[PATCH 3/3] net: ag71xx: re-enable TX interrupts on RX OOM

[Rosen Penev]

When the RX ring runs out of buffers the OOM path calls
napi_complete() but does not re-enable interrupts.  Because
INT_POLL masks both RX and TX events, TX completions are
blocked until the OOM timer fires (~100 ms), which can cause
TX ring exhaustion and dropped packets.

Restore TX interrupt delivery so the engine can drain completed
descriptors while NAPI waits for RX buffer memory.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/net/ethernet/atheros/ag71xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
index 77f8e75e98ac..a4e52bc42091 100644
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -1720,6 +1720,7 @@ static int ag71xx_poll(struct napi_struct *napi, int limit)
 
 	mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
 	napi_complete(napi);
+	ag71xx_int_enable(ag, AG71XX_INT_TX);
 	return 0;
 }
 
-- 
2.54.0