NFC: Prevent polling when device is down
authorSamuel Ortiz <sameo@linux.intel.com>
Wed, 10 Apr 2013 10:25:30 +0000 (12:25 +0200)
committerSamuel Ortiz <sameo@linux.intel.com>
Thu, 11 Apr 2013 14:29:10 +0000 (16:29 +0200)
Some devices turn radio on whenever they're asked to start a poll.
To prevent that from happening, we just don't call into the driver
start_poll hook when the NFC device is down.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
net/nfc/core.c

index 6ceee8e181ca9e4f75b1745f22d8e818ebfb1cda..c571ca9a960cfe29b54d5bcac9d8fe524fb33cdd 100644 (file)
@@ -143,6 +143,11 @@ int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
                goto error;
        }
 
+       if (!dev->dev_up) {
+               rc = -ENODEV;
+               goto error;
+       }
+
        if (dev->polling) {
                rc = -EBUSY;
                goto error;