From: Jason Gunthorpe <jgg@nvidia.com>
To: Robin Murphy <robin.murphy@arm.com>
Cc: joro@8bytes.org, will@kernel.org, linux@armlinux.org.uk,
iommu@lists.linux.dev, linux-tegra@vger.kernel.org,
Jon Hunter <jonathanh@nvidia.com>
Subject: Re: [PATCH] iommu: Ensure .iotlb_sync is called correctly
Date: Wed, 8 Apr 2026 13:28:46 -0300 [thread overview]
Message-ID: <20260408162846.GE3357077@nvidia.com> (raw)
In-Reply-To: <8982e3412563cf91e106d59228dfb6115024c75e.1775659257.git.robin.murphy@arm.com>
On Wed, Apr 08, 2026 at 03:40:57PM +0100, Robin Murphy wrote:
> Many drivers have no reason to use the iotlb_gather mechanism, but do
> still depend on .iotlb_sync being called to properly complete an unmap.
> Since the core code is now relying on the gather to detect when there
> is legitimately something to sync, it should also take care of encoding
> a successful unmap when the driver does not touch the gather itself.
>
> Fixes: 90c5def10bea ("iommu: Do not call drivers for empty gathers")
> Reported-by: Jon Hunter <jonathanh@nvidia.com>
> Closes: https://lore.kernel.org/r/8800a38b-8515-4bbe-af15-0dae81274bf7@nvidia.com
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
> drivers/iommu/iommu.c | 6 ++++++
> 1 file changed, 6 insertions(+)
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2026-04-08 16:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-08 14:40 [PATCH] iommu: Ensure .iotlb_sync is called correctly Robin Murphy
2026-04-08 16:28 ` Jason Gunthorpe [this message]
2026-04-08 17:28 ` Jon Hunter
2026-04-08 19:55 ` Russell King (Oracle)
2026-04-09 13:01 ` Will Deacon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260408162846.GE3357077@nvidia.com \
--to=jgg@nvidia.com \
--cc=iommu@lists.linux.dev \
--cc=jonathanh@nvidia.com \
--cc=joro@8bytes.org \
--cc=linux-tegra@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=robin.murphy@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox