Function of_phandle_iterator_next() calls of_node_put() on the last
device_node it iterated over, but when the loop exits prematurely it has
to be called explicitly.

Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver")
Cc: stable@vger.kernel.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/remoteproc/stm32_rproc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 7d782ed9e589..23c1690b8d73 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -223,11 +223,13 @@ static int stm32_rproc_prepare(struct rproc *rproc)
 	while (of_phandle_iterator_next(&it) == 0) {
 		rmem = of_reserved_mem_lookup(it.node);
 		if (!rmem) {
+			of_node_put(it.node);
 			dev_err(dev, "unable to acquire memory-region\n");
 			return -EINVAL;
 		}
 
 		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
+			of_node_put(it.node);
 			dev_err(dev, "memory region not valid %pa\n",
 				&rmem->base);
 			return -EINVAL;
@@ -254,8 +256,10 @@ static int stm32_rproc_prepare(struct rproc *rproc)
 							   it.node->name);
 		}
 
-		if (!mem)
+		if (!mem) {
+			of_node_put(it.node);
 			return -ENOMEM;
+		}
 
 		rproc_add_carveout(rproc, mem);
 		index++;
-- 
2.25.1

Hi Mathieu,

On 3/20/23 23:18, Mathieu Poirier wrote:
> Function of_phandle_iterator_next() calls of_node_put() on the last
> device_node it iterated over, but when the loop exits prematurely it has
> to be called explicitly> 
> Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver")
> Cc: stable@vger.kernel.org
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> ---
>  drivers/remoteproc/stm32_rproc.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index 7d782ed9e589..23c1690b8d73 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -223,11 +223,13 @@ static int stm32_rproc_prepare(struct rproc *rproc)
>  	while (of_phandle_iterator_next(&it) == 0) {
>  		rmem = of_reserved_mem_lookup(it.node);
>  		if (!rmem) {
> +			of_node_put(it.node);
>  			dev_err(dev, "unable to acquire memory-region\n");
>  			return -EINVAL;
>  		}
>  
>  		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
> +			of_node_put(it.node);
>  			dev_err(dev, "memory region not valid %pa\n",
>  				&rmem->base);
>  			return -EINVAL;
> @@ -254,8 +256,10 @@ static int stm32_rproc_prepare(struct rproc *rproc)
>  							   it.node->name);
>  		}
>  
> -		if (!mem)
> +		if (!mem) {
> +			of_node_put(it.node);
>  			return -ENOMEM;
> +		}

Good catch!

Looking in code I don't see that we call of_node_put() when we release the
carveouts. 
Please tell me if I'm wrong but look to me that we should also call of_node_put()
in mem->release() op, in drivers. 

This one remains valid.
reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

Thanks,
Arnaud


>  
>  		rproc_add_carveout(rproc, mem);
>  		index++;

On Tue, Mar 21, 2023 at 10:00:03AM +0100, Arnaud POULIQUEN wrote:
> Hi Mathieu,
> 
> On 3/20/23 23:18, Mathieu Poirier wrote:
> > Function of_phandle_iterator_next() calls of_node_put() on the last
> > device_node it iterated over, but when the loop exits prematurely it has
> > to be called explicitly> 
> > Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> > ---
> >  drivers/remoteproc/stm32_rproc.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> > index 7d782ed9e589..23c1690b8d73 100644
> > --- a/drivers/remoteproc/stm32_rproc.c
> > +++ b/drivers/remoteproc/stm32_rproc.c
> > @@ -223,11 +223,13 @@ static int stm32_rproc_prepare(struct rproc *rproc)
> >  	while (of_phandle_iterator_next(&it) == 0) {
> >  		rmem = of_reserved_mem_lookup(it.node);
> >  		if (!rmem) {
> > +			of_node_put(it.node);
> >  			dev_err(dev, "unable to acquire memory-region\n");
> >  			return -EINVAL;
> >  		}
> >  
> >  		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
> > +			of_node_put(it.node);
> >  			dev_err(dev, "memory region not valid %pa\n",
> >  				&rmem->base);
> >  			return -EINVAL;
> > @@ -254,8 +256,10 @@ static int stm32_rproc_prepare(struct rproc *rproc)
> >  							   it.node->name);
> >  		}
> >  
> > -		if (!mem)
> > +		if (!mem) {
> > +			of_node_put(it.node);
> >  			return -ENOMEM;
> > +		}
> 
> Good catch!
> 
> Looking in code I don't see that we call of_node_put() when we release the
> carveouts. 
> Please tell me if I'm wrong but look to me that we should also call of_node_put()
> in mem->release() op, in drivers. 
>

