linux-kernel - Re: [PATCH] iio: buffer: use dma_buf_unmap_attachment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20251115173145.7eab1467@jic23-huawei>
Date: Sat, 15 Nov 2025 17:31:45 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Nuno Sá <noname.nuno@...il.com>
Cc: Liang Jie <buaajxlj@....com>, David Lechner <dlechner@...libre.com>,
 Nuno Sá <nuno.sa@...log.com>, Andy Shevchenko	
 <andy@...nel.org>, "open list:IIO SUBSYSTEM AND DRIVERS"	
 <linux-iio@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 liangjie@...iang.com, fanggeng@...iang.com, yangchen11@...iang.com
Subject: Re: [PATCH] iio: buffer: use dma_buf_unmap_attachment_unlocked()
 helper

On Fri, 14 Nov 2025 09:07:33 +0000
Nuno Sá <noname.nuno@...il.com> wrote:

> On Fri, 2025-11-14 at 16:47 +0800, Liang Jie wrote:
> > From: Liang Jie <liangjie@...iang.com>
> > 
> > Replace open-coded dma_resv_lock()/dma_resv_unlock() around
> > dma_buf_unmap_attachment() in iio_buffer_dmabuf_release() with the
> > dma_buf_unmap_attachment_unlocked() helper.
> > 
> > This aligns with the standard DMA-BUF API, avoids duplicating
> > locking logic and eases future maintenance. No functional change.
> > 
> > Reviewed-by: fanggeng <fanggeng@...iang.com>
> > Signed-off-by: Liang Jie <liangjie@...iang.com>
> > ---  
> 
> Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Applied.

Thanks,

Jonathan

> 
> >  drivers/iio/industrialio-buffer.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> > index a80f7cc25a27..58330abbf40a 100644
> > --- a/drivers/iio/industrialio-buffer.c
> > +++ b/drivers/iio/industrialio-buffer.c
> > @@ -1563,9 +1563,7 @@ static void iio_buffer_dmabuf_release(struct kref *ref)
> >  	struct iio_buffer *buffer = priv->buffer;
> >  	struct dma_buf *dmabuf = attach->dmabuf;
> >  
> > -	dma_resv_lock(dmabuf->resv, NULL);
> > -	dma_buf_unmap_attachment(attach, priv->sgt, priv->dir);
> > -	dma_resv_unlock(dmabuf->resv);
> > +	dma_buf_unmap_attachment_unlocked(attach, priv->sgt, priv->dir);
> >  
> >  	buffer->access->detach_dmabuf(buffer, priv->block);
> >