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* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-07 12:03 ` Sylwester Nawrocki
  0 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-07 12:03 UTC (permalink / raw)
  To: sachin.kamat
  Cc: linux-samsung-soc, linux-arm-kernel, mturquette, tomasz.figa,
	Sylwester Nawrocki

Ensure clk->kref is dereferenced only when clk is not NULL.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
Hi Sachin,

please try if this patch fixes the exyno5420 boot crash.

Thanks,
Sylwester

 drivers/clk/clk.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e3e0327..a1fe86f 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
  */
 int __clk_get(struct clk *clk)
 {
-	if (clk && !try_module_get(clk->owner))
-		return 0;
+	if (clk) {
+		if (!try_module_get(clk->owner))
+			return 0;

-	kref_get(&clk->ref);
+		kref_get(&clk->ref);
+	}
 	return 1;
 }

 void __clk_put(struct clk *clk)
 {
-	if (WARN_ON_ONCE(IS_ERR(clk)))
+	if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
 		return;

 	clk_prepare_lock();
 	kref_put(&clk->ref, __clk_release);
 	clk_prepare_unlock();

-	if (clk)
-		module_put(clk->owner);
+	module_put(clk->owner);
 }

 /***        clk rate change notifiers        ***/
--
1.7.9.5

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-07 12:03 ` Sylwester Nawrocki
  0 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-07 12:03 UTC (permalink / raw)
  To: linux-arm-kernel

Ensure clk->kref is dereferenced only when clk is not NULL.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
Hi Sachin,

please try if this patch fixes the exyno5420 boot crash.

Thanks,
Sylwester

 drivers/clk/clk.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e3e0327..a1fe86f 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
  */
 int __clk_get(struct clk *clk)
 {
-	if (clk && !try_module_get(clk->owner))
-		return 0;
+	if (clk) {
+		if (!try_module_get(clk->owner))
+			return 0;

-	kref_get(&clk->ref);
+		kref_get(&clk->ref);
+	}
 	return 1;
 }

 void __clk_put(struct clk *clk)
 {
-	if (WARN_ON_ONCE(IS_ERR(clk)))
+	if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
 		return;

 	clk_prepare_lock();
 	kref_put(&clk->ref, __clk_release);
 	clk_prepare_unlock();

-	if (clk)
-		module_put(clk->owner);
+	module_put(clk->owner);
 }

 /***        clk rate change notifiers        ***/
--
1.7.9.5

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-07 12:03 ` Sylwester Nawrocki
@ 2014-01-07 13:00   ` Lothar Waßmann
  -1 siblings, 0 replies; 20+ messages in thread
From: Lothar Waßmann @ 2014-01-07 13:00 UTC (permalink / raw)
  To: Sylwester Nawrocki
  Cc: sachin.kamat, linux-samsung-soc, mturquette, tomasz.figa,
	linux-arm-kernel

Hi,

Sylwester Nawrocki wrote:
> Ensure clk->kref is dereferenced only when clk is not NULL.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> ---
> Hi Sachin,
> 
> please try if this patch fixes the exyno5420 boot crash.
> 
> Thanks,
> Sylwester
> 
>  drivers/clk/clk.c |   13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index e3e0327..a1fe86f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>   */
>  int __clk_get(struct clk *clk)
>  {
> -	if (clk && !try_module_get(clk->owner))
> -		return 0;
> +	if (clk) {
> +		if (!try_module_get(clk->owner))
> +			return 0;
> 
This change is unnecessary! The part after the && is only evaluated
when clk is not NULL.

