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Date: Thu, 25 Sep 2014 11:15:44 -0400 From: Mark Salter <msalter@...hat.com> To: Joerg Roedel <joro@...tes.org> Cc: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Suravee Suthikulpanit <Suravee.Suthikulpanit@....com> Subject: Re: [PATCH] iommu/core: fix bus notifier breakage On Thu, 2014-09-25 at 16:47 +0200, Joerg Roedel wrote: > On Sun, Sep 21, 2014 at 01:58:24PM -0400, Mark Salter wrote: > > iommu_bus_init() registers a bus notifier on the given bus by using > > a statically defined notifier block: > > > > static struct notifier_block iommu_bus_nb = { > > .notifier_call = iommu_bus_notifier, > > }; > > > > This same notifier block is used for all busses. This causes a > > problem for notifiers registered after iommu has registered this > > callback on multiple busses. The problem is that a subsequent > > notifier being registered on a bus which has this iommu notifier > > will also get linked in to the notifier list of all other busses > > which have this iommu notifier. > > > > This patch fixes this by allocating the notifier_block at runtime. > > Some error checking is also added to catch any allocation failure > > or notifier registration error. > > > > Signed-off-by: Mark Salter <msalter@...hat.com> > > --- > > drivers/iommu/iommu.c | 26 ++++++++++++++++---------- > > 1 file changed, 16 insertions(+), 10 deletions(-) > > Makes sense, applied. Where have you hit this condition where IOMMUs for > different buses are registered? arm_smmu_init() /* Oh, for a proper bus abstraction */ if (!iommu_present(&platform_bus_type)) bus_set_iommu(&platform_bus_type, &arm_smmu_ops); #ifdef CONFIG_ARM_AMBA if (!iommu_present(&amba_bustype)) bus_set_iommu(&amba_bustype, &arm_smmu_ops); #endif #ifdef CONFIG_PCI if (!iommu_present(&pci_bus_type)) bus_set_iommu(&pci_bus_type, &arm_smmu_ops); #endif -- 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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