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NFC: Prevent polling when device is down
author
Samuel Ortiz
<sameo@linux.intel.com>
Wed, 10 Apr 2013 10:25:30 +0000
(12:25 +0200)
committer
Samuel 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
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diff --git
a/net/nfc/core.c
b/net/nfc/core.c
index
6ceee8e
..
c571ca9
100644
(file)
--- 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;