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bh=XS9jf7c2Kn/z8NibUqzFqwM3JlkffV+BoajyGhE4uFo=; b=ZI/zPLpQZ+TKh9V8FEwBXZCpENqPeeR8D9GWurCtJNxogijHv1lOErOW54MxmteYkD FowjGu7RuJZ2ndwIDUSuulDKVFL3gRuKaUPcJOJdKXvPfNoFIzq1kOTJrJhx1mx/D1XG Ggk1fik5EGb5957YlUYl/QDMlnX0jK6wsqxLPpMMPof+MhPpb+DhfOhn1MxUY91rIr0f zpxg39v9i3XegZnQvVJmGqCTibKSTTZ+FQeWTCc+otZOwI/jM6ttLzxIb8EDJsp1f0e5 w2el984MFx9w/IyrCaAAJ+kUTZtHK6DM2iv8qyDQbSPX4thX5K1hfDVLGGm/M5r4VGJ9 aSNQ== X-Gm-Message-State: AOAM5308eOqzdQt1aWPOftCzkVFwBoITyIXb34fnpBIqoJEp9EhuFsEG tgG2sOVLivdiSNg5wOlQq0k= X-Google-Smtp-Source: ABdhPJw86uCZIyZhfUfXRNdYT3BvkAgjE0TmQM8Ra+Ml2xGDSSsiy3C5xqlsxYPFzzSIgbQl2QEvaQ== X-Received: by 2002:a17:903:4101:b029:ea:fc8a:9adb with SMTP id r1-20020a1709034101b02900eafc8a9adbmr6686043pld.49.1618531931378; Thu, 15 Apr 2021 17:12:11 -0700 (PDT) Received: from ilya-fury.hpicorp.net ([2602:61:7344:f100::b87]) by smtp.gmail.com with ESMTPSA id q63sm3563100pjq.17.2021.04.15.17.12.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Apr 2021 17:12:10 -0700 (PDT) From: Ilya Lipnitskiy To: Felix Fietkau , John Crispin , Sean Wang , Mark Lee , "David S. Miller" , Jakub Kicinski , Matthias Brugger , Pablo Neira Ayuso , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Andrew Lunn Cc: Ilya Lipnitskiy Subject: [PATCH net-next,v2] net: ethernet: mediatek: ppe: fix busy wait loop Date: Thu, 15 Apr 2021 17:11:48 -0700 Message-Id: <20210416001148.333969-1-ilya.lipnitskiy@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210415_171212_493448_159B1E43 X-CRM114-Status: GOOD ( 14.64 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org 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 Cc: Felix Fietkau Reviewed-by: Andrew Lunn --- drivers/net/ethernet/mediatek/mtk_ppe.c | 18 +++++++++--------- drivers/net/ethernet/mediatek/mtk_ppe.h | 1 + 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c index 71e1ccea6e72..f4b3fc0eeb50 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include #include "mtk_ppe.h" @@ -44,18 +45,17 @@ 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)