diff mbox

[v3,6/10] mmc: meson-gx: fix error path in meson_mmc_clk_init / meson_mmc_probe

Message ID 8419d592-1338-d7eb-3a75-342b64897922@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Heiner Kallweit Feb. 18, 2017, 1:19 p.m. UTC
The condition should be "if (ret)" as the disable/unprepare is
supposed to be executed if the previous command fails.
In addition adjust the error path in probe to properly deal
with the case that cfg_div_clk can be registered successfully
but enable/prepare fails.
In this case we shouldn't call clk_disable_unprepare.

Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- extended commit message
v3:
- adjust error path in probe
---
 drivers/mmc/host/meson-gx-mmc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Comments

Michał Zegan Feb. 18, 2017, 1:57 p.m. UTC | #1
W dniu 18.02.2017 o 14:19, Heiner Kallweit pisze:
> The condition should be "if (ret)" as the disable/unprepare is
> supposed to be executed if the previous command fails.
> In addition adjust the error path in probe to properly deal
> with the case that cfg_div_clk can be registered successfully
> but enable/prepare fails.
> In this case we shouldn't call clk_disable_unprepare.
> 
> Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> v2:
> - extended commit message
> v3:
> - adjust error path in probe
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..002e4aac 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -321,7 +321,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
>  	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> +	if (ret)
>  		clk_disable_unprepare(host->cfg_div_clk);
>  
>  	return ret;
> @@ -771,7 +771,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  					meson_mmc_irq_thread, IRQF_SHARED,
>  					DRIVER_NAME, host);
>  	if (ret)
> -		goto free_host;
> +		goto err_div_clk;
>  
>  	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
>  	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
> @@ -784,7 +784,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  	if (host->bounce_buf == NULL) {
>  		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
>  		ret = -ENOMEM;
> -		goto free_host;
> +		goto err_div_clk;
>  	}
>  
>  	mmc->ops = &meson_mmc_ops;
> @@ -792,8 +792,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> -free_host:
> +err_div_clk:
>  	clk_disable_unprepare(host->cfg_div_clk);
> +free_host:
>  	clk_disable_unprepare(host->core_clk);
>  	mmc_free_host(mmc);
>  	return ret;
> 
Doesn't the same problem exist with a core clock? It also could error
when being enabled, and it will be disabled even if not enabled before...
Heiner Kallweit Feb. 18, 2017, 3:22 p.m. UTC | #2
Am 18.02.2017 um 14:57 schrieb Michał Zegan:
> 
> 
> W dniu 18.02.2017 o 14:19, Heiner Kallweit pisze:
>> The condition should be "if (ret)" as the disable/unprepare is
>> supposed to be executed if the previous command fails.
>> In addition adjust the error path in probe to properly deal
>> with the case that cfg_div_clk can be registered successfully
>> but enable/prepare fails.
>> In this case we shouldn't call clk_disable_unprepare.
>>
>> Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>> ---
>> v2:
>> - extended commit message
>> v3:
>> - adjust error path in probe
>> ---
>>  drivers/mmc/host/meson-gx-mmc.c | 9 +++++----
>>  1 file changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>> index 68e76fa8..002e4aac 100644
>> --- a/drivers/mmc/host/meson-gx-mmc.c
>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>> @@ -321,7 +321,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>  
>>  	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>> -	if (!ret)
>> +	if (ret)
>>  		clk_disable_unprepare(host->cfg_div_clk);
>>  
>>  	return ret;
>> @@ -771,7 +771,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>  					meson_mmc_irq_thread, IRQF_SHARED,
>>  					DRIVER_NAME, host);
>>  	if (ret)
>> -		goto free_host;
>> +		goto err_div_clk;
>>  
>>  	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
>>  	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
>> @@ -784,7 +784,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>  	if (host->bounce_buf == NULL) {
>>  		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
>>  		ret = -ENOMEM;
>> -		goto free_host;
>> +		goto err_div_clk;
>>  	}
>>  
>>  	mmc->ops = &meson_mmc_ops;
>> @@ -792,8 +792,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>  
>>  	return 0;
>>  
>> -free_host:
>> +err_div_clk:
>>  	clk_disable_unprepare(host->cfg_div_clk);
>> +free_host:
>>  	clk_disable_unprepare(host->core_clk);
>>  	mmc_free_host(mmc);
>>  	return ret;
>>
> Doesn't the same problem exist with a core clock? It also could error
> when being enabled, and it will be disabled even if not enabled before...
> 
Yes, there it's basically the same issue. Feel free to submit a patch.

