[PATCH] most: core: Drop device reference after usage in get_channel()

[PATCH] most: core: Drop device reference after usage in get_channel()

[Miaoqian Lin]

In get_channel(), the reference obtained by bus_find_device_by_name()
was dropped via put_device() before accessing the device's driver data
Move put_device() after usage to avoid potential issues.

Fixes: 2485055394be ("staging: most: core: drop device reference")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/most/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/most/core.c b/drivers/most/core.c
index a635d5082ebb..da319d108ea1 100644
--- a/drivers/most/core.c
+++ b/drivers/most/core.c
@@ -538,8 +538,8 @@ static struct most_channel *get_channel(char *mdev, char *mdev_ch)
 	dev = bus_find_device_by_name(&mostbus, NULL, mdev);
 	if (!dev)
 		return NULL;
-	put_device(dev);
 	iface = dev_get_drvdata(dev);
+	put_device(dev);
 	list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
 		if (!strcmp(dev_name(&c->dev), mdev_ch))
 			return c;
-- 
2.25.1

Re: [PATCH] most: core: Drop device reference after usage in get_channel()

[Greg Kroah-Hartman]

On Mon, Aug 04, 2025 at 12:29:55PM +0400, Miaoqian Lin wrote:
> In get_channel(), the reference obtained by bus_find_device_by_name()
> was dropped via put_device() before accessing the device's driver data
> Move put_device() after usage to avoid potential issues.
> 
> Fixes: 2485055394be ("staging: most: core: drop device reference")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>  drivers/most/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/most/core.c b/drivers/most/core.c
> index a635d5082ebb..da319d108ea1 100644
> --- a/drivers/most/core.c
> +++ b/drivers/most/core.c
> @@ -538,8 +538,8 @@ static struct most_channel *get_channel(char *mdev, char *mdev_ch)
>  	dev = bus_find_device_by_name(&mostbus, NULL, mdev);
>  	if (!dev)
>  		return NULL;
> -	put_device(dev);
>  	iface = dev_get_drvdata(dev);
> +	put_device(dev);
>  	list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
>  		if (!strcmp(dev_name(&c->dev), mdev_ch))
>  			return c;
> -- 
> 2.25.1
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
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You are receiving this message because of the following common error(s)
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thanks,

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