wifi: mt76: add DMA mapping error check in mt76_alloc_txwi()

Add 'dma_mapping_error()' check in 'mt76_alloc_txwi()'.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index 6a6af1d3d68764c85140416db4b06dffdd0bcf97..643e18ebb5ee61abcc0a877e4590ca8860fe9d28 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -53,6 +53,11 @@ mt76_alloc_txwi(struct mt76_dev *dev)
 
        addr = dma_map_single(dev->dma_dev, txwi, dev->drv->txwi_size,
                              DMA_TO_DEVICE);
+       if (unlikely(dma_mapping_error(dev->dma_dev, addr))) {
+               kfree(txwi);
+               return NULL;
+       }
+
        t = (struct mt76_txwi_cache *)(txwi + dev->drv->txwi_size);
        t->dma_addr = addr;