On Wed, 2009-02-04 at 18:23 -0500, Dan Williams wrote: > On Wed, 2009-02-04 at 16:08 +0100, Samuel Ortiz wrote: > > From: Samuel Ortiz <samuel.ortiz@xxxxxxxxx> > > > > In very dense environment, the scan result buffer can get really large, mostly > > due to the addition of proprietary IEs. iwlist fails, typically warning about: > > "print_scanning_info: Allocation failed". wpa_supplicant fails as well, after > > reallocating the scan result buffer several times, up to 132 Kbytes: > > [snip] > > Scan results did not fit - trying larger buffer (131072 bytes) > > ioctl[SIOCGIWSCAN]: Argument list too long > > > > By adding a mac80211 module parameter, we can filter the scan results and keep > > only the ones userspace currently worries about, i.e. WPA1, WPA2, WMM and WPS. > > A somewhat more acceptable, but still unacceptable hack would be to > figure out when the returned scan results buffer would be too large, and > automatically filter the IEs when it would be to large. Nope, that doesn't even work. You'd filter even before the app decided to no longer reallocate the scan buffer. johannes
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