphy-5wv7dgnIgG8@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, egtvedt-BrfabpQBY5qlHtIdYg32fQ@public.gmane.org,
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 linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v3] IB/umem: Release pid in error and ODP flow
User-Agent: Mutt/1.7.2 (2016-11-26)
Message-ID: [off-list ref]

On Fri, Dec 30, 2016 at 06:18:29PM +0800, Kenneth Lee wrote:

quoted

There are two bugfixes in this patch:

Fixes: 87773dd56d54 ("IB: ib_umem_release() should decrement mm->pinned_vm from ib_umem_get")
	This patch introduce the get_task_pid but not put it back on all error
	path

Fixes: 8ada2c1c0c1d ("IB/core: Add support for on demand paging regions")
	This patch introduce a ODP flow without release pid before enter it


Signed-off-by: Kenneth Lee <liguozhu-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
Reviewed-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
Change from v1 to v2:
  Correcting the patch title and description
Change from v2 to v3:
  Update the title and add "Fixes" fields in the description

OK,

I see that you still didn't read Documentation/SubmittingPatches. You
must read that document before you are sending patches.

But I'll stop here, the code is correct (it fixes bugs) and commit message
more usefull than before.

quoted

 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

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Thanks,

I did read the doc, but maybe I mis-understant some points. Could you please
point it out?

And sorry. please ignore the last message. I forget to use a bottom-post style.



-- 
			-Kenneth(Hisilicon)
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