If you support only one device, you need to roll back
back your counter in all cases if probe() fails.
That cannot be left to usb_pcwd_delete() because
that must be called conditionally.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Oliver Neukum <[email protected]>
---
drivers/watchdog/pcwd_usb.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
index 8202f0a6b093..3a22291d633b 100644
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -606,7 +606,7 @@ static int usb_pcwd_probe(struct usb_interface *interface,
struct usb_endpoint_descriptor *endpoint;
struct usb_pcwd_private *usb_pcwd = NULL;
int pipe;
- int retval = -ENOMEM;
+ int retval = -ENODEV;
int got_fw_rev;
unsigned char fw_rev_major, fw_rev_minor;
char fw_ver_str[20];
@@ -615,7 +615,7 @@ static int usb_pcwd_probe(struct usb_interface *interface,
cards_found++;
if (cards_found > 1) {
pr_err("This driver only supports 1 device\n");
- return -ENODEV;
+ goto error_count;
}
/* get the active interface descriptor */
@@ -624,11 +624,12 @@ static int usb_pcwd_probe(struct usb_interface *interface,
/* check out that we have a HID device */
if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
pr_err("The device isn't a Human Interface Device\n");
- return -ENODEV;
+ goto error_count;
}
if (iface_desc->desc.bNumEndpoints < 1)
- return -ENODEV;
+ goto error_count;
+
/* check out the endpoint: it has to be Interrupt & IN */
endpoint = &iface_desc->endpoint[0].desc;
@@ -636,16 +637,17 @@ static int usb_pcwd_probe(struct usb_interface *interface,
if (!usb_endpoint_is_int_in(endpoint)) {
/* we didn't find a Interrupt endpoint with direction IN */
pr_err("Couldn't find an INTR & IN endpoint\n");
- return -ENODEV;
+ goto error_count;
}
/* get a handle to the interrupt data pipe */
pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
/* allocate memory for our device and initialize it */
+ retval = -ENOMEM;
usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
if (usb_pcwd == NULL)
- goto error;
+ goto error_count;
usb_pcwd_device = usb_pcwd;
@@ -661,13 +663,13 @@ static int usb_pcwd_probe(struct usb_interface *interface,
GFP_KERNEL, &usb_pcwd->intr_dma);
if (!usb_pcwd->intr_buffer) {
pr_err("Out of memory\n");
- goto error;
+ goto error_delete;
}
/* allocate the urb's */
usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!usb_pcwd->intr_urb)
- goto error;
+ goto error_delete;
/* initialise the intr urb's */
usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
@@ -680,7 +682,7 @@ static int usb_pcwd_probe(struct usb_interface *interface,
if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
pr_err("Problem registering interrupt URB\n");
retval = -EIO; /* failure */
- goto error;
+ goto error_delete;
}
/* The device exists and can be communicated with */
@@ -723,7 +725,7 @@ static int usb_pcwd_probe(struct usb_interface *interface,
retval = register_reboot_notifier(&usb_pcwd_notifier);
if (retval != 0) {
pr_err("cannot register reboot notifier (err=%d)\n", retval);
- goto error;
+ goto error_delete;
}
retval = misc_register(&usb_pcwd_temperature_miscdev);
@@ -752,10 +754,12 @@ static int usb_pcwd_probe(struct usb_interface *interface,
misc_deregister(&usb_pcwd_temperature_miscdev);
err_out_unregister_reboot:
unregister_reboot_notifier(&usb_pcwd_notifier);
-error:
+error_delete:
if (usb_pcwd)
usb_pcwd_delete(usb_pcwd);
usb_pcwd_device = NULL;
+error_count:
+ cards_found--;
return retval;
}
--
2.40.0