mediatek: fix a sleep while atomic bug inside the ethernet driver

this sometimes happens when we have hw nat enabled.

Signed-off-by: John Crispin <john@phrozen.org>

diff --git a/target/linux/mediatek/patches-4.9/0063-atomic-sleep.patch b/target/linux/mediatek/patches-4.9/0063-atomic-sleep.patch
new file mode 100644 (file)
index 0000000..3a8cd59
--- /dev/null
+++ b/target/linux/mediatek/patches-4.9/0063-atomic-sleep.patch
@@ -0,0 +1,40 @@
+Index: linux-4.9.50/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+===================================================================
+--- linux-4.9.50.orig/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ linux-4.9.50/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -1533,7 +1533,10 @@ static void mtk_hwlro_rx_uninit(struct m
+       for (i = 0; i < 10; i++) {
+               val = mtk_r32(eth, MTK_PDMA_LRO_CTRL_DW0);
+               if (val & MTK_LRO_RING_RELINQUISH_DONE) {
+-                      msleep(20);
++                      if (in_atomic())
++                              mdelay(20);
++                      else
++                              msleep(20);
+                       continue;
+               }
+               break;
+@@ -1951,7 +1954,10 @@ static void mtk_stop_dma(struct mtk_eth
+       for (i = 0; i < 10; i++) {
+               val = mtk_r32(eth, glo_cfg);
+               if (val & (MTK_TX_DMA_BUSY | MTK_RX_DMA_BUSY)) {
+-                      msleep(20);
++                      if (in_atomic())
++                              mdelay(20);
++                      else
++                              msleep(20);
+                       continue;
+               }
+               break;
+@@ -1996,7 +2002,10 @@ static void ethsys_reset(struct mtk_eth
+                          reset_bits,
+                          reset_bits);
+ 
+-      usleep_range(1000, 1100);
++      if (in_atomic())
++              udelay(1000);
++      else
++              usleep_range(1000, 1100);
+       regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
+                          reset_bits,
+                          ~reset_bits);