[ath9k] Remove broken ath_rxbuf_alloc()

ath_rx_init() demonstrates some serious confusion over how to use
pointers, resulting in (uint32_t*)NULL being used as a temporary
variable.  This does not end well.

The broken code in question is performing manual alignment of I/O
buffers, which can now be achieved more simply using alloc_iob_raw().
Fix by removing ath_rxbuf_alloc() entirely.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/ath/ath.h

@@ -229,10 +229,6 @@ struct ath_common {
 	int btcoex_enabled;
 };
 
-struct io_buffer *ath_rxbuf_alloc(struct ath_common *common,
-				u32 len,
-				u32 *iob_addr);
-
 void ath_hw_setbssidmask(struct ath_common *common);
 int ath_hw_keyreset(struct ath_common *common, u16 entry);
 void ath_hw_cycle_counters_update(struct ath_common *common);

src/drivers/net/ath/ath9k/ath9k_recv.c

@@ -98,7 +98,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct io_buffer *iob;
-	u32 *iob_addr = NULL;
 	struct ath_buf *bf;
 	int error = 0;
 
@@ -122,15 +121,14 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
 	}
 
 	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
-		iob = ath_rxbuf_alloc(common, common->rx_bufsize,
-				      iob_addr);
+		iob = alloc_iob_raw ( common->rx_bufsize, common->cachelsz, 0 );
 		if (iob == NULL) {
 			error = -ENOMEM;
 			goto err;
 		}
 
 		bf->bf_mpdu = iob;
-		bf->bf_buf_addr = *iob_addr;
+		bf->bf_buf_addr = virt_to_bus ( iob->data );
 	}
 	sc->rx.rxlink = NULL;
 
@@ -433,7 +431,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, int hp __unused)
 {
 	struct ath_buf *bf;
 	struct io_buffer *iob = NULL, *requeue_iob;
-	u32 *requeue_iob_addr = NULL;
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	/*
@@ -476,7 +473,8 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, int hp __unused)
 
 		/* Ensure we always have an iob to requeue once we are done
 		 * processing the current buffer's iob */
-		requeue_iob = ath_rxbuf_alloc(common, common->rx_bufsize, requeue_iob_addr);
+		requeue_iob = alloc_iob_raw ( common->rx_bufsize,
+					      common->cachelsz, 0 );
 
 		/* If there is no memory we ignore the current RX'd frame,
 		 * tell hardware it can give us a new frame using the old
@@ -491,7 +489,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, int hp __unused)
 
 		/* We will now give hardware our shiny new allocated iob */
 		bf->bf_mpdu = requeue_iob;
-		bf->bf_buf_addr = *requeue_iob_addr;
+		bf->bf_buf_addr = virt_to_bus ( requeue_iob->data );
 
 		/*
 		 * change the default rx antenna if rx diversity chooses the