[PATCH -next v2] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()

[PATCH -next v2] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()

[Yang Yingliang]

Sometimes t7xx_cldma_gpd_set_next_ptr() is called under spin lock,
so add 'gfp_mask' parameter in t7xx_cldma_gpd_set_next_ptr() to pass
the flag.

Fixes: 39d439047f1d ("net: wwan: t7xx: Add control DMA interface")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
v2:
  change the parameter to gfp flag.
---
 drivers/net/wwan/t7xx/t7xx_hif_cldma.c | 10 +++++-----
 1 file changed, 5 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..6ff30cb8eb16 100644
--- a/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
+++ b/drivers/net/wwan/t7xx/t7xx_hif_cldma.c
@@ -91,9 +91,9 @@ 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, gfp_t gfp_mask)
 {
-	req->skb = __dev_alloc_skb(size, GFP_KERNEL);
+	req->skb = __dev_alloc_skb(size, gfp_mask);
 	if (!req->skb)
 		return -ENOMEM;
 
@@ -174,7 +174,7 @@ 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, GFP_KERNEL);
 		if (ret)
 			return ret;
 
@@ -402,7 +402,7 @@ 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, GFP_KERNEL);
 	if (val)
 		goto err_free_pool;
 
@@ -801,7 +801,7 @@ 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, GFP_ATOMIC);
 		if (ret)
 			break;
 
-- 
2.25.1

Re: [PATCH -next v2] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()

[Loic Poulain]

On Thu, 19 May 2022 at 05:10, Yang Yingliang <yangyingliang@huawei.com> wrote:
>
> Sometimes t7xx_cldma_gpd_set_next_ptr() is called under spin lock,
> so add 'gfp_mask' parameter in t7xx_cldma_gpd_set_next_ptr() to pass
> the flag.
>
> Fixes: 39d439047f1d ("net: wwan: t7xx: Add control DMA interface")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

Reviewed-by: Loic Poulain <loic.poulain@linaro.org>

Re: [PATCH -next v2] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 19 May 2022 11:21:08 +0800 you wrote:
> Sometimes t7xx_cldma_gpd_set_next_ptr() is called under spin lock,
> so add 'gfp_mask' parameter in t7xx_cldma_gpd_set_next_ptr() to pass
> the flag.
> 
> Fixes: 39d439047f1d ("net: wwan: t7xx: Add control DMA interface")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> 
> [...]

Here is the summary with links:
  - [-next,v2] net: wwan: t7xx: use GFP_ATOMIC under spin lock in t7xx_cldma_gpd_set_next_ptr()
    https://git.kernel.org/netdev/net-next/c/9ee152ee3ee3

You are awesome, thank you!
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