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Date: Mon, 15 Sep 2014 12:24:12 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jiang Liu <jiang.liu@...ux.intel.com>, David Woodhouse <dwmw2@...radead.org>, Joerg Roedel <jroedel@...e.de> Subject: [PATCH 3.16 013/158] iommu/vt-d: Defer domain removal if device is assigned to a driver 3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joerg Roedel <jroedel@...e.de> commit e7f9fa5498d91fcdc63d93007ba43f36b1a30538 upstream. When the BUS_NOTIFY_DEL_DEVICE event is received the device might still be attached to a driver. In this case the domain can't be released as the mappings might still be in use. Defer the domain removal in this case until we receivce the BUS_NOTIFY_UNBOUND_DRIVER event. Cc: Jiang Liu <jiang.liu@...ux.intel.com> Cc: David Woodhouse <dwmw2@...radead.org> Signed-off-by: Joerg Roedel <jroedel@...e.de> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/iommu/intel-iommu.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3891,6 +3891,14 @@ static int device_notifier(struct notifi action != BUS_NOTIFY_DEL_DEVICE) return 0; + /* + * If the device is still attached to a device driver we can't + * tear down the domain yet as DMA mappings may still be in use. + * Wait for the BUS_NOTIFY_UNBOUND_DRIVER event to do that. + */ + if (action == BUS_NOTIFY_DEL_DEVICE && dev->driver != NULL) + return 0; + domain = find_domain(dev); if (!domain) return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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