Lothar Waßmann
-- 
___________________________________________________________

Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Geschäftsführer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996

www.karo-electronics.de | info@karo-electronics.de
___________________________________________________________

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-07 13:00   ` Lothar Waßmann
  0 siblings, 0 replies; 20+ messages in thread
From: Lothar Waßmann @ 2014-01-07 13:00 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,

Sylwester Nawrocki wrote:
> Ensure clk->kref is dereferenced only when clk is not NULL.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> ---
> Hi Sachin,
> 
> please try if this patch fixes the exyno5420 boot crash.
> 
> Thanks,
> Sylwester
> 
>  drivers/clk/clk.c |   13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index e3e0327..a1fe86f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>   */
>  int __clk_get(struct clk *clk)
>  {
> -	if (clk && !try_module_get(clk->owner))
> -		return 0;
> +	if (clk) {
> +		if (!try_module_get(clk->owner))
> +			return 0;
> 
This change is unnecessary! The part after the && is only evaluated
when clk is not NULL.

Lothar Wa?mann
-- 
___________________________________________________________

Ka-Ro electronics GmbH | Pascalstra?e 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Gesch?ftsf?hrer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996

www.karo-electronics.de | info at karo-electronics.de
___________________________________________________________

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-07 13:00   ` Lothar Waßmann
@ 2014-01-07 13:14     ` Sylwester Nawrocki
  -1 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-07 13:14 UTC (permalink / raw)
  To: Lothar Waßmann
  Cc: sachin.kamat, linux-samsung-soc, mturquette, tomasz.figa,
	linux-arm-kernel

Hi,

On 07/01/14 14:00, Lothar Waßmann wrote:
> Sylwester Nawrocki wrote:
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Thanks,
>> Sylwester
>>
>>  drivers/clk/clk.c |   13 +++++++------
>>  1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
>> index e3e0327..a1fe86f 100644
>> --- a/drivers/clk/clk.c
>> +++ b/drivers/clk/clk.c
>> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>>   */
>>  int __clk_get(struct clk *clk)
>>  {
>> -	if (clk && !try_module_get(clk->owner))
>> -		return 0;
>> +	if (clk) {
>> +		if (!try_module_get(clk->owner))
>> +			return 0;
>>
> This change is unnecessary! The part after the && is only evaluated
> when clk is not NULL.

It is, but to ensure there is no NULL clk passed at the kref_get(&clk->ref)
line everything got moved under a common "if (clk) { }".

The code will look like this:

-----------
	if (clk) {
		if (!try_module_get(clk->owner))
			return 0;

		kref_get(&clk->ref);
	}
------------

If preferred I could make it:

------------
if (clk && !try_module_get(clk->owner))
	return 0;

if (clk)
	kref_get(&clk->ref);
------------

--
Regards,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-07 13:14     ` Sylwester Nawrocki
  0 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-07 13:14 UTC (permalink / raw)
  To: linux-arm-kernel

Hi,

On 07/01/14 14:00, Lothar Wa?mann wrote:
> Sylwester Nawrocki wrote:
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Thanks,
>> Sylwester
>>
>>  drivers/clk/clk.c |   13 +++++++------
>>  1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
>> index e3e0327..a1fe86f 100644
>> --- a/drivers/clk/clk.c
>> +++ b/drivers/clk/clk.c
>> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>>   */
>>  int __clk_get(struct clk *clk)
>>  {
>> -	if (clk && !try_module_get(clk->owner))
>> -		return 0;
>> +	if (clk) {
>> +		if (!try_module_get(clk->owner))
>> +			return 0;
>>
> This change is unnecessary! The part after the && is only evaluated
> when clk is not NULL.

It is, but to ensure there is no NULL clk passed at the kref_get(&clk->ref)
line everything got moved under a common "if (clk) { }".

The code will look like this:

-----------
	if (clk) {
		if (!try_module_get(clk->owner))
			return 0;

		kref_get(&clk->ref);
	}
------------

If preferred I could make it:

------------
if (clk && !try_module_get(clk->owner))
	return 0;

if (clk)
	kref_get(&clk->ref);
------------

--
Regards,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-07 12:03 ` Sylwester Nawrocki
@ 2014-01-08  4:44   ` Sachin Kamat
  -1 siblings, 0 replies; 20+ messages in thread
From: Sachin Kamat @ 2014-01-08  4:44 UTC (permalink / raw)
  To: Sylwester Nawrocki
  Cc: linux-samsung-soc, linux-arm-kernel, Mike Turquette, Tomasz Figa

Hi Sylwester,

On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
> Ensure clk->kref is dereferenced only when clk is not NULL.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> ---
> Hi Sachin,
>
> please try if this patch fixes the exyno5420 boot crash.

