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From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Lukasz Luba <lukasz.luba@arm.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Alim Akhtar <alim.akhtar@samsung.com>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] memory: samsung: exynos5422-dmc: Avoid some over memory allocation
Date: Sun, 20 Mar 2022 08:10:30 +0100	[thread overview]
Message-ID: <69d7e69346986e2fdb994d4382954c932f9f0993.1647760213.git.christophe.jaillet@wanadoo.fr> (raw)

'dmc->counter' is a 'struct devfreq_event_dev **', so there is some
over memory allocation. 'counters_size' should be computed with
'sizeof(struct devfreq_event_dev *)'.

Use 'sizeof(*dmc->counter)' instead to fix it.

While at it, use devm_kcalloc() instead of devm_kzalloc()+open coded
multiplication.

Fixes: 6e7674c3c6df ("memory: Add DMC driver for Exynos5422")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
devm_kmalloc_array() could also be used to save a few cycles because the
array is fully initialized a few lines below.
---
 drivers/memory/samsung/exynos5422-dmc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 9c8318923ed0..4733e7898ffe 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1322,7 +1322,6 @@ static int exynos5_dmc_init_clks(struct exynos5_dmc *dmc)
  */
 static int exynos5_performance_counters_init(struct exynos5_dmc *dmc)
 {
-	int counters_size;
 	int ret, i;
 
 	dmc->num_counters = devfreq_event_get_edev_count(dmc->dev,
@@ -1332,8 +1331,8 @@ static int exynos5_performance_counters_init(struct exynos5_dmc *dmc)
 		return dmc->num_counters;
 	}
 
-	counters_size = sizeof(struct devfreq_event_dev) * dmc->num_counters;
-	dmc->counter = devm_kzalloc(dmc->dev, counters_size, GFP_KERNEL);
+	dmc->counter = devm_kcalloc(dmc->dev, dmc->num_counters,
+				    sizeof(*dmc->counter), GFP_KERNEL);
 	if (!dmc->counter)
 		return -ENOMEM;
 
-- 
2.32.0


WARNING: multiple messages have this Message-ID (diff)
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Lukasz Luba <lukasz.luba@arm.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Alim Akhtar <alim.akhtar@samsung.com>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] memory: samsung: exynos5422-dmc: Avoid some over memory allocation
Date: Sun, 20 Mar 2022 08:10:30 +0100	[thread overview]
Message-ID: <69d7e69346986e2fdb994d4382954c932f9f0993.1647760213.git.christophe.jaillet@wanadoo.fr> (raw)

'dmc->counter' is a 'struct devfreq_event_dev **', so there is some
over memory allocation. 'counters_size' should be computed with
'sizeof(struct devfreq_event_dev *)'.

Use 'sizeof(*dmc->counter)' instead to fix it.

While at it, use devm_kcalloc() instead of devm_kzalloc()+open coded
multiplication.

Fixes: 6e7674c3c6df ("memory: Add DMC driver for Exynos5422")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
devm_kmalloc_array() could also be used to save a few cycles because the
array is fully initialized a few lines below.
---
 drivers/memory/samsung/exynos5422-dmc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 9c8318923ed0..4733e7898ffe 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1322,7 +1322,6 @@ static int exynos5_dmc_init_clks(struct exynos5_dmc *dmc)
  */
 static int exynos5_performance_counters_init(struct exynos5_dmc *dmc)
 {
-	int counters_size;
 	int ret, i;
 
 	dmc->num_counters = devfreq_event_get_edev_count(dmc->dev,
@@ -1332,8 +1331,8 @@ static int exynos5_performance_counters_init(struct exynos5_dmc *dmc)
 		return dmc->num_counters;
 	}
 
-	counters_size = sizeof(struct devfreq_event_dev) * dmc->num_counters;
-	dmc->counter = devm_kzalloc(dmc->dev, counters_size, GFP_KERNEL);
+	dmc->counter = devm_kcalloc(dmc->dev, dmc->num_counters,
+				    sizeof(*dmc->counter), GFP_KERNEL);
 	if (!dmc->counter)
 		return -ENOMEM;
 
-- 
2.32.0


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             reply	other threads:[~2022-03-20  7:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-20  7:10 Christophe JAILLET [this message]
2022-03-20  7:10 ` [PATCH] memory: samsung: exynos5422-dmc: Avoid some over memory allocation Christophe JAILLET
2022-03-20 12:16 ` Krzysztof Kozlowski
2022-03-20 12:16   ` Krzysztof Kozlowski
2022-04-04 17:08 ` Krzysztof Kozlowski
2022-04-04 17:08   ` Krzysztof Kozlowski

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