From 7757dc8a3e7658abb6e5fc7d825a38b27961d0c8 Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Wed, 10 Apr 2013 12:25:30 +0200 Subject: [PATCH] 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 --- net/nfc/core.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/nfc/core.c b/net/nfc/core.c index 6ceee8e181ca..c571ca9a960c 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;