linux-kernel - Re: [PATCH v2] RDMA/umem: minor bug fix and cleanup in error handling paths

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Message-ID: <20190306013213.GA1662@ziepe.ca>
Date:   Tue, 5 Mar 2019 21:32:13 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Artemy Kovalyov <artemyko@...lanox.com>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        "john.hubbard@...il.com" <john.hubbard@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH v2] RDMA/umem: minor bug fix and cleanup in error
 handling paths

On Wed, Mar 06, 2019 at 03:02:36AM +0200, Artemy Kovalyov wrote:
> 
> 
> On 04/03/2019 00:37, John Hubbard wrote:
> > On 3/3/19 1:52 AM, Artemy Kovalyov wrote:
> > > 
> > > 
> > > On 02/03/2019 21:44, Ira Weiny wrote:
> > > > 
> > > > On Sat, Mar 02, 2019 at 12:24:35PM -0800, john.hubbard@...il.com wrote:
> > > > > From: John Hubbard <jhubbard@...dia.com>
> > > > > 
> > > > > ...
> > 
> > OK, thanks for explaining! Artemy, while you're here, any thoughts about the
> > release_pages, and the change of the starting point, from the other part of the
> > patch:
> > 
> > @@ -684,9 +677,11 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp,
> > u64 user_virt,
> > 	mutex_unlock(&umem_odp->umem_mutex);
> > 
> >    		if (ret < 0) {
> > -			/* Release left over pages when handling errors. */
> > -			for (++j; j < npages; ++j)
> release_pages() is an optimized batch put_page() so it's ok.
> but! release starting from page next to one cause failure in
> ib_umem_odp_map_dma_single_page() is correct because failure flow of this
> functions already called put_page().
> So release_pages(&local_page_list[j+1], npages - j-1) would be correct.

Someone send a fixup patch please...

Jason