| Message ID | 20210416003747.340041-1-ilya.lipnitskiy@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net-next,v3] net: ethernet: mediatek: ppe: fix busy wait loop | expand |
Hello: This patch was applied to netdev/net-next.git (refs/heads/master): On Thu, 15 Apr 2021 17:37:48 -0700 you wrote: > 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. > > Fix by using readl_poll_timeout as a more standard and less error-prone > solution. > > [...] Here is the summary with links: - [net-next,v3] net: ethernet: mediatek: ppe: fix busy wait loop https://git.kernel.org/netdev/net-next/c/c5d66587b890 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c index 71e1ccea6e72..3ad10c793308 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c @@ -2,9 +2,8 @@ /* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */ #include <linux/kernel.h> -#include <linux/jiffies.h> -#include <linux/delay.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/etherdevice.h> #include <linux/platform_device.h> #include "mtk_ppe.h" @@ -44,18 +43,17 @@ static u32 ppe_clear(struct mtk_ppe *ppe, u32 reg, u32 val) static int mtk_ppe_wait_busy(struct mtk_ppe *ppe) { - unsigned long timeout = jiffies + HZ; - - while (time_is_before_jiffies(timeout)) { - if (!(ppe_r32(ppe, MTK_PPE_GLO_CFG) & MTK_PPE_GLO_CFG_BUSY)) - return 0; + int ret; + u32 val; - usleep_range(10, 20); - } + ret = readl_poll_timeout(ppe->base + MTK_PPE_GLO_CFG, val, + !(val & MTK_PPE_GLO_CFG_BUSY), + 20, MTK_PPE_WAIT_TIMEOUT_US); - dev_err(ppe->dev, "PPE table busy"); + if (ret) + dev_err(ppe->dev, "PPE table busy"); - return -ETIMEDOUT; + return ret; } static void mtk_ppe_cache_clear(struct mtk_ppe *ppe) diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h index 51bd5e75bbbd..242fb8f2ae65 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe.h +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h @@ -12,6 +12,7 @@ #define MTK_PPE_ENTRIES_SHIFT 3 #define MTK_PPE_ENTRIES (1024 << MTK_PPE_ENTRIES_SHIFT) #define MTK_PPE_HASH_MASK (MTK_PPE_ENTRIES - 1) +#define MTK_PPE_WAIT_TIMEOUT_US 1000000 #define MTK_FOE_IB1_UNBIND_TIMESTAMP GENMASK(7, 0) #define MTK_FOE_IB1_UNBIND_PACKETS GENMASK(23, 8)
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. Fix by using readl_poll_timeout as a more standard and less error-prone solution. Fixes: ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for initializing the PPE") Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> Cc: Felix Fietkau <nbd@nbd.name> Reviewed-by: Andrew Lunn <andrew@lunn.ch> --- v2: - Use readl_poll_timeout as suggested by Andrew Lunn v3: - Remove unused #include's drivers/net/ethernet/mediatek/mtk_ppe.c | 20 +++++++++----------- drivers/net/ethernet/mediatek/mtk_ppe.h | 1 + 2 files changed, 10 insertions(+), 11 deletions(-)