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Michał Zegan Feb. 18, 2017, 3:30 p.m. UTC | #3
W dniu 18.02.2017 o 16:22, Heiner Kallweit pisze:
> Am 18.02.2017 um 14:57 schrieb Michał Zegan:
>>
>>
>> W dniu 18.02.2017 o 14:19, Heiner Kallweit pisze:
>>> The condition should be "if (ret)" as the disable/unprepare is
>>> supposed to be executed if the previous command fails.
>>> In addition adjust the error path in probe to properly deal
>>> with the case that cfg_div_clk can be registered successfully
>>> but enable/prepare fails.
>>> In this case we shouldn't call clk_disable_unprepare.
>>>
>>> Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
>>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>>> ---
>>> v2:
>>> - extended commit message
>>> v3:
>>> - adjust error path in probe
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 9 +++++----
>>>  1 file changed, 5 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 68e76fa8..002e4aac 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -321,7 +321,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>>>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>>>  
>>>  	ret = meson_mmc_clk_set(host, host->mmc->f_min);
>>> -	if (!ret)
>>> +	if (ret)
>>>  		clk_disable_unprepare(host->cfg_div_clk);
>>>  
>>>  	return ret;
>>> @@ -771,7 +771,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>>  					meson_mmc_irq_thread, IRQF_SHARED,
>>>  					DRIVER_NAME, host);
>>>  	if (ret)
>>> -		goto free_host;
>>> +		goto err_div_clk;
>>>  
>>>  	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
>>>  	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
>>> @@ -784,7 +784,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>>  	if (host->bounce_buf == NULL) {
>>>  		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
>>>  		ret = -ENOMEM;
>>> -		goto free_host;
>>> +		goto err_div_clk;
>>>  	}
>>>  
>>>  	mmc->ops = &meson_mmc_ops;
>>> @@ -792,8 +792,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>>  
>>>  	return 0;
>>>  
>>> -free_host:
>>> +err_div_clk:
>>>  	clk_disable_unprepare(host->cfg_div_clk);
>>> +free_host:
>>>  	clk_disable_unprepare(host->core_clk);
>>>  	mmc_free_host(mmc);
>>>  	return ret;
>>>
>> Doesn't the same problem exist with a core clock? It also could error
>> when being enabled, and it will be disabled even if not enabled before...
>>
> Yes, there it's basically the same issue. Feel free to submit a patch.
> 
Okay, I will submit a patch based on this series to fix that too, thanks.
Reviewed-by: Michał Zegan <webczat@webczatnet.pl>
Kevin Hilman Feb. 28, 2017, 3:06 a.m. UTC | #4
Heiner Kallweit <hkallweit1@gmail.com> writes:

> The condition should be "if (ret)" as the disable/unprepare is
> supposed to be executed if the previous command fails.
> In addition adjust the error path in probe to properly deal
> with the case that cfg_div_clk can be registered successfully
> but enable/prepare fails.
> In this case we shouldn't call clk_disable_unprepare.
>
> Reported-by: Michał Zegan <webczat_200@poczta.onet.pl>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Acked-by: Kevin Hilman <khilman@baylibre.com>

> ---
> v2:
> - extended commit message
> v3:
> - adjust error path in probe
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 68e76fa8..002e4aac 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -321,7 +321,7 @@ static int meson_mmc_clk_init(struct meson_host *host)
>  	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
>  
>  	ret = meson_mmc_clk_set(host, host->mmc->f_min);
> -	if (!ret)
> +	if (ret)
>  		clk_disable_unprepare(host->cfg_div_clk);
>  
>  	return ret;
> @@ -771,7 +771,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  					meson_mmc_irq_thread, IRQF_SHARED,
>  					DRIVER_NAME, host);
>  	if (ret)
> -		goto free_host;
> +		goto err_div_clk;
>  
>  	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
>  	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
> @@ -784,7 +784,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  	if (host->bounce_buf == NULL) {
>  		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
>  		ret = -ENOMEM;
> -		goto free_host;
> +		goto err_div_clk;
>  	}
>  
>  	mmc->ops = &meson_mmc_ops;
> @@ -792,8 +792,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> -free_host:
> +err_div_clk:
>  	clk_disable_unprepare(host->cfg_div_clk);
> +free_host:
>  	clk_disable_unprepare(host->core_clk);
>  	mmc_free_host(mmc);
>  	return ret;
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diff mbox

Patch

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 68e76fa8..002e4aac 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -321,7 +321,7 @@  static int meson_mmc_clk_init(struct meson_host *host)
 	host->mmc->f_min = clk_round_rate(host->cfg_div_clk, 400000);
 
 	ret = meson_mmc_clk_set(host, host->mmc->f_min);
-	if (!ret)
+	if (ret)
 		clk_disable_unprepare(host->cfg_div_clk);
 
 	return ret;
@@ -771,7 +771,7 @@  static int meson_mmc_probe(struct platform_device *pdev)
 					meson_mmc_irq_thread, IRQF_SHARED,
 					DRIVER_NAME, host);
 	if (ret)
-		goto free_host;
+		goto err_div_clk;
 
 	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
 	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
@@ -784,7 +784,7 @@  static int meson_mmc_probe(struct platform_device *pdev)
 	if (host->bounce_buf == NULL) {
 		dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
 		ret = -ENOMEM;
-		goto free_host;
+		goto err_div_clk;
 	}
 
 	mmc->ops = &meson_mmc_ops;
@@ -792,8 +792,9 @@  static int meson_mmc_probe(struct platform_device *pdev)
 
 	return 0;
 
-free_host:
+err_div_clk:
 	clk_disable_unprepare(host->cfg_div_clk);
+free_host:
 	clk_disable_unprepare(host->core_clk);
 	mmc_free_host(mmc);
 	return ret;