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| author | H. Peter Anvin <hpa@zytor.com> | 2008-08-25 22:45:37 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-08-25 22:45:37 -0700 |
| commit | 94d4ac2f4a58c6e37876827c6688c61cef21290c (patch) | |
| tree | 732f4e4794f3c116041242f69754637f75c0dd57 /arch/x86/kernel/cpuid.c | |
| parent | ed21763e7b0b3fb50e4efd9d4bc17ef5b035d304 (diff) | |
| parent | 08970fc4e0385790a7b093adfaa4165a189f9eb0 (diff) | |
Merge branch 'x86/urgent' into x86/cleanups
Diffstat (limited to 'arch/x86/kernel/cpuid.c')
| -rw-r--r-- | arch/x86/kernel/cpuid.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c index 3fa4e926b51..6a44d646599 100644 --- a/arch/x86/kernel/cpuid.c +++ b/arch/x86/kernel/cpuid.c @@ -88,6 +88,8 @@ 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; + ssize_t bytes = 0; + int err = 0; if (count % 16) return -EINVAL; /* Invalid chunk size */ @@ -95,14 +97,19 @@ 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); - if (copy_to_user(tmp, &cmd, 16)) - return -EFAULT; + err = smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1); + if (err) + break; + if (copy_to_user(tmp, &cmd, 16)) { + err = -EFAULT; + break; + } tmp += 16; + bytes += 16; *ppos = ++pos; } - return tmp - buf; + return bytes ? bytes : err; } static int cpuid_open(struct inode *inode, struct file *file) |