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| /freebsd-10.1-release/sys/kern/ | ||
| H A D | subr_devstat.c | diff 223061 Mon Jun 13 19:30:07 MDT 2011 gibbs Fix a couple of race conditions in devstat(9) initialization. In devstat_new_entry(), there is no need to initialize the queue and the mutex in this function. There are ways to do static initialization on both, so use STAILQ_HEAD_INITIALIZER and MTX_SYSINIT to initialize the queue and the mutex. In devstat_alloc(), use an atomic test and set routine to guard making our entry in /dev. Using just a plain static variable creates a race condition on multiprocessor machines. If you attempt to create a second entry in devfs, the kernel will panic. Submitted by: kdm Reviewed by: gibbs Sponsored by: Spectra Logic Corporation MFC after: 1 week. |
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