[v2] remoteproc: stm32: fix probe error case
diff mbox series

Message ID 1570433991-16353-1-git-send-email-fabien.dessenne@st.com
State Superseded
Headers show
Series
  • [v2] remoteproc: stm32: fix probe error case
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Commit Message

Fabien DESSENNE Oct. 7, 2019, 7:39 a.m. UTC
If the rproc driver is probed before the mailbox driver and if the rproc
Device Tree node has some mailbox properties, the rproc driver probe
shall be deferred instead of being probed without mailbox support.

Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
---
Changes since v1: test IS_ERR() before checking PTR_ERR()
---
 drivers/remoteproc/stm32_rproc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Comments

Bjorn Andersson Nov. 11, 2019, 10:04 p.m. UTC | #1
On Mon 07 Oct 00:39 PDT 2019, Fabien Dessenne wrote:

> If the rproc driver is probed before the mailbox driver and if the rproc
> Device Tree node has some mailbox properties, the rproc driver probe
> shall be deferred instead of being probed without mailbox support.
> 
> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
> Changes since v1: test IS_ERR() before checking PTR_ERR()
> ---
>  drivers/remoteproc/stm32_rproc.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index 2cf4b29..a507332 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -310,7 +310,7 @@ static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
>  	}
>  };
>  
> -static void stm32_rproc_request_mbox(struct rproc *rproc)
> +static int stm32_rproc_request_mbox(struct rproc *rproc)
>  {
>  	struct stm32_rproc *ddata = rproc->priv;
>  	struct device *dev = &rproc->dev;
> @@ -329,10 +329,14 @@ static void stm32_rproc_request_mbox(struct rproc *rproc)
>  
>  		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
>  		if (IS_ERR(ddata->mb[i].chan)) {
> +			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
> +				return -EPROBE_DEFER;

If for some reason you get EPROBE_DEFER when i > 0 you need to
mbox_free_channel() channels [0..i) before returning.

Regards,
Bjorn

>  			dev_warn(dev, "cannot get %s mbox\n", name);
>  			ddata->mb[i].chan = NULL;
>  		}
>  	}
> +
> +	return 0;
>  }
>  
>  static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
> @@ -596,7 +600,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto free_rproc;
>  
> -	stm32_rproc_request_mbox(rproc);
> +	ret = stm32_rproc_request_mbox(rproc);
> +	if (ret)
> +		goto free_rproc;
>  
>  	ret = rproc_add(rproc);
>  	if (ret)
> -- 
> 2.7.4
>
Fabien DESSENNE Nov. 12, 2019, 2:09 p.m. UTC | #2
Hi Bjorn,


On 11/11/2019 11:04 PM, Bjorn Andersson wrote:
> On Mon 07 Oct 00:39 PDT 2019, Fabien Dessenne wrote:
>
>> If the rproc driver is probed before the mailbox driver and if the rproc
>> Device Tree node has some mailbox properties, the rproc driver probe
>> shall be deferred instead of being probed without mailbox support.
>>
>> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
>> ---
>> Changes since v1: test IS_ERR() before checking PTR_ERR()
>> ---
>>   drivers/remoteproc/stm32_rproc.c | 10 ++++++++--
>>   1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
>> index 2cf4b29..a507332 100644
>> --- a/drivers/remoteproc/stm32_rproc.c
>> +++ b/drivers/remoteproc/stm32_rproc.c
>> @@ -310,7 +310,7 @@ static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
>>   	}
>>   };
>>   
>> -static void stm32_rproc_request_mbox(struct rproc *rproc)
>> +static int stm32_rproc_request_mbox(struct rproc *rproc)
>>   {
>>   	struct stm32_rproc *ddata = rproc->priv;
>>   	struct device *dev = &rproc->dev;
>> @@ -329,10 +329,14 @@ static void stm32_rproc_request_mbox(struct rproc *rproc)
>>   
>>   		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
>>   		if (IS_ERR(ddata->mb[i].chan)) {
>> +			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
>> +				return -EPROBE_DEFER;
> If for some reason you get EPROBE_DEFER when i > 0 you need to
> mbox_free_channel() channels [0..i) before returning.

The mailbox framework returns EPROBE_DIFFER to inform that the mailbox 
provider has not registered yet. I do not expected to have a success 
followed by a EPROBE_DEFER error.

But in the very special case where we use two different mailbox 
providers this may happen.

I will send an updated version, thanks for pointing this.

