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	Madhuparna Bhowmik <>
Subject: [PATCH] usb/c67x00/c67x00-drv: Fix Data Race bug
Date: Wed, 26 Aug 2020 20:14:59 +0530	[thread overview]
Message-ID: <> (raw)

From: Madhuparna Bhowmik <>

Currently in c67x00_drv_probe() IRQ is requested before calling
c67x00_probe_sie() and hence if interrupt happens the reading of certain
variables in the handler can race with initialization of the variables,
for e.g. sie->sie_num is written in c67x00_probe_sie() and read in
Hence, this patch calls c67x00_probe_sie() before requesting IRQ in

Found by Linux Driver Verification project (

Signed-off-by: Madhuparna Bhowmik <>
 drivers/usb/c67x00/c67x00-drv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/c67x00/c67x00-drv.c b/drivers/usb/c67x00/c67x00-drv.c
index 53838e7d4eef..2e816d5ca0eb 100644
--- a/drivers/usb/c67x00/c67x00-drv.c
+++ b/drivers/usb/c67x00/c67x00-drv.c
@@ -146,6 +146,9 @@ static int c67x00_drv_probe(struct platform_device *pdev)
+	for (i = 0; i < C67X00_SIES; i++)
+		c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
 	ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
 	if (ret) {
 		dev_err(&pdev->dev, "Cannot claim IRQ\n");
@@ -158,9 +161,6 @@ static int c67x00_drv_probe(struct platform_device *pdev)
 		goto reset_failed;
-	for (i = 0; i < C67X00_SIES; i++)
-		c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
 	platform_set_drvdata(pdev, c67x00);
 	return 0;

             reply	other threads:[~2020-08-26 14:45 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-26 14:44 madhuparnabhowmik10 [this message]
2020-08-28  7:40 ` [PATCH] usb/c67x00/c67x00-drv: Fix Data Race bug Greg KH
2020-08-28 16:19   ` Madhuparna Bhowmik

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