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Mon, 11 Jan 2021 03:30:34 -0800 Received: from MTKMBS07N2.mediatek.inc (172.21.101.141) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 11 Jan 2021 03:20:41 -0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 11 Jan 2021 19:20:39 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 11 Jan 2021 19:20:39 +0800 From: Yong Wu To: Joerg Roedel , Rob Herring , "Matthias Brugger" , Will Deacon , Robin Murphy Subject: [PATCH v6 07/33] iommu: Avoid reallocate default domain for a group Date: Mon, 11 Jan 2021 19:18:48 +0800 Message-ID: <20210111111914.22211-8-yong.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210111111914.22211-1-yong.wu@mediatek.com> References: <20210111111914.22211-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210111_063052_610069_F9D548D3 X-CRM114-Status: GOOD ( 13.94 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , srv_heupstream@mediatek.com, chao.hao@mediatek.com, linux-kernel@vger.kernel.org, Evan Green , yong.wu@mediatek.com, Tomasz Figa , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, Krzysztof Kozlowski , anan.sun@mediatek.com, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org If group->default_domain exists, avoid reallocate it. In some iommu drivers, there may be several devices share a group. Avoid realloc the default domain for this case. Signed-off-by: Yong Wu --- drivers/iommu/iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3d099a31ddca..f4b87e6abe80 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -266,7 +266,8 @@ int iommu_probe_device(struct device *dev) * support default domains, so the return value is not yet * checked. */ - iommu_alloc_default_domain(group, dev); + if (!group->default_domain) + iommu_alloc_default_domain(group, dev); if (group->default_domain) { ret = __iommu_attach_device(group->default_domain, dev);