ALSA: line6: Fix POD sysfs attributes segfault

The commit 02fc76f6a changed base of the sysfs attributes from device to card.
The "show" callbacks dereferenced wrong objects because of this.

Fixes: 02fc76f6a7db ('ALSA: line6: Create sysfs via snd_card_add_dev_attr()')
Cc: <stable@vger.kernel.org> # v4.0+
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Andrej Krutak <dev@andree.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/line6/pod.c b/sound/usb/line6/pod.c
index daf81d169a42043f265a48df58afcc5490d40f97..45dd34874f43a7f00fc481b25d7b5bf80ffb6c02 100644 (file)
--- a/sound/usb/line6/pod.c
+++ b/sound/usb/line6/pod.c
@@ -244,8 +244,8 @@ static int pod_set_system_param_int(struct usb_line6_pod *pod, int value,
 static ssize_t serial_number_show(struct device *dev,
                                  struct device_attribute *attr, char *buf)
 {
-       struct usb_interface *interface = to_usb_interface(dev);
-       struct usb_line6_pod *pod = usb_get_intfdata(interface);
+       struct snd_card *card = dev_to_snd_card(dev);
+       struct usb_line6_pod *pod = card->private_data;
 
        return sprintf(buf, "%u\n", pod->serial_number);
 }
@@ -256,8 +256,8 @@ static ssize_t serial_number_show(struct device *dev,
 static ssize_t firmware_version_show(struct device *dev,
                                     struct device_attribute *attr, char *buf)
 {
-       struct usb_interface *interface = to_usb_interface(dev);
-       struct usb_line6_pod *pod = usb_get_intfdata(interface);
+       struct snd_card *card = dev_to_snd_card(dev);
+       struct usb_line6_pod *pod = card->private_data;
 
        return sprintf(buf, "%d.%02d\n", pod->firmware_version / 100,
                       pod->firmware_version % 100);
@@ -269,8 +269,8 @@ static ssize_t firmware_version_show(struct device *dev,
 static ssize_t device_id_show(struct device *dev,
                              struct device_attribute *attr, char *buf)
 {
-       struct usb_interface *interface = to_usb_interface(dev);
-       struct usb_line6_pod *pod = usb_get_intfdata(interface);
+       struct snd_card *card = dev_to_snd_card(dev);
+       struct usb_line6_pod *pod = card->private_data;
 
        return sprintf(buf, "%d\n", pod->device_id);
 }