ath9k: Get rid of unnecessary ATOMIC memory alloc during init time

We can sleep for memory during init time and so allocating rx buffers,
descriptro buffers with GFP_KERNEL should help us to get rid of transient
alloc fails.
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/main.c

@@ -1804,7 +1804,7 @@ int ath_descdma_setup(struct ath_softc *sc, struct ath_descdma *dd,
 
 	/* allocate descriptors */
 	dd->dd_desc = dma_alloc_coherent(sc->dev, dd->dd_desc_len,
-					 &dd->dd_desc_paddr, GFP_ATOMIC);
+					 &dd->dd_desc_paddr, GFP_KERNEL);
 	if (dd->dd_desc == NULL) {
 		error = -ENOMEM;
 		goto fail;
@@ -1816,12 +1816,11 @@ int ath_descdma_setup(struct ath_softc *sc, struct ath_descdma *dd,
 
 	/* allocate buffers */
 	bsize = sizeof(struct ath_buf) * nbuf;
-	bf = kmalloc(bsize, GFP_KERNEL);
+	bf = kzalloc(bsize, GFP_KERNEL);
 	if (bf == NULL) {
 		error = -ENOMEM;
 		goto fail2;
 	}
-	memset(bf, 0, bsize);
 	dd->dd_bufptr = bf;
 
 	INIT_LIST_HEAD(head);

drivers/net/wireless/ath9k/recv.c

@@ -100,7 +100,7 @@ static u64 ath_extend_tsf(struct ath_softc *sc, u32 rstamp)
 	return (tsf & ~0x7fff) | rstamp;
 }
 
-static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, u32 len)
+static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, u32 len, gfp_t gfp_mask)
 {
 	struct sk_buff *skb;
 	u32 off;
@@ -118,7 +118,7 @@ static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, u32 len)
 	 * Unfortunately this means we may get 8 KB here from the
 	 * kernel... and that is actually what is observed on some
 	 * systems :( */
-	skb = dev_alloc_skb(len + sc->cachelsz - 1);
+	skb = __dev_alloc_skb(len + sc->cachelsz - 1, gfp_mask);
 	if (skb != NULL) {
 		off = ((unsigned long) skb->data) % sc->cachelsz;
 		if (off != 0)
@@ -306,7 +306,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
 		}
 
 		list_for_each_entry(bf, &sc->rx.rxbuf, list) {
-			skb = ath_rxbuf_alloc(sc, sc->rx.bufsize);
+			skb = ath_rxbuf_alloc(sc, sc->rx.bufsize, GFP_KERNEL);
 			if (skb == NULL) {
 				error = -ENOMEM;
 				break;
@@ -580,7 +580,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
 
 		/* Ensure we always have an skb to requeue once we are done
 		 * processing the current buffer's skb */
-		requeue_skb = ath_rxbuf_alloc(sc, sc->rx.bufsize);
+		requeue_skb = ath_rxbuf_alloc(sc, sc->rx.bufsize, GFP_ATOMIC);
 
 		/* If there is no memory we ignore the current RX'd frame,
 		 * tell hardware it can give us a new frame using the old