From: Jia-Ju Bai Date: Tue, 10 Apr 2018 13:17:54 +0000 (+0800) Subject: ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue X-Git-Tag: v4.18-rc1~41^2 X-Git-Url: https://repo.jachan.dev/linux.git/commitdiff_plain/c9160b69258ef46ab62c27a09decb8fef311e700 ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue 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 Signed-off-by: Jon Mason --- diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index c848fb3d5099..8145be34328b 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -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;