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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>
This commit is contained in:
parent
90652efeba
commit
52a95c1185
1 changed files with 5 additions and 4 deletions
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@ -79,7 +79,7 @@ static ssize_t show_fan_alarm(struct device *dev,
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{
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struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
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struct gpio_fan_alarm *alarm = fan_data->alarm;
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int value = gpio_get_value(alarm->gpio);
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int value = gpio_get_value_cansleep(alarm->gpio);
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if (alarm->active_low)
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value = !value;
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@ -131,7 +131,7 @@ static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
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int i;
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for (i = 0; i < fan_data->num_ctrl; i++)
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gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
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gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1);
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}
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static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
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@ -142,7 +142,7 @@ static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
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for (i = 0; i < fan_data->num_ctrl; i++) {
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int value;
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value = gpio_get_value(fan_data->ctrl[i]);
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value = gpio_get_value_cansleep(fan_data->ctrl[i]);
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ctrl_val |= (value << i);
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}
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return ctrl_val;
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@ -369,7 +369,8 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
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if (err)
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return err;
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err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
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err = gpio_direction_output(ctrl[i],
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gpio_get_value_cansleep(ctrl[i]));
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if (err)
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return err;
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}
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