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authorNishanth Menon <nm@ti.com>2014-12-04 10:58:47 -0600
committerGuenter Roeck <linux@roeck-us.net>2014-12-04 11:04:11 -0800
commit52a95c1185220feb514c8e167bd6033c0da6f576 (patch)
tree1a9c3451b98a19d4f472537d798f3f31f39ff7b8 /drivers/hwmon
parent90652efeba1a05300931b3fad53540b9bca73948 (diff)
downloadlinux-52a95c1185220feb514c8e167bd6033c0da6f576.tar.bz2
hwmon: (gpio-fan) Allow usage of gpio operations that may sleep
Certain I2C based GPIO expanders could be used in sleepable context, this results in: [ 115.890569] ------------[ cut here ]------------ [ 115.895422] WARNING: CPU: 0 PID: 1115 at drivers/gpio/gpiolib.c:1370 gpiod_set_raw_value+0x40/0x4c() [ 115.905024] Modules linked in: [ 115.908229] CPU: 0 PID: 1115 Comm: sh Tainted: G W 3.18.0-rc7-next-20141203-dirty #1 [ 115.917461] Hardware name: Generic DRA74X (Flattened Device Tree) [ 115.923876] [<c0015368>] (unwind_backtrace) from [<c00119f4>] (show_stack+0x10/0x14) [ 115.932013] [<c00119f4>] (show_stack) from [<c05b78e8>] (dump_stack+0x78/0x94) [ 115.939594] [<c05b78e8>] (dump_stack) from [<c003de28>] (warn_slowpath_common+0x7c/0xb4) [ 115.948094] [<c003de28>] (warn_slowpath_common) from [<c003de7c>] (warn_slowpath_null+0x1c/0x24) [ 115.957315] [<c003de7c>] (warn_slowpath_null) from [<c03461e8>] (gpiod_set_raw_value+0x40/0x4c) [ 115.966457] [<c03461e8>] (gpiod_set_raw_value) from [<c04866f4>] (set_fan_speed+0x4c/0x64) [ 115.975145] [<c04866f4>] (set_fan_speed) from [<c04868a8>] (set_rpm+0x98/0xac) [ 115.982742] [<c04868a8>] (set_rpm) from [<c039fb4c>] (dev_attr_store+0x18/0x24) [ 115.990426] [<c039fb4c>] (dev_attr_store) from [<c01b0a28>] (sysfs_kf_write+0x4c/0x50) [ 115.998742] [<c01b0a28>] (sysfs_kf_write) from [<c01afe1c>] (kernfs_fop_write+0xbc/0x19c) [ 116.007333] [<c01afe1c>] (kernfs_fop_write) from [<c0148cc4>] (vfs_write+0xb0/0x1a0) [ 116.015461] [<c0148cc4>] (vfs_write) from [<c0148fbc>] (SyS_write+0x44/0x84) [ 116.022881] [<c0148fbc>] (SyS_write) from [<c000e5c0>] (ret_fast_syscall+0x0/0x48) [ 116.030833] ---[ end trace 3a0b636123acab82 ]--- So, switch over to sleepable GPIO operations as there is no mandatory need for non-sleepable gpio operations in the fan driver. This allows the fan driver to be used with i2c based gpio expanders such as palmas_gpio. Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/gpio-fan.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 4efa1734bdad..7802eb2a442f 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -79,7 +79,7 @@ static ssize_t show_fan_alarm(struct device *dev,
{
struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
struct gpio_fan_alarm *alarm = fan_data->alarm;
- int value = gpio_get_value(alarm->gpio);
+ int value = gpio_get_value_cansleep(alarm->gpio);
if (alarm->active_low)
value = !value;
@@ -131,7 +131,7 @@ static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
int i;
for (i = 0; i < fan_data->num_ctrl; i++)
- gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
+ gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1);
}
static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
@@ -142,7 +142,7 @@ static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
for (i = 0; i < fan_data->num_ctrl; i++) {
int value;
- value = gpio_get_value(fan_data->ctrl[i]);
+ value = gpio_get_value_cansleep(fan_data->ctrl[i]);
ctrl_val |= (value << i);
}
return ctrl_val;
@@ -369,7 +369,8 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
if (err)
return err;
- err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
+ err = gpio_direction_output(ctrl[i],
+ gpio_get_value_cansleep(ctrl[i]));
if (err)
return err;
}