Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6

* 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6: (32 commits)
  Use menuconfig objects - hwmon
  hwmon/smsc47b397: Use dynamic sysfs callbacks
  hwmon/smsc47b397: Convert to a platform driver
  hwmon/w83781d: Deprecate W83627HF support
  hwmon/w83781d: Use dynamic sysfs callbacks
  hwmon/w83781d: Be less i2c_client-centric
  hwmon/w83781d: Clean up conversion macros
  hwmon/w83781d: No longer use i2c-isa
  hwmon/ams: Do not print error on systems without apple motion sensor
  hwmon/ams: Fix I2C read retry logic
  hwmon: New AD7416, AD7417 and AD7418 driver
  hwmon/coretemp: Add documentation
  hwmon: New coretemp driver
  i386: Use functions from library in msr driver
  i386: Add safe variants of rdmsr_on_cpu and wrmsr_on_cpu
  hwmon/lm75: Use dynamic sysfs callbacks
  hwmon/lm78: Use dynamic sysfs callbacks
  hwmon/lm78: Be less i2c_client-centric
  hwmon/lm78: No longer use i2c-isa
  hwmon: New max6650 driver
  ...

2 files changed, 71 insertions, 108 deletions

diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c
index bcaa6e9b619..8cd0a91ce10 100644
--- a/arch/i386/kernel/msr.c
+++ b/arch/i386/kernel/msr.c
@@ -45,104 +45,6 @@
 
 static struct class *msr_class;
 
-static inline int wrmsr_eio(u32 reg, u32 eax, u32 edx)
-{
-	int err;
-
-	err = wrmsr_safe(reg, eax, edx);
-	if (err)
-		err = -EIO;
-	return err;
-}
-
-static inline int rdmsr_eio(u32 reg, u32 *eax, u32 *edx)
-{
-	int err;
-
-	err = rdmsr_safe(reg, eax, edx);
-	if (err)
-		err = -EIO;
-	return err;
-}
-
-#ifdef CONFIG_SMP
-
-struct msr_command {
-	int err;
-	u32 reg;
-	u32 data[2];
-};
-
-static void msr_smp_wrmsr(void *cmd_block)
-{
-	struct msr_command *cmd = (struct msr_command *)cmd_block;
-
-	cmd->err = wrmsr_eio(cmd->reg, cmd->data[0], cmd->data[1]);
-}
-
-static void msr_smp_rdmsr(void *cmd_block)
-{
-	struct msr_command *cmd = (struct msr_command *)cmd_block;
-
-	cmd->err = rdmsr_eio(cmd->reg, &cmd->data[0], &cmd->data[1]);
-}
-
-static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
-{
-	struct msr_command cmd;
-	int ret;
-
-	preempt_disable();
-	if (cpu == smp_processor_id()) {
-		ret = wrmsr_eio(reg, eax, edx);
-	} else {
-		cmd.reg = reg;
-		cmd.data[0] = eax;
-		cmd.data[1] = edx;
-
-		smp_call_function_single(cpu, msr_smp_wrmsr, &cmd, 1, 1);
-		ret = cmd.err;
-	}
-	preempt_enable();
-	return ret;
-}
-
-static inline int do_rdmsr(int cpu, u32 reg, u32 * eax, u32 * edx)
-{
-	struct msr_command cmd;
-	int ret;
-
-	preempt_disable();
-	if (cpu == smp_processor_id()) {
-		ret = rdmsr_eio(reg, eax, edx);
-	} else {
-		cmd.reg = reg;
-
-		smp_call_function_single(cpu, msr_smp_rdmsr, &cmd, 1, 1);
-
-		*eax = cmd.data[0];
-		*edx = cmd.data[1];
-
-		ret = cmd.err;
-	}
-	preempt_enable();
-	return ret;
-}
-
-#else				/* ! CONFIG_SMP */
-
-static inline int do_wrmsr(int cpu, u32 reg, u32 eax, u32 edx)
-{
-	return wrmsr_eio(reg, eax, edx);
-}
-
-static inline int do_rdmsr(int cpu, u32 reg, u32 *eax, u32 *edx)
-{
-	return rdmsr_eio(reg, eax, edx);
-}
-
-#endif				/* ! CONFIG_SMP */
-
 static loff_t msr_seek(struct file *file, loff_t offset, int orig)
 {
 	loff_t ret = -EINVAL;
@@ -174,9 +76,9 @@ static ssize_t msr_read(struct file *file, char __user * buf,
 		return -EINVAL;	/* Invalid chunk size */
 
