[PATCH 3.19.y-ckt 029/251] spi: fix race freeing dummy_tx/rx before it is unmapped

3.19.8-ckt4 -stable review patch. If anyone has any objections, please let me know. -- From: Martin Sperl commit 8e76ef88f607174082023f50b87fe12dcdbe5db5 upstream. Fix a race (with some kernel configurations) where a queued master->pump_messages runs and frees dummy_tx/rx

[PATCH 3.19.y-ckt 029/251] spi: fix race freeing dummy_tx/rx before it is unmapped

3.19.8-ckt4 -stable review patch. If anyone has any objections, please let me know. -- From: Martin Sperl ker...@martin.sperl.org commit 8e76ef88f607174082023f50b87fe12dcdbe5db5 upstream. Fix a race (with some kernel configurations) where a queued master-pump_messages runs