[PATCH 7/8] tftp: fix WRQ support

[Enrico Scholz <enrico.scholz@sigma-chemnitz.de>]

"tftp: allocate buffers and fifo dynamically" broke WRQ support.
Reenable it.

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
---
 fs/tftp.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/fs/tftp.c b/fs/tftp.c
index c00857ecfa28..174365d6ed0a 100644
--- a/fs/tftp.c
+++ b/fs/tftp.c
@@ -673,22 +673,36 @@ static void tftp_recv(struct file_priv *priv,
 		if (!priv->push)
 			break;
 
-		priv->block = ntohs(*(uint16_t *)pkt);
-		if (priv->block != priv->last_block) {
-			pr_vdebug("ack %d != %d\n", priv->block, priv->last_block);
+		block = ntohs(*(uint16_t *)pkt);
+		if (block != priv->last_block) {
+			pr_vdebug("ack %d != %d\n", block, priv->last_block);
 			break;
 		}
 
-		priv->block++;
+		switch (priv->state) {
+		case STATE_WRQ:
+			priv->tftp_con->udp->uh_dport = uh_sport;
+			priv->state = STATE_START;
+			break;
 
-		tftp_timer_reset(priv);
+		case STATE_WAITACK:
+			priv->state = STATE_WDATA;
+			break;
 
-		if (priv->state == STATE_LAST) {
+		case STATE_LAST:
 			priv->state = STATE_DONE;
 			break;
+
+		default:
+			pr_warn("ACK packet in %s state\n",
+				tftp_states[priv->state]);
+			goto ack_out;
 		}
-		priv->tftp_con->udp->uh_dport = uh_sport;
-		priv->state = STATE_WDATA;
+
+		priv->block = block + 1;
+		tftp_timer_reset(priv);
+
+	ack_out:
 		break;
 
 	case TFTP_OACK:
-- 
2.37.2