Confirmed that this patch works fine on 5420 as well as already
working 4210 and 5250 boards.
Thanks for the quick fix.

Tested-by: Sachin Kamat <sachin.kamat@linaro.org>


-- 
With warm regards,
Sachin

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-08  4:44   ` Sachin Kamat
  0 siblings, 0 replies; 20+ messages in thread
From: Sachin Kamat @ 2014-01-08  4:44 UTC (permalink / raw)
  To: linux-arm-kernel

Hi Sylwester,

On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
> Ensure clk->kref is dereferenced only when clk is not NULL.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> ---
> Hi Sachin,
>
> please try if this patch fixes the exyno5420 boot crash.

Confirmed that this patch works fine on 5420 as well as already
working 4210 and 5250 boards.
Thanks for the quick fix.

Tested-by: Sachin Kamat <sachin.kamat@linaro.org>


-- 
With warm regards,
Sachin

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-08  4:44   ` Sachin Kamat
@ 2014-01-10 10:04     ` Sylwester Nawrocki
  -1 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-10 10:04 UTC (permalink / raw)
  To: Sachin Kamat
  Cc: linux-samsung-soc, linux-arm-kernel, Mike Turquette, Tomasz Figa

On 08/01/14 05:44, Sachin Kamat wrote:
> Hi Sylwester,
> 
> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
> 
> Confirmed that this patch works fine on 5420 as well as already
> working 4210 and 5250 boards.
> Thanks for the quick fix.
> 
> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>

Thanks Sachin. Mike, it seems we need this patch on top of
my clk-unregister branch. Sorry for overlooking this issue.
Could you add the $subject patch to your clk-next tree ?

Regards,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-10 10:04     ` Sylwester Nawrocki
  0 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-01-10 10:04 UTC (permalink / raw)
  To: linux-arm-kernel

On 08/01/14 05:44, Sachin Kamat wrote:
> Hi Sylwester,
> 
> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
> 
> Confirmed that this patch works fine on 5420 as well as already
> working 4210 and 5250 boards.
> Thanks for the quick fix.
> 
> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>

Thanks Sachin. Mike, it seems we need this patch on top of
my clk-unregister branch. Sorry for overlooking this issue.
Could you add the $subject patch to your clk-next tree ?

Regards,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-10 10:04     ` Sylwester Nawrocki
@ 2014-01-30  4:50       ` Sachin Kamat
  -1 siblings, 0 replies; 20+ messages in thread
From: Sachin Kamat @ 2014-01-30  4:50 UTC (permalink / raw)
  To: Sylwester Nawrocki
  Cc: linux-samsung-soc, linux-arm-kernel, Mike Turquette, Tomasz Figa

On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
> On 08/01/14 05:44, Sachin Kamat wrote:
>> Hi Sylwester,
>>
>> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>
>>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>> ---
>>> Hi Sachin,
>>>
>>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Confirmed that this patch works fine on 5420 as well as already
>> working 4210 and 5250 boards.
>> Thanks for the quick fix.
>>
>> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>
> Thanks Sachin. Mike, it seems we need this patch on top of
> my clk-unregister branch. Sorry for overlooking this issue.
> Could you add the $subject patch to your clk-next tree ?

Gentle ping Mike. Hope we can have this patch in rc-2.

