net: hns3: fix one incorrect value of page pool info when queried by debugfs
authorHao Chen <chenhao288@hisilicon.com>
Fri, 26 Nov 2021 12:03:17 +0000 (20:03 +0800)
committerJakub Kicinski <kuba@kernel.org>
Fri, 26 Nov 2021 19:36:29 +0000 (11:36 -0800)
commit9c14791748708d87c4d02ba74eb7e281e141d6e4
treec28a3ddd1d0fd128ca6af47c6e27458ff5f530f2
parentb8af344cfea189cdc0fef41345e55aed76723615
net: hns3: fix one incorrect value of page pool info when queried by debugfs

Currently, when user queries page pool info by debugfs command
"cat page_pool_info", the cnt of allocated page for page pool may be
incorrect because of memory inconsistency problem caused by compiler
optimization.

So this patch uses READ_ONCE() to read value of pages_state_hold_cnt to
fix this problem.

Fixes: 850bfb912a6d ("net: hns3: debugfs add support dumping page pool info")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c