linux-kernel - [PATCH] iommu/tegra-smmu: Use devm_bitmap

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Date:   Sun, 26 Sep 2021 15:07:18 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     thierry.reding@...il.com, vdumpa@...dia.com, joro@...tes.org,
        will@...nel.org, jonathanh@...dia.com
Cc:     linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] iommu/tegra-smmu: Use devm_bitmap_zalloc when applicable

'smmu->asids' is a bitmap. So use 'devm_kzalloc()' to simplify code,
improve the semantic of the code and avoid some open-coded arithmetic in
allocator arguments.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/iommu/tegra-smmu.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 0a281833f611..e900e3c46903 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -1079,7 +1079,6 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 				    struct tegra_mc *mc)
 {
 	struct tegra_smmu *smmu;
-	size_t size;
 	u32 value;
 	int err;
 
@@ -1097,9 +1096,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
 	 */
 	mc->smmu = smmu;
 
-	size = BITS_TO_LONGS(soc->num_asids) * sizeof(long);
-
-	smmu->asids = devm_kzalloc(dev, size, GFP_KERNEL);
+	smmu->asids = devm_bitmap_zalloc(dev, soc->num_asids, GFP_KERNEL);
 	if (!smmu->asids)
 		return ERR_PTR(-ENOMEM);
 
-- 
2.30.2