diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-18 09:09:09 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-18 09:09:09 -0800 |
| commit | 51d52b26e1d88ce79f1053f1b0f7f4d43a98d26d (patch) | |
| tree | fe0d213a91f49fd4340728a4f5bf34f60e3fba8c /arch/powerpc/xmon/xmon.c | |
| parent | c600558668e4ebd0fab6bf1d90baaf95bc43f9d5 (diff) | |
| parent | 6d0abeca3242a88cab8232e4acd7e2bf088f3bc2 (diff) | |
Merge 3.14-rc3 into tty-next
This is for the fixes in that release, we want them here too.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
| -rw-r--r-- | arch/powerpc/xmon/xmon.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index a90731b3d44a..b07909850f77 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -309,16 +309,23 @@ static void get_output_lock(void) if (xmon_speaker == me) return; + for (;;) { - if (xmon_speaker == 0) { - last_speaker = cmpxchg(&xmon_speaker, 0, me); - if (last_speaker == 0) - return; - } - timeout = 10000000; + last_speaker = cmpxchg(&xmon_speaker, 0, me); + if (last_speaker == 0) + return; + + /* + * Wait a full second for the lock, we might be on a slow + * console, but check every 100us. + */ + timeout = 10000; while (xmon_speaker == last_speaker) { - if (--timeout > 0) + if (--timeout > 0) { + udelay(100); continue; + } + /* hostile takeover */ prev = cmpxchg(&xmon_speaker, last_speaker, me); if (prev == last_speaker) @@ -397,7 +404,6 @@ static int xmon_core(struct pt_regs *regs, int fromipi) } xmon_fault_jmp[cpu] = recurse_jmp; - cpumask_set_cpu(cpu, &cpus_in_xmon); bp = NULL; if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) @@ -419,6 +425,8 @@ static int xmon_core(struct pt_regs *regs, int fromipi) release_output_lock(); } + cpumask_set_cpu(cpu, &cpus_in_xmon); + waiting: secondary = 1; while (secondary && !xmon_gate) { |