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76 lines
2.3 KiB
Diff
76 lines
2.3 KiB
Diff
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Thu, 12 Jan 2023 10:21:29 +0100
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Subject: [PATCH] net: ethernet: mtk_wed: get rid of queue lock for tx queue
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Similar to MTK Wireless Ethernet Dispatcher (WED) MCU rx queue,
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we do not need to protect WED MCU tx queue with a spin lock since
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the tx queue is accessed in the two following routines:
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- mtk_wed_wo_queue_tx_skb():
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it is run at initialization and during mt7915 normal operation.
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Moreover MCU messages are serialized through MCU mutex.
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- mtk_wed_wo_queue_tx_clean():
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it runs just at mt7915 driver module unload when no more messages
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are sent to the MCU.
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Remove tx queue spinlock.
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Link: https://lore.kernel.org/r/7bd0337b2a13ab1a63673b7c03fd35206b3b284e.1673515140.git.lorenzo@kernel.org
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_wed_wo.c
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+++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.c
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@@ -258,7 +258,6 @@ mtk_wed_wo_queue_alloc(struct mtk_wed_wo
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int n_desc, int buf_size, int index,
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struct mtk_wed_wo_queue_regs *regs)
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{
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- spin_lock_init(&q->lock);
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q->regs = *regs;
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q->n_desc = n_desc;
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q->buf_size = buf_size;
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@@ -290,7 +289,6 @@ mtk_wed_wo_queue_tx_clean(struct mtk_wed
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struct page *page;
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int i;
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- spin_lock_bh(&q->lock);
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for (i = 0; i < q->n_desc; i++) {
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struct mtk_wed_wo_queue_entry *entry = &q->entry[i];
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@@ -299,7 +297,6 @@ mtk_wed_wo_queue_tx_clean(struct mtk_wed
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skb_free_frag(entry->buf);
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entry->buf = NULL;
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}
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- spin_unlock_bh(&q->lock);
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if (!q->cache.va)
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return;
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@@ -347,8 +344,6 @@ int mtk_wed_wo_queue_tx_skb(struct mtk_w
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int ret = 0, index;
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u32 ctrl;
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- spin_lock_bh(&q->lock);
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-
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q->tail = mtk_wed_mmio_r32(wo, q->regs.dma_idx);
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index = (q->head + 1) % q->n_desc;
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if (q->tail == index) {
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@@ -379,8 +374,6 @@ int mtk_wed_wo_queue_tx_skb(struct mtk_w
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mtk_wed_wo_queue_kick(wo, q, q->head);
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mtk_wed_wo_kickout(wo);
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out:
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- spin_unlock_bh(&q->lock);
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-
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dev_kfree_skb(skb);
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return ret;
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--- a/drivers/net/ethernet/mediatek/mtk_wed_wo.h
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+++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.h
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@@ -211,7 +211,6 @@ struct mtk_wed_wo_queue {
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struct mtk_wed_wo_queue_regs regs;
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struct page_frag_cache cache;
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- spinlock_t lock;
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struct mtk_wed_wo_queue_desc *desc;
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dma_addr_t desc_dma;
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