From: Samuel Ortiz <sameo@linux.intel.com>
Date: Wed, 10 Apr 2013 10:25:30 +0000 (+0200)
Subject: NFC: Prevent polling when device is down
X-Git-Tag: v3.12-rc1~804^2~21^2^2~82^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7757dc8a3e7658abb6e5fc7d825a38b27961d0c8;p=kernel%2Fkernel-generic.git

NFC: Prevent polling when device is down

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>
---

diff --git a/net/nfc/core.c b/net/nfc/core.c
index 6ceee8e..c571ca9 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -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;