From: Ilya Lipnitskiy Date: Mon, 8 Feb 2021 04:17:12 +0000 (-0800) Subject: kernel: fix busy wait loop in mediatek PPE code X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=3da4acaa7bba;p=openwrt%2Fstaging%2Fnoltari.git kernel: fix busy wait loop in mediatek PPE code The intention is for the loop to timeout if the body does not succeed. The current logic calls time_is_before_jiffies(timeout) which is false until after the timeout, so the loop body never executes. time_is_after_jiffies(timeout) will return true until timeout is less than jiffies, which is the intended behavior here. Signed-off-by: Ilya Lipnitskiy --- diff --git a/target/linux/generic/pending-5.4/770-15-net-ethernet-mediatek-mtk_eth_soc-add-support-for-in.patch b/target/linux/generic/pending-5.4/770-15-net-ethernet-mediatek-mtk_eth_soc-add-support-for-in.patch index d679e30bea..2614502f5a 100644 --- a/target/linux/generic/pending-5.4/770-15-net-ethernet-mediatek-mtk_eth_soc-add-support-for-in.patch +++ b/target/linux/generic/pending-5.4/770-15-net-ethernet-mediatek-mtk_eth_soc-add-support-for-in.patch @@ -183,7 +183,7 @@ Signed-off-by: Felix Fietkau +{ + unsigned long timeout = jiffies + HZ; + -+ while (time_is_before_jiffies(timeout)) { ++ while (time_is_after_jiffies(timeout)) { + if (!(ppe_r32(ppe, MTK_PPE_GLO_CFG) & MTK_PPE_GLO_CFG_BUSY)) + return 0; +