 	for (; count; count -= 8) {
-		err = do_rdmsr(cpu, reg, &data[0], &data[1]);
+		err = rdmsr_safe_on_cpu(cpu, reg, &data[0], &data[1]);
 		if (err)
-			return err;
+			return -EIO;
 		if (copy_to_user(tmp, &data, 8))
 			return -EFAULT;
 		tmp += 2;
@@ -200,9 +102,9 @@ static ssize_t msr_write(struct file *file, const char __user *buf,
 	for (; count; count -= 8) {
 		if (copy_from_user(&data, tmp, 8))
 			return -EFAULT;
-		err = do_wrmsr(cpu, reg, data[0], data[1]);
+		err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]);
 		if (err)
-			return err;
+			return -EIO;
 		tmp += 2;
 	}
 
diff --git a/arch/i386/lib/msr-on-cpu.c b/arch/i386/lib/msr-on-cpu.c
index 1c46bda409f..7767962f25d 100644
--- a/arch/i386/lib/msr-on-cpu.c
+++ b/arch/i386/lib/msr-on-cpu.c
@@ -6,6 +6,7 @@
 struct msr_info {
 	u32 msr_no;
 	u32 l, h;
+	int err;
 };
 
 static void __rdmsr_on_cpu(void *info)
@@ -15,20 +16,38 @@ static void __rdmsr_on_cpu(void *info)
 	rdmsr(rv->msr_no, rv->l, rv->h);
 }
 
-void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+static void __rdmsr_safe_on_cpu(void *info)
 {
+	struct msr_info *rv = info;
+
+	rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
+}
+
+static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe)
+{
+	int err = 0;
 	preempt_disable();
 	if (smp_processor_id() == cpu)
-		rdmsr(msr_no, *l, *h);
+		if (safe)
+			err = rdmsr_safe(msr_no, l, h);
+		else
+			rdmsr(msr_no, *l, *h);
 	else {
 		struct msr_info rv;
 
 		rv.msr_no = msr_no;
-		smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+		if (safe) {
+			smp_call_function_single(cpu, __rdmsr_safe_on_cpu,
+						 &rv, 0, 1);
+			err = rv.err;
+		} else {
+			smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
+		}
 		*l = rv.l;
 		*h = rv.h;
 	}
 	preempt_enable();
+	return err;
 }
 
 static void __wrmsr_on_cpu(void *info)
@@ -38,21 +57,63 @@ static void __wrmsr_on_cpu(void *info)
 	wrmsr(rv->msr_no, rv->l, rv->h);
 }
 
-void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+static void __wrmsr_safe_on_cpu(void *info)
 {
+	struct msr_info *rv = info;
+
+	rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
+}
+
+static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe)
+{
+	int err = 0;
 	preempt_disable();
 	if (smp_processor_id() == cpu)
-		wrmsr(msr_no, l, h);
+		if (safe)
+			err = wrmsr_safe(msr_no, l, h);
+		else
+			wrmsr(msr_no, l, h);
 	else {
 		struct msr_info rv;
 
 		rv.msr_no = msr_no;
 		rv.l = l;
 		rv.h = h;
-		smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+		if (safe) {
+			smp_call_function_single(cpu, __wrmsr_safe_on_cpu,
+						 &rv, 0, 1);
+			err = rv.err;
+		} else {
+			smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
+		}
 	}
 	preempt_enable();
+	return err;
+}
+
+void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+	_wrmsr_on_cpu(cpu, msr_no, l, h, 0);
+}
+
+void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+	_rdmsr_on_cpu(cpu, msr_no, l, h, 0);
+}
+
+/* These "safe" variants are slower and should be used when the target MSR
+   may not actually exist. */
+int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
+{
+	return _wrmsr_on_cpu(cpu, msr_no, l, h, 1);
+}
+
+int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
+{
+	return _rdmsr_on_cpu(cpu, msr_no, l, h, 1);
 }
 
 EXPORT_SYMBOL(rdmsr_on_cpu);
 EXPORT_SYMBOL(wrmsr_on_cpu);
+EXPORT_SYMBOL(rdmsr_safe_on_cpu);
+EXPORT_SYMBOL(wrmsr_safe_on_cpu);