[PATCH] wcn36xx: Fix error handling path in 'wcn36xx_probe()'

[PATCH] wcn36xx: Fix error handling path in 'wcn36xx_probe()'

[Christophe JAILLET]

In case of error, 'qcom_wcnss_open_channel()' must be undone by a call to
'rpmsg_destroy_ept()', as already done in the remove function.

Fixes: 5052de8deff5 ("soc: qcom: smd: Transition client drivers from smd to rpmsg")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Not 100% sure of the commit for Fixes, but it is consistent with the
analysis in efad8396e906 where the same call has been added in the remove
function.
---
 drivers/net/wireless/ath/wcn36xx/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index e49c306e0eef..1acdc13a74fc 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -1339,7 +1339,7 @@ static int wcn36xx_probe(struct platform_device *pdev)
 	if (addr && ret != ETH_ALEN) {
 		wcn36xx_err("invalid local-mac-address\n");
 		ret = -EINVAL;
-		goto out_wq;
+		goto out_channel;
 	} else if (addr) {
 		wcn36xx_info("mac address: %pM\n", addr);
 		SET_IEEE80211_PERM_ADDR(wcn->hw, addr);
@@ -1347,7 +1347,7 @@ static int wcn36xx_probe(struct platform_device *pdev)
 
 	ret = wcn36xx_platform_get_resources(wcn, pdev);
 	if (ret)
-		goto out_wq;
+		goto out_channel;
 
 	wcn36xx_init_ieee80211(wcn);
 	ret = ieee80211_register_hw(wcn->hw);
@@ -1359,6 +1359,8 @@ static int wcn36xx_probe(struct platform_device *pdev)
 out_unmap:
 	iounmap(wcn->ccu_base);
 	iounmap(wcn->dxe_base);
+out_channel:
+	rpmsg_destroy_ept(wcn->smd_channel);
 out_wq:
 	ieee80211_free_hw(hw);
 out_err:
-- 
2.25.1

Re: [PATCH] wcn36xx: Fix error handling path in 'wcn36xx_probe()'

[Bjorn Andersson]

On Wed 06 May 21:36 PDT 2020, Christophe JAILLET wrote:

> In case of error, 'qcom_wcnss_open_channel()' must be undone by a call to
> 'rpmsg_destroy_ept()', as already done in the remove function.
> 
> Fixes: 5052de8deff5 ("soc: qcom: smd: Transition client drivers from smd to rpmsg")

It seems I introduced this bug in f303a9311065 ("wcn36xx: Transition
driver to SMD client"), but your patch should should apply back to your
Fixes, so I think it's good.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> Not 100% sure of the commit for Fixes, but it is consistent with the
> analysis in efad8396e906 where the same call has been added in the remove
> function.
> ---
>  drivers/net/wireless/ath/wcn36xx/main.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index e49c306e0eef..1acdc13a74fc 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -1339,7 +1339,7 @@ static int wcn36xx_probe(struct platform_device *pdev)
>  	if (addr && ret != ETH_ALEN) {
>  		wcn36xx_err("invalid local-mac-address\n");
>  		ret = -EINVAL;
> -		goto out_wq;
> +		goto out_channel;
>  	} else if (addr) {
>  		wcn36xx_info("mac address: %pM\n", addr);
>  		SET_IEEE80211_PERM_ADDR(wcn->hw, addr);
> @@ -1347,7 +1347,7 @@ static int wcn36xx_probe(struct platform_device *pdev)
>  
>  	ret = wcn36xx_platform_get_resources(wcn, pdev);
>  	if (ret)
> -		goto out_wq;
> +		goto out_channel;
>  
>  	wcn36xx_init_ieee80211(wcn);
>  	ret = ieee80211_register_hw(wcn->hw);
> @@ -1359,6 +1359,8 @@ static int wcn36xx_probe(struct platform_device *pdev)
>  out_unmap:
>  	iounmap(wcn->ccu_base);
>  	iounmap(wcn->dxe_base);
> +out_channel:
> +	rpmsg_destroy_ept(wcn->smd_channel);
>  out_wq:
>  	ieee80211_free_hw(hw);
>  out_err:
> -- 
> 2.25.1
> 

Re: [PATCH] wcn36xx: Fix error handling path in 'wcn36xx_probe()'

[Kalle Valo]

Christophe JAILLET <christophe.jaillet@wanadoo.fr> wrote:

> In case of error, 'qcom_wcnss_open_channel()' must be undone by a call to
> 'rpmsg_destroy_ept()', as already done in the remove function.
> 
> Fixes: 5052de8deff5 ("soc: qcom: smd: Transition client drivers from smd to rpmsg")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

a86308fc534e wcn36xx: Fix error handling path in 'wcn36xx_probe()'

-- 
https://patchwork.kernel.org/patch/11532419/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH] wcn36xx: Fix error handling path in wcn36xx_probe()

[Kalle Valo]

Markus Elfring <Markus.Elfring@web.de> writes:

> …
>> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> …
>> @@ -1359,6 +1359,8 @@ static int wcn36xx_probe(struct platform_device *pdev)
>>  out_unmap:
>>  	iounmap(wcn->ccu_base);
>>  	iounmap(wcn->dxe_base);
>> +out_channel:
>> +	rpmsg_destroy_ept(wcn->smd_channel);
>>  out_wq:
>>  	ieee80211_free_hw(hw);
>>  out_err:
>
> How do you think about to use the label “out_destroy_ept”?

Yeah, that's better. I'll change it in the pending branch before I
commit.

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH] wcn36xx: Fix error handling path in wcn36xx_probe()

[Markus Elfring]

…
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
…
> @@ -1359,6 +1359,8 @@ static int wcn36xx_probe(struct platform_device *pdev)
>  out_unmap:
>  	iounmap(wcn->ccu_base);
>  	iounmap(wcn->dxe_base);
> +out_channel:
> +	rpmsg_destroy_ept(wcn->smd_channel);
>  out_wq:
>  	ieee80211_free_hw(hw);
>  out_err:

How do you think about to use the label “out_destroy_ept”?

Regards,
Markus