linux-kernel - [PATCH 4/4] mtd: rawnand: meson: only initialize the RB completion once

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Message-Id: <20190411220056.19109-5-martin.blumenstingl@googlemail.com>
Date:   Fri, 12 Apr 2019 00:00:56 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     liang.yang@...ogic.com, linux-amlogic@...ts.infradead.org,
        linux-mtd@...ts.infradead.org, richard@....at,
        miquel.raynal@...tlin.com
Cc:     linux-arm-kernel@...ts.infradead.org, marek.vasut@...il.com,
        linux-kernel@...r.kernel.org, computersforpeace@...il.com,
        dwmw2@...radead.org, bbrezillon@...nel.org,
        jianxin.pan@...ogic.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 4/4] mtd: rawnand: meson: only initialize the RB completion once

Documentation/scheduler/completion.txt states:
  Calling init_completion() on the same completion object twice is
  most likely a bug as it re-initializes the queue to an empty queue and
  enqueued tasks could get "lost" - use reinit_completion() in that case,
  but be aware of other races.

Initialize nfc->completion in meson_nfc_probe using init_completion and
change the call in meson_nfc_queue_rb to reinit_completion so the logic
matches what the documentation suggests.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/mtd/nand/raw/meson_nand.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 57cc4bd3f665..ea57ddcec41e 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -400,7 +400,7 @@ static int meson_nfc_queue_rb(struct meson_nfc *nfc, int timeout_ms)
 	cfg |= NFC_RB_IRQ_EN;
 	writel(cfg, nfc->reg_base + NFC_REG_CFG);
 
-	init_completion(&nfc->completion);
+	reinit_completion(&nfc->completion);
 
 	/* use the max erase time as the maximum clock for waiting R/B */
 	cmd = NFC_CMD_RB | NFC_CMD_RB_INT
@@ -1380,6 +1380,7 @@ static int meson_nfc_probe(struct platform_device *pdev)
 
 	nand_controller_init(&nfc->controller);
 	INIT_LIST_HEAD(&nfc->chips);
+	init_completion(&nfc->completion);
 
 	nfc->dev = dev;
 
-- 
2.21.0