linux-kernel - [PATCH net-next] net: wwan: t7xx: fix GFP_KERNEL usage in spin

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Message-ID: <20220514091443.4150162-1-william.xuanziyang@huawei.com>
Date:   Sat, 14 May 2022 17:14:43 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <chandrashekar.devegowda@...el.com>, <linuxwwan@...el.com>,
        <chiranjeevi.rapolu@...ux.intel.com>, <haijun.liu@...iatek.com>,
        <m.chetan.kumar@...ux.intel.com>,
        <ricardo.martinez@...ux.intel.com>, <loic.poulain@...aro.org>,
        <ryazanov.s.a@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next] net: wwan: t7xx: fix GFP_KERNEL usage in spin_lock context

t7xx_cldma_clear_rxq() call t7xx_cldma_alloc_and_map_skb() in spin_lock
context, But __dev_alloc_skb() in t7xx_cldma_alloc_and_map_skb() uses
GFP_KERNEL, that will introduce scheduling factor in spin_lock context.

Replace GFP_KERNEL with GFP_ATOMIC to fix it.

Fixes: 39d439047f1d ("net: wwan: t7xx: Add control DMA interface")
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
index 46066dcd2607..54c34639f1a5 100644
--- a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
@@ -93,7 +93,7 @@ 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)
 {
-	req->skb = __dev_alloc_skb(size, GFP_KERNEL);
+	req->skb = __dev_alloc_skb(size, GFP_ATOMIC);
 	if (!req->skb)
 		return -ENOMEM;
 
-- 
2.25.1