diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-09-03 15:08:09 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-09-03 15:55:35 +0200 |
| commit | b26e81b871bd18184968f0bb3f12945906eadfce (patch) | |
| tree | ee8b734952e0bfb6386d7edbff797f4192cdb062 /arch/x86/kernel/amd_iommu.c | |
| parent | a345b23b79f1900e7d87c3165182504419180de4 (diff) | |
| download | lwn-b26e81b871bd18184968f0bb3f12945906eadfce.tar.gz lwn-b26e81b871bd18184968f0bb3f12945906eadfce.zip | |
x86/amd-iommu: Panic if IOMMU command buffer reset fails
To prevent the driver from doing recursive command buffer
resets, just panic when that recursion happens.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 2333d615f5ee..b62a2f64dfc5 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -553,9 +553,16 @@ static void reset_iommu_command_buffer(struct amd_iommu *iommu) { pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); + if (iommu->reset_in_progress) + panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n"); + + iommu->reset_in_progress = true; + amd_iommu_reset_cmd_buffer(iommu); flush_all_devices_for_iommu(iommu); flush_all_domains_on_iommu(iommu); + + iommu->reset_in_progress = false; } /**************************************************************************** |