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iommu/vt-d: fix bug in handling multiple RMRRs for the same PCI device

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Function dmar_iommu_notify_scope_dev() makes a wrong assumption that
there's one RMRR for each PCI device at most, which causes DMA failure
on some HP platforms. So enhance dmar_iommu_notify_scope_dev() to
handle multiple RMRRs for the same PCI device.

Fixbug: https://bugzilla.novell.com/show_bug.cgi?id=879482

Cc: <stable@vger.kernel.org> # 3.15
Reported-by: Tom Mingarelli <thomas.mingarelli@hp.com>
Tested-by: Linda Knippers <linda.knippers@hp.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jiang Liu 2014-06-20 15:08:06 +08:00 committed by Joerg Roedel
parent 7171511eae
commit 27e249501c
1 changed files with 3 additions and 6 deletions
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9
drivers/iommu/intel-iommu.c
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@ -3816,14 +3816,11 @@ int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
((void *)rmrr) + rmrr->header.length, ((void *)rmrr) + rmrr->header.length,
rmrr->segment, rmrru->devices, rmrr->segment, rmrru->devices,
rmrru->devices_cnt); rmrru->devices_cnt);
if (ret > 0) if(ret < 0)
break;
else if(ret < 0)
return ret; return ret;
} else if (info->event == BUS_NOTIFY_DEL_DEVICE) { } else if (info->event == BUS_NOTIFY_DEL_DEVICE) {
if (dmar_remove_dev_scope(info, rmrr->segment, dmar_remove_dev_scope(info, rmrr->segment,
rmrru->devices, rmrru->devices_cnt)) rmrru->devices, rmrru->devices_cnt);
break;
} }
} }