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iommu/arm-smmu-v3: Stop pre-zeroing batch commands in arm_smmu_atc_inv_master()

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Pre-zeroing the batched commands structure is inefficient, as individual
commands are zeroed later in arm_smmu_cmdq_build_cmd(). Therefore, only
the member 'num' needs to be initialized to 0.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20210817113411.1962-1-thunder.leizhen@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Zhen Lei 2021-08-17 19:34:11 +08:00 committed by Will Deacon
parent 5816b3e657
commit 93f9f7958f
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -1764,10 +1764,11 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
{ {
int i; int i;
struct arm_smmu_cmdq_ent cmd; struct arm_smmu_cmdq_ent cmd;
struct arm_smmu_cmdq_batch cmds = {}; struct arm_smmu_cmdq_batch cmds;
arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd); arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd);
cmds.num = 0;
for (i = 0; i < master->num_streams; i++) { for (i = 0; i < master->num_streams; i++) {
cmd.atc.sid = master->streams[i].id; cmd.atc.sid = master->streams[i].id;
arm_smmu_cmdq_batch_add(master->smmu, &cmds, &cmd); arm_smmu_cmdq_batch_add(master->smmu, &cmds, &cmd);