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t=1605652866; bh=aesflSSYIio9RUvTzHtgIgEoBgRRVoXJ8Ijz+a/sfyI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=uS3dCUKL6WFxURM7zFODhozxOOvUIRtS5/nhXQgMIIRf00VUQ+S2X+GvIrcTVSiNf tsRxeURBO1Q2jzx7d7dPMBxKja0S1W9Am/ZpO07cm3BAMZlZBvCfQ9S1TRLVRBgHum 53Aa+N9+/selE+q+CxLJsVann3TpX5J16I2ODveI= Date: Tue, 17 Nov 2020 22:41:02 +0000 From: Will Deacon To: Yang Yingliang Subject: Re: [PATCH] iommu: fix return error code in iommu_probe_device() Message-ID: <20201117224102.GD524@willie-the-truck> References: <20201117025238.3425422-1-yangyingliang@huawei.com> <835ab066-b6b8-a211-4941-c01781031de8@linux.intel.com> <454f5e3e-c380-e8a5-9283-3f7578eb601e@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <454f5e3e-c380-e8a5-9283-3f7578eb601e@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Nov 17, 2020 at 07:11:28PM +0800, Yang Yingliang wrote: > On 2020/11/17 17:40, Lu Baolu wrote: > > On 2020/11/17 10:52, Yang Yingliang wrote: > > > If iommu_group_get() failed, it need return error code > > > in iommu_probe_device(). > > > = > > > Fixes: cf193888bfbd ("iommu: Move new probe_device path...") > > > Reported-by: Hulk Robot > > > Signed-off-by: Yang Yingliang > > > --- > > > =A0 drivers/iommu/iommu.c | 4 +++- > > > =A0 1 file changed, 3 insertions(+), 1 deletion(-) > > > = > > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > > > index b53446bb8c6b..6f4a32df90f6 100644 > > > --- a/drivers/iommu/iommu.c > > > +++ b/drivers/iommu/iommu.c > > > @@ -253,8 +253,10 @@ int iommu_probe_device(struct device *dev) > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0 goto err_out; > > > =A0 =A0=A0=A0=A0=A0 group =3D iommu_group_get(dev); > > > -=A0=A0=A0 if (!group) > > > +=A0=A0=A0 if (!group) { > > > +=A0=A0=A0=A0=A0=A0=A0 ret =3D -ENODEV; > > = > > Can you please explain why you use -ENODEV here? > = > Before 79659190ee97 ("iommu: Don't take group reference in > iommu_alloc_default_domain()"), in > = > iommu_alloc_default_domain(), if group is NULL, it will return -ENODEV. Hmm. While I think the patch is ok, I'm not sure it qualifies as a fix. Has iommu_probe_device() ever propagated this error? The commit you identify in the 'Fixes:' tag doesn't seem to change this afaict. Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu