linux-kernel - [PATCH -next] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next

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Date:   Wed, 18 May 2022 17:07:38 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>
CC:     <haijun.liu@...iatek.com>, <chandrashekar.devegowda@...el.com>,
        <ricardo.martinez@...ux.intel.com>, <loic.poulain@...aro.org>,
        <davem@...emloft.net>, <kuba@...nel.org>
Subject: [PATCH -next] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()

Sometimes t7xx_cldma_gpd_set_next_ptr() is called under spin lock,
so add a parameter in t7xx_cldma_gpd_set_next_ptr() to make if it
use GFP_ATOMIC flag.

Fixes: 39d439047f1d ("net: wwan: t7xx: Add control DMA interface")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
index 0c52801ed0de..1fa9bb763831 100644
--- a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
@@ -91,9 +91,12 @@ static void t7xx_cldma_gpd_set_next_ptr(struct cldma_gpd *gpd, dma_addr_t next_p
 }
 
 static int t7xx_cldma_alloc_and_map_skb(struct cldma_ctrl *md_ctrl, struct cldma_request *req,
-					size_t size)
+					size_t size, bool is_atomic)
 {
-	req->skb = __dev_alloc_skb(size, GFP_KERNEL);
+	if (is_atomic)
+		req->skb = __dev_alloc_skb(size, GFP_ATOMIC);
+	else
+		req->skb = __dev_alloc_skb(size, GFP_KERNEL);
 	if (!req->skb)
 		return -ENOMEM;
 
@@ -174,7 +177,7 @@ static int t7xx_cldma_gpd_rx_from_q(struct cldma_queue *queue, int budget, bool
 		spin_unlock_irqrestore(&queue->ring_lock, flags);
 		req = queue->rx_refill;
 
-		ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, queue->tr_ring->pkt_size);
+		ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, queue->tr_ring->pkt_size, false);
 		if (ret)
 			return ret;
 
@@ -402,7 +405,7 @@ static struct cldma_request *t7xx_alloc_rx_request(struct cldma_ctrl *md_ctrl, s
 	if (!req->gpd)
 		goto err_free_req;
 
-	val = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, pkt_size);
+	val = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, pkt_size, false);
 	if (val)
 		goto err_free_pool;
 
@@ -801,7 +804,7 @@ static int t7xx_cldma_clear_rxq(struct cldma_ctrl *md_ctrl, int qnum)
 		if (req->skb)
 			continue;
 
-		ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, rxq->tr_ring->pkt_size);
+		ret = t7xx_cldma_alloc_and_map_skb(md_ctrl, req, rxq->tr_ring->pkt_size, true);
 		if (ret)
 			break;
 
-- 
2.25.1