linux-kernel - [PATCH] staging/rts5208/rtsx: Improve unlocking of a mutex in rtsx

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Date:   Fri, 3 Nov 2017 20:10:17 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     devel@...verdev.osuosl.org,
        Colin Ian King <colin.king@...onical.com>,
        Gaurav Pathak <gauravpathak129@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hannes Reinecke <hare@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] staging/rts5208/rtsx: Improve unlocking of a mutex in
 rtsx_resume()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 3 Nov 2017 20:02:22 +0100

* Add a jump target so that a call of the function "mutex_unlock" is stored
  only twice in this function implementation.

* Replace two calls by goto statements.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/staging/rts5208/rtsx.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/rts5208/rtsx.c b/drivers/staging/rts5208/rtsx.c
index 89e2cfe7d1cc..14022a76ecfb 100644
--- a/drivers/staging/rts5208/rtsx.c
+++ b/drivers/staging/rts5208/rtsx.c
@@ -349,9 +349,7 @@ static int rtsx_resume(struct pci_dev *pci)
 		dev_err(&dev->pci->dev,
 			"%s: pci_enable_device failed, disabling device\n",
 			CR_DRIVER_NAME);
-		/* unlock the device pointers */
-		mutex_unlock(&dev->dev_mutex);
-		return -EIO;
+		goto unlock;
 	}
 	pci_set_master(pci);
 
@@ -360,11 +358,8 @@ static int rtsx_resume(struct pci_dev *pci)
 			chip->msi_en = 0;
 	}
 
-	if (rtsx_acquire_irq(dev) < 0) {
-		/* unlock the device pointers */
-		mutex_unlock(&dev->dev_mutex);
-		return -EIO;
-	}
+	if (rtsx_acquire_irq(dev) < 0)
+		goto unlock;
 
 	rtsx_write_register(chip, HOST_SLEEP_STATE, 0x03, 0x00);
 	rtsx_init_chip(chip);
@@ -373,6 +368,10 @@ static int rtsx_resume(struct pci_dev *pci)
 	mutex_unlock(&dev->dev_mutex);
 
 	return 0;
+
+unlock:
+	mutex_unlock(&dev->dev_mutex);
+	return -EIO;
 }
 #endif /* CONFIG_PM */
 
-- 
2.15.0