Re: [PATCH wireless-next] wifi: rt2x00: allocate anchor with rt2x00dev

[Stanislaw Gruszka <stf_xl@wp.pl>]

Hi,

On Thu, Apr 30, 2026 at 04:22:06PM -0700, Rosen Penev wrote:
> Instead of being creative with devm, allocate with rt2x00dev by using a
> flexible array member. Simplifies code slightly.

I think this patch is more creative. Using a flexible array member
is less conventional than the current approach of allocating separately
and storing a pointer. But OK, lets get rid of 9 LOC.

Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>

> It's worth noting that in 25369b22223d1c56e42a0cd4ac9137349d5a898e , the
> proper device was set to the devm call as it seems there was confusion
> there.
> 
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
>
> ---
>  drivers/net/wireless/ralink/rt2x00/rt2x00.h    |  3 ++-
>  drivers/net/wireless/ralink/rt2x00/rt2x00usb.c | 11 +----------
>  2 files changed, 3 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00.h b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
> index 665887e9b118..7d313e86d3f2 100644
> --- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
> +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
> @@ -1009,11 +1009,12 @@ struct rt2x00_dev {
>  	/* Extra TX headroom required for alignment purposes. */
>  	unsigned int extra_tx_headroom;
> 
> -	struct usb_anchor *anchor;
>  	unsigned int num_proto_errs;
> 
>  	/* Clock for System On Chip devices. */
>  	struct clk *clk;
> +
> +	struct usb_anchor anchor[];
>  };
> 
>  struct rt2x00_bar_list_entry {
> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> index 174d89b0b1d7..47e427ea8622 100644
> --- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> @@ -804,7 +804,7 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
> 
>  	usb_reset_device(usb_dev);
> 
> -	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
> +	hw = ieee80211_alloc_hw(struct_size(rt2x00dev, anchor, 1), ops->hw);
>  	if (!hw) {
>  		rt2x00_probe_err("Failed to allocate hardware\n");
>  		return -ENOMEM;
> @@ -826,13 +826,6 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
>  	if (retval)
>  		goto exit_free_device;
> 
> -	rt2x00dev->anchor = devm_kmalloc(&usb_intf->dev,
> -					sizeof(struct usb_anchor),
> -					GFP_KERNEL);
> -	if (!rt2x00dev->anchor) {
> -		retval = -ENOMEM;
> -		goto exit_free_reg;
> -	}
>  	init_usb_anchor(rt2x00dev->anchor);
> 
>  	retval = rt2x00lib_probe_dev(rt2x00dev);
> @@ -843,8 +836,6 @@ int rt2x00usb_probe(struct usb_interface *usb_intf,
> 
>  exit_free_anchor:
>  	usb_kill_anchored_urbs(rt2x00dev->anchor);
> -
> -exit_free_reg:
>  	rt2x00usb_free_reg(rt2x00dev);
> 
>  exit_free_device:
> --
> 2.54.0
>