AcoSail/kernel_optimize_test
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ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue

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ntb_transport_create_queue() is never called in atomic context.

ntb_transport_create_queue() is only called by ntb_netdev_probe(),
which is set as ".probe" in struct ntb_transport_client.

Despite never getting called from atomic context,
ntb_transport_create_queue() calls kzalloc_node() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Jia-Ju Bai 2018-04-10 21:17:54 +08:00 committed by Jon Mason
parent 82edcc758f
commit c9160b6925
1 changed files with 2 additions and 2 deletions
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4
drivers/ntb/ntb_transport.c
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@ -1828,7 +1828,7 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
qp->rx_dma_chan ? "DMA" : "CPU");
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node);
entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node);
if (!entry)
goto err1;
@ -1839,7 +1839,7 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES;
for (i = 0; i < qp->tx_max_entry; i++) {
entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node);
entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node);
if (!entry)
goto err2;