-- 
With warm regards,
Sachin

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-01-30  4:50       ` Sachin Kamat
  0 siblings, 0 replies; 20+ messages in thread
From: Sachin Kamat @ 2014-01-30  4:50 UTC (permalink / raw)
  To: linux-arm-kernel

On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
> On 08/01/14 05:44, Sachin Kamat wrote:
>> Hi Sylwester,
>>
>> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>
>>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>> ---
>>> Hi Sachin,
>>>
>>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Confirmed that this patch works fine on 5420 as well as already
>> working 4210 and 5250 boards.
>> Thanks for the quick fix.
>>
>> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>
> Thanks Sachin. Mike, it seems we need this patch on top of
> my clk-unregister branch. Sorry for overlooking this issue.
> Could you add the $subject patch to your clk-next tree ?

Gentle ping Mike. Hope we can have this patch in rc-2.

-- 
With warm regards,
Sachin

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-30  4:50       ` Sachin Kamat
@ 2014-02-10 15:02         ` Sylwester Nawrocki
  -1 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-02-10 15:02 UTC (permalink / raw)
  To: Mike Turquette
  Cc: Sachin Kamat, linux-samsung-soc, linux-arm-kernel, Tomasz Figa

On 30/01/14 05:50, Sachin Kamat wrote:
> On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>> > On 08/01/14 05:44, Sachin Kamat wrote:
>>> >> Hi Sylwester,
>>> >>
>>> >> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>> >>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>> >>>
>>>> >>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>>> >>> ---
>>>> >>> Hi Sachin,
>>>> >>>
>>>> >>> please try if this patch fixes the exyno5420 boot crash.
>>> >>
>>> >> Confirmed that this patch works fine on 5420 as well as already
>>> >> working 4210 and 5250 boards.
>>> >> Thanks for the quick fix.
>>> >>
>>> >> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>> >
>> > Thanks Sachin. Mike, it seems we need this patch on top of
>> > my clk-unregister branch. Sorry for overlooking this issue.
>> > Could you add the $subject patch to your clk-next tree ?
>
> Gentle ping Mike. Hope we can have this patch in rc-2.

A gentle reminder, this patch is still not in current -rc and is required
to fix booting of some exynos platforms.

Thanks,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-02-10 15:02         ` Sylwester Nawrocki
  0 siblings, 0 replies; 20+ messages in thread
From: Sylwester Nawrocki @ 2014-02-10 15:02 UTC (permalink / raw)
  To: linux-arm-kernel

On 30/01/14 05:50, Sachin Kamat wrote:
> On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>> > On 08/01/14 05:44, Sachin Kamat wrote:
>>> >> Hi Sylwester,
>>> >>
>>> >> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>> >>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>> >>>
>>>> >>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>>> >>> ---
>>>> >>> Hi Sachin,
>>>> >>>
>>>> >>> please try if this patch fixes the exyno5420 boot crash.
>>> >>
>>> >> Confirmed that this patch works fine on 5420 as well as already
>>> >> working 4210 and 5250 boards.
>>> >> Thanks for the quick fix.
>>> >>
>>> >> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>> >
>> > Thanks Sachin. Mike, it seems we need this patch on top of
>> > my clk-unregister branch. Sorry for overlooking this issue.
>> > Could you add the $subject patch to your clk-next tree ?
>
> Gentle ping Mike. Hope we can have this patch in rc-2.

A gentle reminder, this patch is still not in current -rc and is required
to fix booting of some exynos platforms.

Thanks,
Sylwester

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-02-10 15:02         ` Sylwester Nawrocki
@ 2014-02-24 12:59           ` Tomasz Figa
  -1 siblings, 0 replies; 20+ messages in thread
From: Tomasz Figa @ 2014-02-24 12:59 UTC (permalink / raw)
  To: Sylwester Nawrocki, Mike Turquette
  Cc: Sachin Kamat, linux-samsung-soc, linux-arm-kernel, Tomasz Figa

