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Use a spin lock instead of a mutex to gate RTAS. This is required if RTAS

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calls are involved in interrupt handling.

Approved by:	re (kib)
This commit is contained in:
Nathan Whitehorn 2013-09-09 12:45:41 +00:00
parent c2f2553784
commit e52f055d23
1 changed files with 3 additions and 3 deletions
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6
sys/powerpc/ofw/rtas.c
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@ -93,7 +93,7 @@ rtas_setup(void *junk)
return;
}
mtx_init(&rtas_mtx, "RTAS", MTX_DEF, 0);
mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);
/* RTAS must be called with everything turned off in MSR */
rtasmsr = mfmsr();
@ -208,7 +208,7 @@ rtas_call_method(cell_t token, int nargs, int nreturns, ...)
args.token = token;
va_start(ap, nreturns);
mtx_lock(&rtas_mtx);
mtx_lock_spin(&rtas_mtx);
rtas_bounce_offset = 0;
args.nargs = nargs;
@ -232,7 +232,7 @@ rtas_call_method(cell_t token, int nargs, int nreturns, ...)
__asm __volatile ("sync");
rtas_real_unmap(argsptr, &args, sizeof(args));
mtx_unlock(&rtas_mtx);
mtx_unlock_spin(&rtas_mtx);
if (result < 0)
return (result);