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Mon, 09 Jan 2017 12:04:12 +0000 (GMT) From: Marek Szyprowski To: iommu@lists.linux-foundation.org, linux-samsung-soc@vger.kernel.org Cc: Marek Szyprowski , Joerg Roedel , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz Subject: [PATCH v2 3/4] iommu/exynos: Ensure that SYSMMU is added only once to its master device Date: Mon, 09 Jan 2017 13:03:55 +0100 Message-id: <1483963436-29803-4-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1483963436-29803-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrCIsWRmVeSWpSXmKPExsWy7djP87q2NcURBtdu8lpsnLGe1WLBfmuL ztkb2C3OnwcSM87vY7JYe+QuuwObx5OD85g8Nq3qZPOYfGM5o0ffllWMHp83yQWwRnHZpKTm ZJalFunbJXBlbHzWxV5wm6ui+e9dxgbGnxxdjJwcEgImEo0v3jNC2GISF+6tZ+ti5OIQEljK KHHpRisThPOZUWLGksssMB2/1+9mhkgsY5T4Oms5C4TTwCQx4dU0NpAqNgFDia63XWC2iIC7 xPU/z8GKmAU2MEoc39PEDJIQFkiS2Lp6J5jNIqAqsfRNL9gKXgEPiQmL7jBBrJOTOHlsMiuI zSngKXH/5w+wmyQEnrNJ9HWfAmrmAHJkJTYdYIaod5GY1LWYFcIWlnh1fAs7hC0jcXlyN9QL /YwSTa3aEPYMRolzb3khbGuJw8cvgvUyC/BJTNo2HWo8r0RHmxBEiYfEr6+noMY7SjTsvA8N iTmMEgu/9jJOYJRZwMiwilEktbQ4Nz212ESvODG3uDQvXS85P3cTIzBuT/87/mUH4+JjVocY BTgYlXh4J3gVRQixJpYVV+YeYpTgYFYS4V1YURwhxJuSWFmVWpQfX1Sak1p8iFGag0VJnHfP givhQgLpiSWp2ampBalFMFkmDk6pBsZZ+tr3/s0x3bRAfsHlaefeV+Uu/dZkra7pL9px3WO7 iU5+e9DnG5dMDDdcCeMI4plWwh17aXZPU+qGZQbPPa6YKwmbZHPmL5nKtt35zdTpRbI37bxM OUz7cma33rqWPPPsGaO5er+urDj+y8fsec6bnP5HlWstmCXYjikmNq9bkqwVvvbB0jglluKM REMt5qLiRABvBQxo1wIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrCLMWRmVeSWpSXmKPExsVy+t/xq7omNcURBk/XKltsnLGe1WLBfmuL ztkb2C3OnwcSM87vY7JYe+QuuwObx5OD85g8Nq3qZPOYfGM5o0ffllWMHp83yQWwRrnZZKQm pqQWKaTmJeenZOal2yqFhrjpWigp5CXmptoqRej6hgQpKZQl5pQCeUYGaMDBOcA9WEnfLsEt Y+OzLvaC21wVzX/vMjYw/uToYuTkkBAwkfi9fjczhC0mceHeerYuRi4OIYEljBI/f/yHcpqY JJYfv8sCUsUmYCjR9baLDcQWEXCXuP7nOQtIEbPABkaJdTMmgI0SFkiSaFn3iQnEZhFQlVj6 phesmVfAQ2LCojtMEOvkJE4em8wKYnMKeErc//kDLC4EVHN0xU/2CYy8CxgZVjGKpJYW56bn FhvpFSfmFpfmpesl5+duYgSG8LZjP7fsYOx6F3yIUYCDUYmHd4JXUYQQa2JZcWXuIUYJDmYl Ed6FFcURQrwpiZVVqUX58UWlOanFhxhNgY6ayCwlmpwPjK+8knhDE0NzS0MjYwsLcyMjJXHe qR+uhAsJpCeWpGanphakFsH0MXFwSjUwnth0PMHs0+6krcq9/S83lm2zl2c4e9vk1euDiq8O 8sjOzvHvXPKddbuITZrKpfIHwRk8OtxZ7/5kTA38Ux46P9H9/CvTLB62uBjvKUbZh1MeyWSk JcZ9CT0x8ZxT8Azrh1PX1G9gv33WyDj29ve2vXcdWvbvOtBXsKw6oe3grZZVzMVCUbG/lViK MxINtZiLihMBDfuzUXcCAAA= X-MTR: 20000000000000000@CPGS X-CMS-MailID: 20170109120412eucas1p27f3aab2d42712a9783d79bb4e06d01d5 X-Msg-Generator: CA X-Sender-IP: 182.198.249.180 X-Local-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRs=?= =?UTF-8?B?7IK87ISx7KCE7J6QG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Global-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRtT?= =?UTF-8?B?YW1zdW5nIEVsZWN0cm9uaWNzG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Sender-Code: =?UTF-8?B?QzEwG0VIURtDMTBDRDAyQ0QwMjczOTI=?= CMS-TYPE: 201P X-HopCount: 7 X-CMS-RootMailID: 20170109120412eucas1p27f3aab2d42712a9783d79bb4e06d01d5 X-RootMTR: 20170109120412eucas1p27f3aab2d42712a9783d79bb4e06d01d5 References: <1483963436-29803-1-git-send-email-m.szyprowski@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org This patch prepares Exynos IOMMU driver for deferred probing support. Once it gets added, of_xlate() callback might be called more than once for the same SYSMMU controller and master device (for example it happens when masters device driver fails with EPROBE_DEFER). This patch adds a check, which ensures that SYSMMU controller is added to its master device (owner) only once. Signed-off-by: Marek Szyprowski --- drivers/iommu/exynos-iommu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index b0d537e6a445..8bf5a06a6c01 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1253,7 +1253,7 @@ static int exynos_iommu_of_xlate(struct device *dev, { struct exynos_iommu_owner *owner = dev->archdata.iommu; struct platform_device *sysmmu = of_find_device_by_node(spec->np); - struct sysmmu_drvdata *data; + struct sysmmu_drvdata *data, *entry; if (!sysmmu) return -ENODEV; @@ -1272,6 +1272,10 @@ static int exynos_iommu_of_xlate(struct device *dev, dev->archdata.iommu = owner; } + list_for_each_entry(entry, &owner->controllers, owner_node) + if (entry == data) + return 0; + list_add_tail(&data->owner_node, &owner->controllers); data->master = dev;