rt2x00: Introduce extra queue entry sanity flag

Add a queue entry flag ENTRY_DATA_STATUS_PENDING,
which can be used to indicate a queue entry has
returned from the hardware and is waiting for
status processing. Using this flag we can add
some extra sanity checks to prevent queue corruption.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 3d4c61fcf06f..fa74acdd271f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -235,6 +235,7 @@ EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 
 void rt2x00lib_dmadone(struct queue_entry *entry)
 {
+        set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
         rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 }