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authorAlan Stern <stern@rowland.harvard.edu>2006-07-02 06:06:36 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-27 22:58:49 +0400
commit121e287cb554f3d3402c85a1950d852691b08f5c (patch)
treefa05e0d622e5f3d339004c4708223a24088ee574 /drivers/usb/usb-skeleton.c
parent349710c3a79c0405911b8b604953f0c665e17756 (diff)
downloadlinux-121e287cb554f3d3402c85a1950d852691b08f5c.tar.xz
usb-skeleton: don't submit URBs after disconnection
This patch (as712b) is a slight revision of one submitted earlier. It fixes the usb-skeleton example driver so that it won't try to submit URBs after skel_disconnect() has returned. This could cause errors, if the driver was unbound and then a different driver was bound to the device. It also fixes a couple of small bugs in the skel_write() routine. The revised patch uses a slightly different test, suggested by Dave Brownell, for determining whether to free a transfer buffer. It's a little clearer than the earlier version. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/usb-skeleton.c')
-rw-r--r--drivers/usb/usb-skeleton.c40
1 files changed, 33 insertions, 7 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index b362039792b3..33f0e81c58d3 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -1,5 +1,5 @@
/*
- * USB Skeleton driver - 2.0
+ * USB Skeleton driver - 2.1
*
* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
*
@@ -8,8 +8,7 @@
* published by the Free Software Foundation, version 2.
*
* This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
- * but has been rewritten to be easy to read and use, as no locks are now
- * needed anymore.
+ * but has been rewritten to be easier to read and use.
*
*/
@@ -21,6 +20,7 @@
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
+#include <linux/mutex.h>
/* Define these values to match your devices */
@@ -52,6 +52,7 @@ struct usb_skel {
__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
struct kref kref;
+ struct mutex io_mutex; /* synchronize I/O with disconnect */
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
@@ -119,7 +120,13 @@ static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *
int bytes_read;
dev = (struct usb_skel *)file->private_data;
-
+
+ mutex_lock(&dev->io_mutex);
+ if (!dev->interface) { /* disconnect() was called */
+ retval = -ENODEV;
+ goto exit;
+ }
+
/* do a blocking bulk read to get data from the device */
retval = usb_bulk_msg(dev->udev,
usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
@@ -135,6 +142,8 @@ static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *
retval = bytes_read;
}
+exit:
+ mutex_unlock(&dev->io_mutex);
return retval;
}
@@ -179,6 +188,12 @@ static ssize_t skel_write(struct file *file, const char *user_buffer, size_t cou
goto exit;
}
+ mutex_lock(&dev->io_mutex);
+ if (!dev->interface) { /* disconnect() was called */
+ retval = -ENODEV;
+ goto error;
+ }
+
/* create a urb, and a buffer for it, and copy the data to the urb */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
@@ -213,13 +228,18 @@ static ssize_t skel_write(struct file *file, const char *user_buffer, size_t cou
/* release our reference to this urb, the USB core will eventually free it entirely */
usb_free_urb(urb);
-exit:
+ mutex_unlock(&dev->io_mutex);
return writesize;
error:
- usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
- usb_free_urb(urb);
+ if (urb) {
+ usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
+ usb_free_urb(urb);
+ }
+ mutex_unlock(&dev->io_mutex);
up(&dev->limit_sem);
+
+exit:
return retval;
}
@@ -258,6 +278,7 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
}
kref_init(&dev->kref);
sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
+ mutex_init(&dev->io_mutex);
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
@@ -334,6 +355,11 @@ static void skel_disconnect(struct usb_interface *interface)
/* give back our minor */
usb_deregister_dev(interface, &skel_class);
+ /* prevent more I/O from starting */
+ mutex_lock(&dev->io_mutex);
+ dev->interface = NULL;
+ mutex_unlock(&dev->io_mutex);
+
unlock_kernel();
/* decrement our usage count */