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| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-09-02 14:10:32 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-09-02 14:10:32 +0200 |
| commit | f1ca1512e765337a7c09eb875eedef8ea4e07654 (patch) | |
| tree | 79bc491e98ab55af1575a3e4dec8e31f1f32be62 /drivers/iommu | |
| parent | c6a389f123b9f68d605bb7e0f9b32ec1e3e14132 (diff) | |
| download | linux-f1ca1512e765337a7c09eb875eedef8ea4e07654.tar.bz2 | |
iommu/amd: Make sure iommu->need_sync contains correct value
The value is only set to true but never set back to false,
which causes to many completion-wait commands to be sent to
hardware. Fix it with this patch.
Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index a14f8dc23462..45652231dae8 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -605,7 +605,9 @@ static void build_inv_all(struct iommu_cmd *cmd) * Writes the command to the IOMMUs command buffer and informs the * hardware about the new command. */ -static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) +static int iommu_queue_command_sync(struct amd_iommu *iommu, + struct iommu_cmd *cmd, + bool sync) { u32 left, tail, head, next_tail; unsigned long flags; @@ -639,13 +641,18 @@ again: copy_cmd_to_buffer(iommu, cmd, tail); /* We need to sync now to make sure all commands are processed */ - iommu->need_sync = true; + iommu->need_sync = sync; spin_unlock_irqrestore(&iommu->lock, flags); return 0; } +static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) +{ + return iommu_queue_command_sync(iommu, cmd, true); +} + /* * This function queues a completion wait command into the command * buffer of an IOMMU @@ -661,7 +668,7 @@ static int iommu_completion_wait(struct amd_iommu *iommu) build_completion_wait(&cmd, (u64)&sem); - ret = iommu_queue_command(iommu, &cmd); + ret = iommu_queue_command_sync(iommu, &cmd, false); if (ret) return ret; |