hwmon: (dell-smm) Cache fan_type() calls and change fan detection

commit 5ce91714b0d8c0a3ff9b858966721f508351cf4c upstream.

On more Dell machines (e.g. Dell Precision M3800) fan_type() call is too
expensive (CPU is too long in SMM mode) and cause kernel to hang. This is
bug in Dell SMM or BIOS.

This patch caches type for each fan (as it should not change) and changes
the way how fan presense is detected. First it try function fan_status()
as was before commit f989e55452c7 ("i8k: Add support for fan labels"). And
if that fails fallback to fan_type(). *_status() functions can fail in case
fan is not currently accessible (e.g. present on GPU which is currently
turned off).

Reported-by: Tolga Cakir <cevelnet@gmail.com>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=112021
Tested-by: Tolga Cakir <cevelnet@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 497efa03d98979a0dd3644e37ff8ee7f005b0845..a9356a3dea926e96b54fae6ed253f1b69aeb0311 100644 (file)
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -237,7 +237,7 @@ static int i8k_get_fan_speed(int fan)
 /*
  * Read the fan type.
  */
-static int i8k_get_fan_type(int fan)
+static int _i8k_get_fan_type(int fan)
 {
        struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
 
@@ -248,6 +248,17 @@ static int i8k_get_fan_type(int fan)
        return i8k_smm(&regs) ? : regs.eax & 0xff;
 }
 
+static int i8k_get_fan_type(int fan)
+{
+       /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
+       static int types[2] = { INT_MIN, INT_MIN };
+
+       if (types[fan] == INT_MIN)
+               types[fan] = _i8k_get_fan_type(fan);
+
+       return types[fan];
+}
+
 /*
  * Read the fan nominal rpm for specific fan speed.
  */
@@ -777,13 +788,17 @@ static int __init i8k_init_hwmon(void)
        if (err >= 0)
                i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
 
-       /* First fan attributes, if fan type is OK */
-       err = i8k_get_fan_type(0);
+       /* First fan attributes, if fan status or type is OK */
+       err = i8k_get_fan_status(0);
+       if (err < 0)
+               err = i8k_get_fan_type(0);
        if (err >= 0)
                i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
 
-       /* Second fan attributes, if fan type is OK */
-       err = i8k_get_fan_type(1);
+       /* Second fan attributes, if fan status or type is OK */
+       err = i8k_get_fan_status(1);
+       if (err < 0)
+               err = i8k_get_fan_type(1);
        if (err >= 0)
                i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;