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| author | H. Peter Anvin <hpa@zytor.com> | 2008-08-25 17:28:20 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-08-25 17:45:48 -0700 |
| commit | 4b46ca701bdcdc19fcf32823f9fcabf8236e4e78 (patch) | |
| tree | b32c91552aa74f55381d591bc3a6787164899ac7 /arch/x86/kernel/cpuid.c | |
| parent | c6f31932d0a1d2b13952f506ebc92675e2d8df80 (diff) | |
| download | op-kernel-dev-4b46ca701bdcdc19fcf32823f9fcabf8236e4e78.zip op-kernel-dev-4b46ca701bdcdc19fcf32823f9fcabf8236e4e78.tar.gz | |
x86: cpuid: propagate error from smp_call_function_single()
Propagate error (-ENXIO) from smp_call_function_single() in the CPUID
driver. This can happen when a CPU is unplugged while the CPUID
driver is open.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/cpuid.c')
| -rw-r--r-- | arch/x86/kernel/cpuid.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c index 14b11b3..23e8316 100644 --- a/arch/x86/kernel/cpuid.c +++ b/arch/x86/kernel/cpuid.c @@ -89,6 +89,7 @@ static ssize_t cpuid_read(struct file *file, char __user *buf, struct cpuid_regs cmd; int cpu = iminor(file->f_path.dentry->d_inode); u64 pos = *ppos; + int err; if (count % 16) return -EINVAL; /* Invalid chunk size */ @@ -96,7 +97,9 @@ static ssize_t cpuid_read(struct file *file, char __user *buf, for (; count; count -= 16) { cmd.eax = pos; cmd.ecx = pos >> 32; - smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1); + err = smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1); + if (err) + return err; if (copy_to_user(tmp, &cmd, 16)) return -EFAULT; tmp += 16; |
