* [PATCH] memory: samsung: exynos5422-dmc: Additional locking for 'curr_rate'
@ 2020-08-11 10:16 Lukasz Luba
0 siblings, 0 replies; 4+ messages in thread
From: Lukasz Luba @ 2020-08-11 10:16 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, linux-pm, linux-samsung-soc, krzk
Cc: kgene, lukasz.luba, b.zolnierkie
The 'curr_rate' is protected by local 'dmc->lock' in various places, but
not in a function exynos5_dmc_get_status(). The lock protects frequency
(and voltage) change process and the corresponding value stored in
'curr_rate'. Add the locking mechanism to protect the 'curr_rate' reading
also in the exynos5_dmc_get_status().
Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
drivers/memory/samsung/exynos5422-dmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index b9c7956e5031..952bc61e68f4 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -908,7 +908,10 @@ static int exynos5_dmc_get_status(struct device *dev,
int ret;
if (dmc->in_irq_mode) {
+ mutex_lock(&dmc->lock);
stat->current_frequency = dmc->curr_rate;
+ mutex_unlock(&dmc->lock);
+
stat->busy_time = dmc->load;
stat->total_time = dmc->total;
} else {
--
2.17.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH] memory: samsung: exynos5422-dmc: Additional locking for 'curr_rate'
@ 2020-08-11 10:17 Lukasz Luba
2020-08-17 11:54 ` Krzysztof Kozlowski
0 siblings, 1 reply; 4+ messages in thread
From: Lukasz Luba @ 2020-08-11 10:17 UTC (permalink / raw)
To: oss-self-reviewed-patches, linux-kernel, linux-arm-kernel,
linux-pm, linux-samsung-soc, krzk
Cc: kgene, lukasz.luba, b.zolnierkie
The 'curr_rate' is protected by local 'dmc->lock' in various places, but
not in a function exynos5_dmc_get_status(). The lock protects frequency
(and voltage) change process and the corresponding value stored in
'curr_rate'. Add the locking mechanism to protect the 'curr_rate' reading
also in the exynos5_dmc_get_status().
Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
drivers/memory/samsung/exynos5422-dmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index b9c7956e5031..952bc61e68f4 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -908,7 +908,10 @@ static int exynos5_dmc_get_status(struct device *dev,
int ret;
if (dmc->in_irq_mode) {
+ mutex_lock(&dmc->lock);
stat->current_frequency = dmc->curr_rate;
+ mutex_unlock(&dmc->lock);
+
stat->busy_time = dmc->load;
stat->total_time = dmc->total;
} else {
--
2.17.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] memory: samsung: exynos5422-dmc: Additional locking for 'curr_rate'
2020-08-11 10:17 Lukasz Luba
@ 2020-08-17 11:54 ` Krzysztof Kozlowski
2020-08-17 12:28 ` Lukasz Luba
0 siblings, 1 reply; 4+ messages in thread
From: Krzysztof Kozlowski @ 2020-08-17 11:54 UTC (permalink / raw)
To: Lukasz Luba
Cc: linux-samsung-soc, linux-pm, b.zolnierkie, linux-kernel,
oss-self-reviewed-patches, kgene, linux-arm-kernel
On Tue, Aug 11, 2020 at 11:17:27AM +0100, Lukasz Luba wrote:
> The 'curr_rate' is protected by local 'dmc->lock' in various places, but
> not in a function exynos5_dmc_get_status(). The lock protects frequency
> (and voltage) change process and the corresponding value stored in
> 'curr_rate'. Add the locking mechanism to protect the 'curr_rate' reading
> also in the exynos5_dmc_get_status().
>
> Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
> ---
> drivers/memory/samsung/exynos5422-dmc.c | 3 +++
Thanks, applied.
Best regards,
Krzysztof
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] memory: samsung: exynos5422-dmc: Additional locking for 'curr_rate'
2020-08-17 11:54 ` Krzysztof Kozlowski
@ 2020-08-17 12:28 ` Lukasz Luba
0 siblings, 0 replies; 4+ messages in thread
From: Lukasz Luba @ 2020-08-17 12:28 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: linux-samsung-soc, linux-pm, b.zolnierkie, linux-kernel,
oss-self-reviewed-patches, kgene, linux-arm-kernel
Hi Krzysztof,
On 8/17/20 12:54 PM, Krzysztof Kozlowski wrote:
> On Tue, Aug 11, 2020 at 11:17:27AM +0100, Lukasz Luba wrote:
>> The 'curr_rate' is protected by local 'dmc->lock' in various places, but
>> not in a function exynos5_dmc_get_status(). The lock protects frequency
>> (and voltage) change process and the corresponding value stored in
>> 'curr_rate'. Add the locking mechanism to protect the 'curr_rate' reading
>> also in the exynos5_dmc_get_status().
>>
>> Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
>> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
>> ---
>> drivers/memory/samsung/exynos5422-dmc.c | 3 +++
>
> Thanks, applied.
>
Thank you for applying it.
Regards,
Lukasz
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^ permalink raw reply [flat|nested] 4+ messages in thread
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