While upgrading the GTA04 kernel to 3.12-rc4 we came across an issue with libertas/sdio referencing stale memory on ifconfig up when trying to load the firmware (for a second time).
I am not at all sure if the patch is how it should be done and the right location, but it appears to work for us with resetting priv->helper_fw to NULL before asynchronously loading the firmware again.
0001-libertas-sdio-fix-releasing-memory-twice.patch
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