net: ethernet: mtk_wed: get rid of queue lock for rx queue

Queue spinlock is currently held in mtk_wed_wo_queue_rx_clean and
mtk_wed_wo_queue_refill routines for MTK Wireless Ethernet Dispatcher
MCU rx queue. mtk_wed_wo_queue_refill() is running during initialization
and in rx tasklet while mtk_wed_wo_queue_rx_clean() is running in
mtk_wed_wo_hw_deinit() during hw de-init phase after rx tasklet has been
disabled. Since mtk_wed_wo_queue_rx_clean and mtk_wed_wo_queue_refill
routines can't run concurrently get rid of spinlock for mcu rx queue.

Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/36ec3b729542ea60898471d890796f745479ba32.1673342990.git.lorenzo@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mediatek/mtk_wed_wo.c b/drivers/net/ethernet/mediatek/mtk_wed_wo.c
index a0a3964..d32b864 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_wed_wo.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.c
@@ -138,7 +138,6 @@ mtk_wed_wo_queue_refill(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q,
        enum dma_data_direction dir = rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
        int n_buf = 0;
 
-       spin_lock_bh(&q->lock);
        while (q->queued < q->n_desc) {
                struct mtk_wed_wo_queue_entry *entry;
                dma_addr_t addr;
@@ -172,7 +171,6 @@ mtk_wed_wo_queue_refill(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q,
                q->queued++;
                n_buf++;
        }
-       spin_unlock_bh(&q->lock);
 
        return n_buf;
 }
@@ -316,7 +314,6 @@ mtk_wed_wo_queue_rx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q)
 {
        struct page *page;
 
-       spin_lock_bh(&q->lock);
        for (;;) {
                void *buf = mtk_wed_wo_dequeue(wo, q, NULL, true);
 
@@ -325,7 +322,6 @@ mtk_wed_wo_queue_rx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q)
 
                skb_free_frag(buf);
        }
-       spin_unlock_bh(&q->lock);
 
        if (!q->cache.va)
                return;