Date: Mon, 9 Sep 2013 12:45:42 +0000 (UTC) From: Nathan Whitehorn <nwhitehorn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r255416 - head/sys/powerpc/ofw Message-ID: <201309091245.r89CjguR020029@svn.freebsd.org>
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Author: nwhitehorn Date: Mon Sep 9 12:45:41 2013 New Revision: 255416 URL: http://svnweb.freebsd.org/changeset/base/255416 Log: Use a spin lock instead of a mutex to gate RTAS. This is required if RTAS calls are involved in interrupt handling. Approved by: re (kib) Modified: head/sys/powerpc/ofw/rtas.c Modified: head/sys/powerpc/ofw/rtas.c ============================================================================== --- head/sys/powerpc/ofw/rtas.c Mon Sep 9 12:44:48 2013 (r255415) +++ head/sys/powerpc/ofw/rtas.c Mon Sep 9 12:45:41 2013 (r255416) @@ -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 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 __asm __volatile ("sync"); rtas_real_unmap(argsptr, &args, sizeof(args)); - mtx_unlock(&rtas_mtx); + mtx_unlock_spin(&rtas_mtx); if (result < 0) return (result);
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