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| author | H. Peter Anvin <hpa@zytor.com> | 2008-08-26 02:27:21 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-08-26 02:45:48 +0200 |
| commit | c6f31932d0a1d2b13952f506ebc92675e2d8df80 (patch) | |
| tree | f08e31afb69ca52e8ba8a1cca316b12bd7bec365 /arch/x86/kernel/msr.c | |
| parent | smp: have smp_call_function_single() detect invalid CPUs (diff) | |
| download | linux-c6f31932d0a1d2b13952f506ebc92675e2d8df80.tar.xz linux-c6f31932d0a1d2b13952f506ebc92675e2d8df80.zip | |
x86: msr: propagate errors from smp_call_function_single()
Propagate error (-ENXIO) from smp_call_function_single(). These
errors can happen when a CPU is unplugged while the MSR driver is
open.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/msr.c')
| -rw-r--r-- | arch/x86/kernel/msr.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c index e43938086885..9c34a1005dba 100644 --- a/arch/x86/kernel/msr.c +++ b/arch/x86/kernel/msr.c @@ -79,8 +79,11 @@ static ssize_t msr_read(struct file *file, char __user *buf, for (; count; count -= 8) { err = rdmsr_safe_on_cpu(cpu, reg, &data[0], &data[1]); - if (err) - return -EIO; + if (err) { + if (err == -EFAULT) /* Fix idiotic error code */ + err = -EIO; + return err; + } if (copy_to_user(tmp, &data, 8)) return -EFAULT; tmp += 2; @@ -105,8 +108,11 @@ static ssize_t msr_write(struct file *file, const char __user *buf, if (copy_from_user(&data, tmp, 8)) return -EFAULT; err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]); - if (err) - return -EIO; + if (err) { + if (err == -EFAULT) /* Fix idiotic error code */ + err = -EIO; + return err; + } tmp += 2; } |