From: madhuparnabhowmik10@gmail.com
To: jacmet@sunsite.dk, gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
ldv-project@linuxtesting.org, andrianov@ispras.ru,
Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Subject: [PATCH] usb/c67x00/c67x00-drv: Fix Data Race bug
Date: Wed, 26 Aug 2020 20:14:59 +0530 [thread overview]
Message-ID: <20200826144459.8245-1-madhuparnabhowmik10@gmail.com> (raw)
From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
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
c67x00_hcd_irq().
Hence, this patch calls c67x00_probe_sie() before requesting IRQ in
probe.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
---
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)
c67x00_ll_init(c67x00);
c67x00_ll_hpi_reg_init(c67x00);
+ 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;
--
2.17.1
next 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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