diff options
| author | Ed Nash <enash54@gmail.com> | 2013-07-31 12:11:03 -0400 |
|---|---|---|
| committer | Anthony Felice <tony.felice@timesys.com> | 2013-10-09 12:56:47 -0400 |
| commit | 36a372c590f975825e255b66270370981c51c001 (patch) | |
| tree | 874459b08434dccae2f8a1e9f57b688517ffb924 | |
| parent | 0cb2d0cc735bd784927a0579d7be9f7abc14e0fe (diff) | |
add a test call to determine state of semaphore without requesting it
| -rw-r--r-- | arch/arm/mach-mvf/mvf_sema4.c | 10 | ||||
| -rw-r--r-- | include/linux/mvf_sema4.h | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/mach-mvf/mvf_sema4.c b/arch/arm/mach-mvf/mvf_sema4.c index 31e40f6d02f0..4521d124f1b7 100644 --- a/arch/arm/mach-mvf/mvf_sema4.c +++ b/arch/arm/mach-mvf/mvf_sema4.c @@ -286,3 +286,13 @@ int mvf_sema4_unlock(MVF_SEMA4 *sema4) } EXPORT_SYMBOL(mvf_sema4_unlock); +// return 0 on success (meaning it is set to us) +int mvf_sema4_test(MVF_SEMA4 *sema4) +{ + if(!sema4) + return -EINVAL; + + return (readb(MVF_IO_ADDRESS(MVF_SEMA4_BASE_ADDR) + sema4->gate_num)) == LOCK_VALUE ? 0 : 1; +} +EXPORT_SYMBOL(mvf_sema4_test); + diff --git a/include/linux/mvf_sema4.h b/include/linux/mvf_sema4.h index aa2379a9de05..198f3f249ec5 100644 --- a/include/linux/mvf_sema4.h +++ b/include/linux/mvf_sema4.h @@ -25,5 +25,6 @@ int mvf_sema4_assign(int gate_num, MVF_SEMA4** sema4_p); int mvf_sema4_deassign(MVF_SEMA4 *sema4); int mvf_sema4_lock(MVF_SEMA4 *sema4, unsigned int timeout_us, bool use_interrupts); int mvf_sema4_unlock(MVF_SEMA4 *sema4); +int mvf_sema4_test(MVF_SEMA4 *sema4); #endif |