| Message ID | 1417712328-29831-1-git-send-email-nm@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Dec 04, 2014 at 10:58:47AM -0600, Nishanth Menon wrote: > 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> Applied to hwmon-next. Do we need this in older kernels ? Thanks, Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 11:05-20141204, Guenter Roeck wrote: > On Thu, Dec 04, 2014 at 10:58:47AM -0600, Nishanth Menon wrote: > > 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> > > Applied to hwmon-next. Do we need this in older kernels ? I have'nt had a need for it till recently.. in terms of the sleepable get/set, it seems to have been introduced with commit 7560fa60fcdcdb0da662f6a9fad9064b554ef46c Author: David Brownell <david-b@pacbell.net> Date: Tue Mar 4 14:28:27 2008 -0800 gpio: <linux/gpio.h> and "no GPIO support here" stubs Guessing no one needed it so far.. so probably future should be good enough, I think..
On Thu, Dec 04, 2014 at 01:46:15PM -0600, Nishanth Menon wrote: > On 11:05-20141204, Guenter Roeck wrote: > > On Thu, Dec 04, 2014 at 10:58:47AM -0600, Nishanth Menon wrote: > > > 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> > > > > Applied to hwmon-next. Do we need this in older kernels ? > > I have'nt had a need for it till recently.. in terms of the sleepable > get/set, it seems to have been introduced with > commit 7560fa60fcdcdb0da662f6a9fad9064b554ef46c > Author: David Brownell <david-b@pacbell.net> > Date: Tue Mar 4 14:28:27 2008 -0800 > gpio: <linux/gpio.h> and "no GPIO support here" stubs > > Guessing no one needed it so far.. so probably future should be good > enough, I think.. > Ok. We can still add it to -stable at a later time if the need arises. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c index 4efa173..7802eb2 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; }
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> --- based on next-20141204 , but can rebase to required branch as needed. drivers/hwmon/gpio-fan.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)