[PATCH v2 net-next 1/7] MIPS: lantiq: dma: add dev pointer

[Hauke Mehrtens]

dma_zalloc_coherent() now crashes if no dev pointer is given.
Add a dev pointer to the ltq_dma_channel structure and fill it in the
driver using it.

This fixes a bug introduced in kernel 4.19.

Signed-off-by: Hauke Mehrtens <ha...@hauke-m.de>
---
 arch/mips/include/asm/mach-lantiq/xway/xway_dma.h | 1 +
 arch/mips/lantiq/xway/dma.c                       | 4 ++--
 drivers/net/ethernet/lantiq_etop.c                | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/mach-lantiq/xway/xway_dma.h 
b/arch/mips/include/asm/mach-lantiq/xway/xway_dma.h
index 4901833498f7..8441b2698e64 100644
--- a/arch/mips/include/asm/mach-lantiq/xway/xway_dma.h
+++ b/arch/mips/include/asm/mach-lantiq/xway/xway_dma.h
@@ -40,6 +40,7 @@ struct ltq_dma_channel {
        int desc;                       /* the current descriptor */
        struct ltq_dma_desc *desc_base; /* the descriptor base */
        int phys;                       /* physical addr */
+       struct device *dev;
 };
 
 enum {
diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
index 4b9fbb6744ad..664f2f7f55c1 100644
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -130,7 +130,7 @@ ltq_dma_alloc(struct ltq_dma_channel *ch)
        unsigned long flags;
 
        ch->desc = 0;
-       ch->desc_base = dma_zalloc_coherent(NULL,
+       ch->desc_base = dma_zalloc_coherent(ch->dev,
                                LTQ_DESC_NUM * LTQ_DESC_SIZE,
                                &ch->phys, GFP_ATOMIC);
 
@@ -182,7 +182,7 @@ ltq_dma_free(struct ltq_dma_channel *ch)
        if (!ch->desc_base)
                return;
        ltq_dma_close(ch);
-       dma_free_coherent(NULL, LTQ_DESC_NUM * LTQ_DESC_SIZE,
+       dma_free_coherent(ch->dev, LTQ_DESC_NUM * LTQ_DESC_SIZE,
                ch->desc_base, ch->phys);
 }
 EXPORT_SYMBOL_GPL(ltq_dma_free);
diff --git a/drivers/net/ethernet/lantiq_etop.c 
b/drivers/net/ethernet/lantiq_etop.c
index 7a637b51c7d2..e08301d833e2 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -274,6 +274,7 @@ ltq_etop_hw_init(struct net_device *dev)
                struct ltq_etop_chan *ch = &priv->ch[i];
 
                ch->idx = ch->dma.nr = i;
+               ch->dma.dev = &priv->pdev->dev;
 
                if (IS_TX(i)) {
                        ltq_dma_alloc_tx(&ch->dma);
-- 
2.11.0