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| author | Chris Wright <chrisw@sous-sol.org> | 2010-04-03 03:27:53 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2010-04-07 11:51:15 +0200 |
| commit | 549c90dc9a6d659e792b2a42a0930c7da015ea4a (patch) | |
| tree | e0d0115631aa40eb45b58fb24bdcd399d2e17e47 /arch/x86/kernel/amd_iommu.c | |
| parent | x86/amd-iommu: enable iommu before attaching devices (diff) | |
| download | linux-549c90dc9a6d659e792b2a42a0930c7da015ea4a.tar.xz linux-549c90dc9a6d659e792b2a42a0930c7da015ea4a.zip | |
x86/amd-iommu: warn when issuing command to uninitialized cmd buffer
To catch future potential issues we can add a warning whenever we issue
a command before the command buffer is fully initialized.
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
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 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index b06f29e275e9..71dfc0af8e50 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -392,6 +392,7 @@ static int __iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) u32 tail, head; u8 *target; + WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED); tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); target = iommu->cmd_buf + tail; memcpy_toio(target, cmd, sizeof(*cmd)); |