Mike,

On 10.02.2014 16:02, Sylwester Nawrocki wrote:
> On 30/01/14 05:50, Sachin Kamat wrote:
>> On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>> On 08/01/14 05:44, Sachin Kamat wrote:
>>>>>> Hi Sylwester,
>>>>>>
>>>>>> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>>>>>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>>>>>>
>>>>>>>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>>>>>>> ---
>>>>>>>> Hi Sachin,
>>>>>>>>
>>>>>>>> please try if this patch fixes the exyno5420 boot crash.
>>>>>>
>>>>>> Confirmed that this patch works fine on 5420 as well as already
>>>>>> working 4210 and 5250 boards.
>>>>>> Thanks for the quick fix.
>>>>>>
>>>>>> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>>>>
>>>> Thanks Sachin. Mike, it seems we need this patch on top of
>>>> my clk-unregister branch. Sorry for overlooking this issue.
>>>> Could you add the $subject patch to your clk-next tree ?
>>
>> Gentle ping Mike. Hope we can have this patch in rc-2.
>
> A gentle reminder, this patch is still not in current -rc and is required
> to fix booting of some exynos platforms.

It's been one and a half of a month since Sylwester posted this patch. 
Sorry for nagging, but for this whole period we've been observing 
complete breakage of several platforms, including Exynos4412-Trats2 
board, due to NULL pointer dereference at boot-up time, so I'd consider 
this patch a _critical_ fix.

Can we expect this patch to be applied to your tree and sent for next rc 
release or I should apply it to my tree and send a pull request to Linus 
directly?

Best regards,
Tomasz

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-02-24 12:59           ` Tomasz Figa
  0 siblings, 0 replies; 20+ messages in thread
From: Tomasz Figa @ 2014-02-24 12:59 UTC (permalink / raw)
  To: linux-arm-kernel

Mike,

On 10.02.2014 16:02, Sylwester Nawrocki wrote:
> On 30/01/14 05:50, Sachin Kamat wrote:
>> On 10 January 2014 15:34, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>> On 08/01/14 05:44, Sachin Kamat wrote:
>>>>>> Hi Sylwester,
>>>>>>
>>>>>> On 7 January 2014 17:33, Sylwester Nawrocki <s.nawrocki@samsung.com> wrote:
>>>>>>>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>>>>>>>
>>>>>>>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>>>>>>> ---
>>>>>>>> Hi Sachin,
>>>>>>>>
>>>>>>>> please try if this patch fixes the exyno5420 boot crash.
>>>>>>
>>>>>> Confirmed that this patch works fine on 5420 as well as already
>>>>>> working 4210 and 5250 boards.
>>>>>> Thanks for the quick fix.
>>>>>>
>>>>>> Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
>>>>
>>>> Thanks Sachin. Mike, it seems we need this patch on top of
>>>> my clk-unregister branch. Sorry for overlooking this issue.
>>>> Could you add the $subject patch to your clk-next tree ?
>>
>> Gentle ping Mike. Hope we can have this patch in rc-2.
>
> A gentle reminder, this patch is still not in current -rc and is required
> to fix booting of some exynos platforms.

It's been one and a half of a month since Sylwester posted this patch. 
Sorry for nagging, but for this whole period we've been observing 
complete breakage of several platforms, including Exynos4412-Trats2 
board, due to NULL pointer dereference at boot-up time, so I'd consider 
this patch a _critical_ fix.

Can we expect this patch to be applied to your tree and sent for next rc 
release or I should apply it to my tree and send a pull request to Linus 
directly?

Best regards,
Tomasz

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-01-07 12:03 ` Sylwester Nawrocki
@ 2014-02-25  6:16   ` Mike Turquette
  -1 siblings, 0 replies; 20+ messages in thread
From: Mike Turquette @ 2014-02-25  6:16 UTC (permalink / raw)
  To: sachin.kamat
  Cc: linux-samsung-soc, linux-arm-kernel, tomasz.figa, Sylwester Nawrocki

Quoting Sylwester Nawrocki (2014-01-07 04:03:43)
> Ensure clk->kref is dereferenced only when clk is not NULL.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Taken into clk-fixes toward -rc5.

