[PATCH 4.9 064/104] qed: Fix possible system hang in the dcbnl-getdcbx() path.

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "sudarsana.kall...@cavium.com" <sudarsana.kall...@cavium.com>


[ Upstream commit 62289ba27558553871fd047baadaaeda886c6a63 ]

qed_dcbnl_get_dcbx() API uses kmalloc in GFT_KERNEL mode. The API gets
invoked in the interrupt context by qed_dcbnl_getdcbx callback. Need
to invoke this kmalloc in atomic mode.

Signed-off-by: Sudarsana Reddy Kalluru <sudarsana.kall...@cavium.com>
Signed-off-by: Yuval Mintz <yuval.mi...@cavium.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/qlogic/qed/qed_dcbx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/qlogic/qed/qed_dcbx.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dcbx.c
@@ -1222,7 +1222,7 @@ static struct qed_dcbx_get *qed_dcbnl_ge
 {
        struct qed_dcbx_get *dcbx_info;
 
-       dcbx_info = kzalloc(sizeof(*dcbx_info), GFP_KERNEL);
+       dcbx_info = kmalloc(sizeof(*dcbx_info), GFP_ATOMIC);
        if (!dcbx_info)
                return NULL;