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From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Oliver Neukum <oneukum@suse.com>,
	Valentin Vidic <vvidic@valentin-vidic.from.hr>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	Johan Hovold <johan@kernel.org>
Subject: [PATCH 5/6] USB: iowarrior: drop redundant iowarrior mutex
Date: Wed,  9 Oct 2019 12:48:45 +0200
Message-ID: <20191009104846.5925-6-johan@kernel.org> (raw)
In-Reply-To: <20191009104846.5925-1-johan@kernel.org>

Drop the redundant iowarrior mutex introduced by commit 925ce689bb31
("USB: autoconvert trivial BKL users to private mutex") which replaced
an earlier BKL use.

The lock serialised calls to open() against other open() and ioctl(),
but neither is needed.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/misc/iowarrior.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index d844c2098e42..ad29ef51e53f 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -54,9 +54,6 @@ MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 
-/* Module parameters */
-static DEFINE_MUTEX(iowarrior_mutex);
-
 static struct usb_driver iowarrior_driver;
 
 /*--------------*/
@@ -480,8 +477,6 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
 	if (!buffer)
 		return -ENOMEM;
 
-	/* lock this object */
-	mutex_lock(&iowarrior_mutex);
 	mutex_lock(&dev->mutex);
 
 	/* verify that the device wasn't unplugged */
@@ -574,7 +569,6 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
 error_out:
 	/* unlock the device */
 	mutex_unlock(&dev->mutex);
-	mutex_unlock(&iowarrior_mutex);
 	kfree(buffer);
 	return retval;
 }
@@ -589,22 +583,18 @@ static int iowarrior_open(struct inode *inode, struct file *file)
 	int subminor;
 	int retval = 0;
 
-	mutex_lock(&iowarrior_mutex);
 	subminor = iminor(inode);
 
 	interface = usb_find_interface(&iowarrior_driver, subminor);
 	if (!interface) {
-		mutex_unlock(&iowarrior_mutex);
 		printk(KERN_ERR "%s - error, can't find device for minor %d\n",
 		       __func__, subminor);
 		return -ENODEV;
 	}
 
 	dev = usb_get_intfdata(interface);
-	if (!dev) {
-		mutex_unlock(&iowarrior_mutex);
+	if (!dev)
 		return -ENODEV;
-	}
 
 	mutex_lock(&dev->mutex);
 
@@ -628,7 +618,6 @@ static int iowarrior_open(struct inode *inode, struct file *file)
 
 out:
 	mutex_unlock(&dev->mutex);
-	mutex_unlock(&iowarrior_mutex);
 	return retval;
 }
 
-- 
2.23.0


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 10:48 [PATCH 0/6] USB: iowarrior: disconnect fixes and locking cleanups Johan Hovold
2019-10-09 10:48 ` [PATCH 1/6] USB: iowarrior: fix use-after-free on disconnect Johan Hovold
2019-10-09 10:48 ` [PATCH 2/6] USB: iowarrior: fix use-after-free on release Johan Hovold
2019-10-09 10:48 ` [PATCH 3/6] USB: iowarrior: fix use-after-free after driver unbind Johan Hovold
2019-10-09 10:48 ` [PATCH 4/6] USB: iowarrior: drop redundant disconnect mutex Johan Hovold
2019-10-09 10:48 ` Johan Hovold [this message]
2019-10-09 10:48 ` [PATCH 6/6] USB: iowarrior: use pr_err() Johan Hovold
2019-10-10 10:45 ` [PATCH 0/6] USB: iowarrior: disconnect fixes and locking cleanups Greg Kroah-Hartman

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