Are you referring to entry->release(), which for stm32 is
stm32_rproc_mem_release(), in rproc_resource_cleanup()?

If so then no, it is not needed since of_phandle_iterator_next() calls
of_node_put() on the previous device_node with each iteration.

Otherwise I fail to understand the question and will ask you to clarify.

> This one remains valid.
> reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
> 

Ok

> Thanks,
> Arnaud
> 
> 
> >  
> >  		rproc_add_carveout(rproc, mem);
> >  		index++;

On 3/21/23 22:32, Mathieu Poirier wrote:
> On Tue, Mar 21, 2023 at 10:00:03AM +0100, Arnaud POULIQUEN wrote:
>> Hi Mathieu,
>>
>> On 3/20/23 23:18, Mathieu Poirier wrote:
>>> Function of_phandle_iterator_next() calls of_node_put() on the last
>>> device_node it iterated over, but when the loop exits prematurely it has
>>> to be called explicitly> 
>>> Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver")
>>> Cc: stable@vger.kernel.org
>>> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
>>> ---
>>>  drivers/remoteproc/stm32_rproc.c | 6 +++++-
>>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
>>> index 7d782ed9e589..23c1690b8d73 100644
>>> --- a/drivers/remoteproc/stm32_rproc.c
>>> +++ b/drivers/remoteproc/stm32_rproc.c
>>> @@ -223,11 +223,13 @@ static int stm32_rproc_prepare(struct rproc *rproc)
>>>  	while (of_phandle_iterator_next(&it) == 0) {
>>>  		rmem = of_reserved_mem_lookup(it.node);
>>>  		if (!rmem) {
>>> +			of_node_put(it.node);
>>>  			dev_err(dev, "unable to acquire memory-region\n");
>>>  			return -EINVAL;
>>>  		}
>>>  
>>>  		if (stm32_rproc_pa_to_da(rproc, rmem->base, &da) < 0) {
>>> +			of_node_put(it.node);
>>>  			dev_err(dev, "memory region not valid %pa\n",
>>>  				&rmem->base);
>>>  			return -EINVAL;
>>> @@ -254,8 +256,10 @@ static int stm32_rproc_prepare(struct rproc *rproc)
>>>  							   it.node->name);
>>>  		}
>>>  
>>> -		if (!mem)
>>> +		if (!mem) {
>>> +			of_node_put(it.node);
>>>  			return -ENOMEM;
>>> +		}
>>
>> Good catch!
>>
>> Looking in code I don't see that we call of_node_put() when we release the
>> carveouts. 
>> Please tell me if I'm wrong but look to me that we should also call of_node_put()
>> in mem->release() op, in drivers. 
>>
> 
> Are you referring to entry->release(), which for stm32 is
> stm32_rproc_mem_release(), in rproc_resource_cleanup()?
> 
> If so then no, it is not needed since of_phandle_iterator_next() calls
> of_node_put() on the previous device_node with each iteration.
> 
> Otherwise I fail to understand the question and will ask you to clarify.

My apologize, I misread the of_phandle_iterator_next function. you can forget my
comment.

Regards,
Arnaud

> 
>> This one remains valid.
>> reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
>>
> 
> Ok
> 
>> Thanks,
>> Arnaud
>>
>>
>>>  
>>>  		rproc_add_carveout(rproc, mem);
>>>  		index++;