linux-kernel - [PATCH AUTOSEL 6.1 01/93] hv_netvsc: Allocate memory in netvsc_dma_map() with GFP

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Message-Id: <20230215070620.2718851-1-sashal@kernel.org>
Date:   Wed, 15 Feb 2023 02:04:48 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Michael Kelley <mikelley@...rosoft.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
        Tianyu.Lan@...rosoft.com, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 01/93] hv_netvsc: Allocate memory in netvsc_dma_map() with GFP_ATOMIC

From: Michael Kelley <mikelley@...rosoft.com>

commit c6aa9d3b43cd11ac13a8220368a3b0483c6751d4 upstream.

Memory allocations in the network transmit path must use GFP_ATOMIC
so they won't sleep.

Reported-by: Paolo Abeni <pabeni@...hat.com>
Link: https://lore.kernel.org/lkml/8a4d08f94d3e6fe8b6da68440eaa89a088ad84f9.camel@redhat.com/
Fixes: 846da38de0e8 ("net: netvsc: Add Isolation VM support for netvsc driver")
Cc: stable@...r.kernel.org
Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
Link: https://lore.kernel.org/r/1675714317-48577-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/hyperv/netvsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index e02d1e3ef672a..79f4e13620a46 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1034,7 +1034,7 @@ static int netvsc_dma_map(struct hv_device *hv_dev,
 
 	packet->dma_range = kcalloc(page_count,
 				    sizeof(*packet->dma_range),
-				    GFP_KERNEL);
+				    GFP_ATOMIC);
 	if (!packet->dma_range)
 		return -ENOMEM;
 
-- 
2.39.0