Thanks!
Mike

> ---
> Hi Sachin,
> 
> please try if this patch fixes the exyno5420 boot crash.
> 
> Thanks,
> Sylwester
> 
>  drivers/clk/clk.c |   13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index e3e0327..a1fe86f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>   */
>  int __clk_get(struct clk *clk)
>  {
> -       if (clk && !try_module_get(clk->owner))
> -               return 0;
> +       if (clk) {
> +               if (!try_module_get(clk->owner))
> +                       return 0;
> 
> -       kref_get(&clk->ref);
> +               kref_get(&clk->ref);
> +       }
>         return 1;
>  }
> 
>  void __clk_put(struct clk *clk)
>  {
> -       if (WARN_ON_ONCE(IS_ERR(clk)))
> +       if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
>                 return;
> 
>         clk_prepare_lock();
>         kref_put(&clk->ref, __clk_release);
>         clk_prepare_unlock();
> 
> -       if (clk)
> -               module_put(clk->owner);
> +       module_put(clk->owner);
>  }
> 
>  /***        clk rate change notifiers        ***/
> --
> 1.7.9.5
> 

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-02-25  6:16   ` Mike Turquette
  0 siblings, 0 replies; 20+ messages in thread
From: Mike Turquette @ 2014-02-25  6:16 UTC (permalink / raw)
  To: linux-arm-kernel

Quoting Sylwester Nawrocki (2014-01-07 04:03:43)
> Ensure clk->kref is dereferenced only when clk is not NULL.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Taken into clk-fixes toward -rc5.

Thanks!
Mike

> ---
> Hi Sachin,
> 
> please try if this patch fixes the exyno5420 boot crash.
> 
> Thanks,
> Sylwester
> 
>  drivers/clk/clk.c |   13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index e3e0327..a1fe86f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>   */
>  int __clk_get(struct clk *clk)
>  {
> -       if (clk && !try_module_get(clk->owner))
> -               return 0;
> +       if (clk) {
> +               if (!try_module_get(clk->owner))
> +                       return 0;
> 
> -       kref_get(&clk->ref);
> +               kref_get(&clk->ref);
> +       }
>         return 1;
>  }
> 
>  void __clk_put(struct clk *clk)
>  {
> -       if (WARN_ON_ONCE(IS_ERR(clk)))
> +       if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
>                 return;
> 
>         clk_prepare_lock();
>         kref_put(&clk->ref, __clk_release);
>         clk_prepare_unlock();
> 
> -       if (clk)
> -               module_put(clk->owner);
> +       module_put(clk->owner);
>  }
> 
>  /***        clk rate change notifiers        ***/
> --
> 1.7.9.5
> 

^ permalink raw reply	[flat|nested] 20+ messages in thread
* Re: [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
  2014-02-25  6:16   ` Mike Turquette
@ 2014-02-25 17:34     ` Tomasz Figa
  -1 siblings, 0 replies; 20+ messages in thread
From: Tomasz Figa @ 2014-02-25 17:34 UTC (permalink / raw)
  To: Mike Turquette, Sylwester Nawrocki, sachin.kamat
  Cc: linux-samsung-soc, linux-arm-kernel

Hi Mike,

On 25.02.2014 07:16, Mike Turquette wrote:
> Quoting Sylwester Nawrocki (2014-01-07 04:03:43)
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>
> Taken into clk-fixes toward -rc5.

Thanks! \o/

Best regards,
Tomasz

>
> Thanks!
> Mike
>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Thanks,
>> Sylwester
>>
>>   drivers/clk/clk.c |   13 +++++++------
>>   1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
>> index e3e0327..a1fe86f 100644
>> --- a/drivers/clk/clk.c
>> +++ b/drivers/clk/clk.c
>> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>>    */
>>   int __clk_get(struct clk *clk)
>>   {
>> -       if (clk && !try_module_get(clk->owner))
>> -               return 0;
>> +       if (clk) {
>> +               if (!try_module_get(clk->owner))
>> +                       return 0;
>>
>> -       kref_get(&clk->ref);
>> +               kref_get(&clk->ref);
>> +       }
>>          return 1;
>>   }
>>
>>   void __clk_put(struct clk *clk)
>>   {
>> -       if (WARN_ON_ONCE(IS_ERR(clk)))
>> +       if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
>>                  return;
>>
>>          clk_prepare_lock();
>>          kref_put(&clk->ref, __clk_release);
>>          clk_prepare_unlock();
>>
>> -       if (clk)
>> -               module_put(clk->owner);
>> +       module_put(clk->owner);
>>   }
>>
>>   /***        clk rate change notifiers        ***/
>> --
>> 1.7.9.5
>>

