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Safety check: only try to read a packet if it was preceeded by an interrupt (which sets the pending flag)

This commit is contained in:
adamdunkels 2010-03-19 13:18:53 +00:00
parent 3a5be4a7e4
commit a3a8c0e179
1 changed files with 5 additions and 1 deletions
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6
core/dev/cc2420.c
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@ -28,7 +28,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: cc2420.c,v 1.45 2010/03/16 18:10:09 adamdunkels Exp $ * @(#)$Id: cc2420.c,v 1.46 2010/03/19 13:18:53 adamdunkels Exp $
*/ */
/* /*
* This code is almost device independent and should be easy to port. * This code is almost device independent and should be easy to port.
@ -631,6 +631,10 @@ cc2420_read(void *buf, unsigned short bufsize)
uint16_t checksum; uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */ #endif /* CC2420_CONF_CHECKSUM */
if(!pending) {
return 0;
}
pending = 0; pending = 0;
GET_LOCK(); GET_LOCK();