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authorTobias Regnery <tobias.regnery@gmail.com>2017-01-24 14:34:24 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-24 21:27:58 +0100
commit185aceefd80f98dc5b9d73eb6cbb70739a5ce4ea (patch)
tree9097881a608091eefbbcc1793df9406f5231c399 /drivers/net
parentalx: fix fallback to msi or legacy interrupts (diff)
downloadlinux-185aceefd80f98dc5b9d73eb6cbb70739a5ce4ea.tar.xz
linux-185aceefd80f98dc5b9d73eb6cbb70739a5ce4ea.zip
alx: work around hardware bug in interrupt fallback path
If requesting msi-x interrupts fails in alx_request_irq we fall back to a single tx queue and msi or legacy interrupts. Currently the adapter stops working in this case and we get tx watchdog timeouts. For reasons unknown the adapter gets confused when we load the dma adresses to the chip in alx_init_ring_ptrs twice: the first time with multiple queues and the second time in the fallback case with a single queue. To fix this move the the call to alx_reinit_rings (which calls alx_init_ring_ptrs) after alx_request_irq. At this time it is clear how much tx queues we have and which dma addresses we use. Fixes: d768319cd427 ("alx: enable multiple tx queues") Signed-off-by: Tobias Regnery <tobias.regnery@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/atheros/alx/main.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c
index 75cbd46e429d..7dcc907a449d 100644
--- a/drivers/net/ethernet/atheros/alx/main.c
+++ b/drivers/net/ethernet/atheros/alx/main.c
@@ -685,8 +685,6 @@ static int alx_alloc_rings(struct alx_priv *alx)
return -ENOMEM;
}
- alx_reinit_rings(alx);
-
return 0;
}
@@ -1242,6 +1240,12 @@ static int __alx_open(struct alx_priv *alx, bool resume)
if (err)
goto out_free_rings;
+ /* must be called after alx_request_irq because the chip stops working
+ * if we copy the dma addresses in alx_init_ring_ptrs twice when
+ * requesting msi-x interrupts failed
+ */
+ alx_reinit_rings(alx);
+
netif_set_real_num_tx_queues(alx->dev, alx->num_txq);
netif_set_real_num_rx_queues(alx->dev, alx->num_rxq);