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [PATCH] clk: Correct handling of NULL clk in __clk_{get, put}
@ 2014-02-25 17:34     ` Tomasz Figa
  0 siblings, 0 replies; 20+ messages in thread
From: Tomasz Figa @ 2014-02-25 17:34 UTC (permalink / raw)
  To: linux-arm-kernel

Hi Mike,

On 25.02.2014 07:16, Mike Turquette wrote:
> Quoting Sylwester Nawrocki (2014-01-07 04:03:43)
>> Ensure clk->kref is dereferenced only when clk is not NULL.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>
> Taken into clk-fixes toward -rc5.

Thanks! \o/

Best regards,
Tomasz

>
> Thanks!
> Mike
>
>> ---
>> Hi Sachin,
>>
>> please try if this patch fixes the exyno5420 boot crash.
>>
>> Thanks,
>> Sylwester
>>
>>   drivers/clk/clk.c |   13 +++++++------
>>   1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
>> index e3e0327..a1fe86f 100644
>> --- a/drivers/clk/clk.c
>> +++ b/drivers/clk/clk.c
>> @@ -2179,24 +2179,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
>>    */
>>   int __clk_get(struct clk *clk)
>>   {
>> -       if (clk && !try_module_get(clk->owner))
>> -               return 0;
>> +       if (clk) {
>> +               if (!try_module_get(clk->owner))
>> +                       return 0;
>>
>> -       kref_get(&clk->ref);
>> +               kref_get(&clk->ref);
>> +       }
>>          return 1;
>>   }
>>
>>   void __clk_put(struct clk *clk)
>>   {
>> -       if (WARN_ON_ONCE(IS_ERR(clk)))
>> +       if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
>>                  return;
>>
>>          clk_prepare_lock();
>>          kref_put(&clk->ref, __clk_release);
>>          clk_prepare_unlock();
>>
>> -       if (clk)
>> -               module_put(clk->owner);
>> +       module_put(clk->owner);
>>   }
>>
>>   /***        clk rate change notifiers        ***/
>> --
>> 1.7.9.5
>>

^ permalink raw reply	[flat|nested] 20+ messages in thread
end of thread, other threads:[~2014-02-25 17:34 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-01-07 12:03 [PATCH] clk: Correct handling of NULL clk in __clk_{get, put} Sylwester Nawrocki
2014-01-07 12:03 ` Sylwester Nawrocki
2014-01-07 13:00 ` Lothar Waßmann
2014-01-07 13:00   ` Lothar Waßmann
2014-01-07 13:14   ` Sylwester Nawrocki
2014-01-07 13:14     ` Sylwester Nawrocki
2014-01-08  4:44 ` Sachin Kamat
2014-01-08  4:44   ` Sachin Kamat
2014-01-10 10:04   ` Sylwester Nawrocki
2014-01-10 10:04     ` Sylwester Nawrocki
2014-01-30  4:50     ` Sachin Kamat
2014-01-30  4:50       ` Sachin Kamat
2014-02-10 15:02       ` Sylwester Nawrocki
2014-02-10 15:02         ` Sylwester Nawrocki
2014-02-24 12:59         ` Tomasz Figa
2014-02-24 12:59           ` Tomasz Figa
2014-02-25  6:16 ` Mike Turquette
2014-02-25  6:16   ` Mike Turquette
2014-02-25 17:34   ` Tomasz Figa
2014-02-25 17:34     ` Tomasz Figa

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