Re: [PATCH v1] wifi: wext: propagate metadata on -E2BIG for GET ioctls

[Johannes Berg]

On Thu, 2025-08-07 at 21:10 +0800, Callan Huang wrote:
> When GET ioctls encounter insufficient buffer (-E2BIG),
> preserve u.data.length metadata in iwreq structure for size detection
> 
> Typical usage in userspace tools like 'iwlist wlan0 scanning':
> - Detect required buffer size via u.data.length
> - Implement retry logic with proper allocation

If you'd sent this patch 15 years ago I probably would've taken it, but
honestly, at this point ... no. Just use nl80211, or large buffers in
the userspace to start with. There's a very small buffer limit _anyway_,
so that getting the full scan list in busy environments is actually
impossible with wext.

johannes