BR

Fabien

>
> Regards,
> Bjorn
>
>>   			dev_warn(dev, "cannot get %s mbox\n", name);
>>   			ddata->mb[i].chan = NULL;
>>   		}
>>   	}
>> +
>> +	return 0;
>>   }
>>   
>>   static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
>> @@ -596,7 +600,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>>   	if (ret)
>>   		goto free_rproc;
>>   
>> -	stm32_rproc_request_mbox(rproc);
>> +	ret = stm32_rproc_request_mbox(rproc);
>> +	if (ret)
>> +		goto free_rproc;
>>   
>>   	ret = rproc_add(rproc);
>>   	if (ret)
>> -- 
>> 2.7.4
>>
Bjorn Andersson Nov. 12, 2019, 6:22 p.m. UTC | #3
On Tue 12 Nov 06:09 PST 2019, Fabien DESSENNE wrote:

> Hi Bjorn,
> 
> 
> On 11/11/2019 11:04 PM, Bjorn Andersson wrote:
> > On Mon 07 Oct 00:39 PDT 2019, Fabien Dessenne wrote:
> >
> >> If the rproc driver is probed before the mailbox driver and if the rproc
> >> Device Tree node has some mailbox properties, the rproc driver probe
> >> shall be deferred instead of being probed without mailbox support.
> >>
> >> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
> >> ---
> >> Changes since v1: test IS_ERR() before checking PTR_ERR()
> >> ---
> >>   drivers/remoteproc/stm32_rproc.c | 10 ++++++++--
> >>   1 file changed, 8 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> >> index 2cf4b29..a507332 100644
> >> --- a/drivers/remoteproc/stm32_rproc.c
> >> +++ b/drivers/remoteproc/stm32_rproc.c
> >> @@ -310,7 +310,7 @@ static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
> >>   	}
> >>   };
> >>   
> >> -static void stm32_rproc_request_mbox(struct rproc *rproc)
> >> +static int stm32_rproc_request_mbox(struct rproc *rproc)
> >>   {
> >>   	struct stm32_rproc *ddata = rproc->priv;
> >>   	struct device *dev = &rproc->dev;
> >> @@ -329,10 +329,14 @@ static void stm32_rproc_request_mbox(struct rproc *rproc)
> >>   
> >>   		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
> >>   		if (IS_ERR(ddata->mb[i].chan)) {
> >> +			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
> >> +				return -EPROBE_DEFER;
> > If for some reason you get EPROBE_DEFER when i > 0 you need to
> > mbox_free_channel() channels [0..i) before returning.
> 
> The mailbox framework returns EPROBE_DIFFER to inform that the mailbox 
> provider has not registered yet. I do not expected to have a success 
> followed by a EPROBE_DEFER error.
> 
> But in the very special case where we use two different mailbox 
> providers this may happen.
> 

I agree, it's unlikely to ever cause any problems...

> I will send an updated version, thanks for pointing this.
> 

I appreciate that.

Thanks,
Bjorn

> BR
> 
> Fabien
> 
> >
> > Regards,
> > Bjorn
> >
> >>   			dev_warn(dev, "cannot get %s mbox\n", name);
> >>   			ddata->mb[i].chan = NULL;
> >>   		}
> >>   	}
> >> +
> >> +	return 0;
> >>   }
> >>   
> >>   static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
> >> @@ -596,7 +600,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
> >>   	if (ret)
> >>   		goto free_rproc;
> >>   
> >> -	stm32_rproc_request_mbox(rproc);
> >> +	ret = stm32_rproc_request_mbox(rproc);
> >> +	if (ret)
> >> +		goto free_rproc;
> >>   
> >>   	ret = rproc_add(rproc);
> >>   	if (ret)
> >> -- 
> >> 2.7.4
> >>

Patch
diff mbox series

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 2cf4b29..a507332 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -310,7 +310,7 @@  static const struct stm32_mbox stm32_rproc_mbox[MBOX_NB_MBX] = {
 	}
 };
 
-static void stm32_rproc_request_mbox(struct rproc *rproc)
+static int stm32_rproc_request_mbox(struct rproc *rproc)
 {
 	struct stm32_rproc *ddata = rproc->priv;
 	struct device *dev = &rproc->dev;
@@ -329,10 +329,14 @@  static void stm32_rproc_request_mbox(struct rproc *rproc)
 
 		ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
 		if (IS_ERR(ddata->mb[i].chan)) {
+			if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
 			dev_warn(dev, "cannot get %s mbox\n", name);
 			ddata->mb[i].chan = NULL;
 		}
 	}
+
+	return 0;
 }
 
 static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
@@ -596,7 +600,9 @@  static int stm32_rproc_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_rproc;
 
-	stm32_rproc_request_mbox(rproc);
+	ret = stm32_rproc_request_mbox(rproc);
+	if (ret)
+		goto free_rproc;
 
 	ret = rproc_add(rproc);
 	if (ret)