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authorChris Wright <chrisw@sous-sol.org>2010-04-02 18:27:53 -0700
committerJoerg Roedel <joerg.roedel@amd.com>2010-04-07 11:51:15 +0200
commit549c90dc9a6d659e792b2a42a0930c7da015ea4a (patch)
treee0d0115631aa40eb45b58fb24bdcd399d2e17e47 /arch/x86/kernel/amd_iommu_init.c
parent75f66533bc883f761a7adcab3281fe3323efbc90 (diff)
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_init.c')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 8975965f3e67..5edf41c7127c 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -438,7 +438,7 @@ static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
if (cmd_buf == NULL)
return NULL;
- iommu->cmd_buf_size = CMD_BUFFER_SIZE;
+ iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
return cmd_buf;
}
@@ -474,12 +474,13 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu)
&entry, sizeof(entry));
amd_iommu_reset_cmd_buffer(iommu);
+ iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
}
static void __init free_command_buffer(struct amd_iommu *iommu)
{
free_pages((unsigned long)iommu->cmd_buf,
- get_order(iommu->cmd_buf_size));
+ get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
}
/* allocates the memory where the IOMMU will log its events to */