156 lines
3.9 KiB
Diff
156 lines
3.9 KiB
Diff
From d9a056919c4fa46cd9e094f969032bd4e15bffef Mon Sep 17 00:00:00 2001
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From: Ralf Baechle <ralf@linux-mips.org>
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Date: Sat, 28 May 2011 15:27:59 +0100
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Subject: [PATCH] MIPS: Malta: Fix crash SMP kernel on non-CMP systems.
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Since 6be63bbbdab66b9185dc6f67c8b1bacb6f37f946 (lmo) rsp.
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af3a1f6f4813907e143f87030cde67a9971db533 (kernel.org) the Malta code does
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no longer probe for presence of GCMP if CMP is not configured. This means
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that the variable gcmp_present well be left at its default value of -1
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which normally is meant to indicate that GCMP has not yet been mmapped.
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This non-zero value is now interpreted as GCMP being present resulting
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in a write attempt to a GCMP register resulting in a crash.
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Reported and a build fix on top of my fix by Rob Landley <rob@landley.net>.
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Reported-by: Rob Landley <rob@landley.net>
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Patchwork: https://patchwork.linux-mips.org/patch/2413/
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(cherry picked from commit c3ddf592134eaab38d051b2e7b23e81201ae423a)
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---
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arch/mips/include/asm/smp-ops.h | 41 +++++++++++++++++++++++++++--
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arch/mips/mipssim/sim_setup.c | 17 ++++++------
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arch/mips/mti-malta/malta-init.c | 14 +++++-----
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arch/mips/pmc-sierra/msp71xx/msp_setup.c | 8 ++---
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4 files changed, 56 insertions(+), 24 deletions(-)
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--- a/arch/mips/include/asm/smp-ops.h
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+++ b/arch/mips/include/asm/smp-ops.h
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@@ -56,8 +56,43 @@ static inline void register_smp_ops(stru
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#endif /* !CONFIG_SMP */
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-extern struct plat_smp_ops up_smp_ops;
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-extern struct plat_smp_ops cmp_smp_ops;
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-extern struct plat_smp_ops vsmp_smp_ops;
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+static inline int register_up_smp_ops(void)
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+{
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+#ifdef CONFIG_SMP_UP
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+ extern struct plat_smp_ops up_smp_ops;
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+
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+ register_smp_ops(&up_smp_ops);
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+
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+ return 0;
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+#else
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+ return -ENODEV;
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+#endif
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+}
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+
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+static inline int register_cmp_smp_ops(void)
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+{
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+#ifdef CONFIG_MIPS_CMP
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+ extern struct plat_smp_ops cmp_smp_ops;
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+
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+ register_smp_ops(&cmp_smp_ops);
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+
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+ return 0;
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+#else
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+ return -ENODEV;
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+#endif
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+}
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+
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+static inline int register_vsmp_smp_ops(void)
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+{
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+#ifdef CONFIG_MIPS_MT_SMP
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+ extern struct plat_smp_ops vsmp_smp_ops;
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+
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+ register_smp_ops(&vsmp_smp_ops);
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+
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+ return 0;
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+#else
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+ return -ENODEV;
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+#endif
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+}
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#endif /* __ASM_SMP_OPS_H */
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--- a/arch/mips/mipssim/sim_setup.c
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+++ b/arch/mips/mipssim/sim_setup.c
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@@ -59,18 +59,17 @@ void __init prom_init(void)
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prom_meminit();
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-#ifdef CONFIG_MIPS_MT_SMP
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- if (cpu_has_mipsmt)
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- register_smp_ops(&vsmp_smp_ops);
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- else
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- register_smp_ops(&up_smp_ops);
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-#endif
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+ if (cpu_has_mipsmt) {
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+ if (!register_vsmp_smp_ops())
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+ return;
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+
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#ifdef CONFIG_MIPS_MT_SMTC
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- if (cpu_has_mipsmt)
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register_smp_ops(&ssmtc_smp_ops);
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- else
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- register_smp_ops(&up_smp_ops);
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+ return;
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#endif
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+ }
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+
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+ register_up_smp_ops();
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}
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static void __init serial_init(void)
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--- a/arch/mips/mti-malta/malta-init.c
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+++ b/arch/mips/mti-malta/malta-init.c
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@@ -28,6 +28,7 @@
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/cacheflush.h>
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+#include <asm/smp-ops.h>
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#include <asm/traps.h>
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#include <asm/gcmpregs.h>
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@@ -358,15 +359,14 @@ void __init prom_init(void)
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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console_config();
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#endif
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-#ifdef CONFIG_MIPS_CMP
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/* Early detection of CMP support */
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if (gcmp_probe(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ))
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- register_smp_ops(&cmp_smp_ops);
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- else
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-#endif
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-#ifdef CONFIG_MIPS_MT_SMP
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- register_smp_ops(&vsmp_smp_ops);
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-#endif
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+ if (!register_cmp_smp_ops())
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+ return;
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+
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+ if (!register_vsmp_smp_ops())
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+ return;
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+
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#ifdef CONFIG_MIPS_MT_SMTC
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register_smp_ops(&msmtc_smp_ops);
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#endif
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--- a/arch/mips/pmc-sierra/msp71xx/msp_setup.c
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+++ b/arch/mips/pmc-sierra/msp71xx/msp_setup.c
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@@ -228,13 +228,11 @@ void __init prom_init(void)
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*/
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msp_serial_setup();
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-#ifdef CONFIG_MIPS_MT_SMP
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- register_smp_ops(&vsmp_smp_ops);
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-#endif
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-
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+ if (register_vsmp_smp_ops()) {
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#ifdef CONFIG_MIPS_MT_SMTC
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- register_smp_ops(&msp_smtc_smp_ops);
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+ register_smp_ops(&msp_smtc_smp_ops);
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#endif
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+ }
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#ifdef CONFIG_PMCTWILED
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/*
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