diff options
| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2018-12-04 18:58:43 +0300 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2018-12-05 12:59:38 +0300 |
| commit | 48a2ca0ee3994df53da230c7079a18a70ec914f9 (patch) | |
| tree | c7554dfbe124ef880ce1138d43c9aca74f6cf9fa /drivers/mfd | |
| parent | 651022382c7f8da46cb4872a545ee1da6d097d2a (diff) | |
| download | linux-48a2ca0ee3994df53da230c7079a18a70ec914f9.tar.xz | |
Revert "mfd: cros_ec: Use devm_kzalloc for private data"
This reverts commit 3aa2177e47878f7e7616da8a2050c44f22301b6e.
That commit triggered a new WARN when unloading the module (see at the
end of the commit message). When a class_dev is embedded in a structure
then that class_dev is the thing that controls the lifetime of that
structure, for that reason device managed allocations can't be used here.
See Documentation/kobject.txt.
Revert the above patch, so the struct is allocated using kzalloc and we
have a release function for it that frees the allocated memory, otherwise
it is broken.
------------[ cut here ]------------
Device 'cros_ec' does not have a release() function, it is broken and must be fixed.
WARNING: CPU: 3 PID: 3675 at drivers/base/core.c:895 device_release+0x80/0x90
Modules linked in: btusb btrtl btintel btbcm bluetooth ...
CPU: 3 PID: 3675 Comm: rmmod Not tainted 4.20.0-rc4 #76
Hardware name: Google Kevin (DT)
pstate: 40000005 (nZcv daif -PAN -UAO)
pc : device_release+0x80/0x90
lr : device_release+0x80/0x90
sp : ffff00000c47bc70
x29: ffff00000c47bc70 x28: ffff8000e86b0d40
x27: 0000000000000000 x26: 0000000000000000
x25: 0000000056000000 x24: 0000000000000015
x23: ffff8000f0bbf860 x22: ffff000000d320a0
x21: ffff8000ee93e100 x20: ffff8000ed931428
x19: ffff8000ed931418 x18: 0000000000000020
x17: 0000000000000000 x16: 0000000000000000
x15: 0000000000000400 x14: 0000000000000143
x13: 0000000000000000 x12: 0000000000000400
x11: 0000000000000157 x10: 0000000000000960
x9 : ffff00000c47b9b0 x8 : ffff8000e86b1700
x7 : 0000000000000000 x6 : ffff8000f7d520b8
x5 : ffff8000f7d520b8 x4 : 0000000000000000
x3 : ffff8000f7d58e68 x2 : ffff8000e86b0d40
x1 : 37d859939c964800 x0 : 0000000000000000
Call trace:
device_release+0x80/0x90
kobject_put+0x74/0xe8
device_unregister+0x20/0x30
ec_device_remove+0x34/0x48 [cros_ec_dev]
platform_drv_remove+0x28/0x48
device_release_driver_internal+0x1a8/0x240
driver_detach+0x40/0x80
bus_remove_driver+0x54/0xa8
driver_unregister+0x2c/0x58
platform_driver_unregister+0x10/0x18
cros_ec_dev_exit+0x1c/0x2d8 [cros_ec_dev]
__arm64_sys_delete_module+0x16c/0x1f8
el0_svc_common+0x84/0xd8
el0_svc_handler+0x2c/0x80
el0_svc+0x8/0xc
---[ end trace a57c4625f3c60ae8 ]---
Cc: stable@vger.kernel.org
Fixes: 3aa2177e4787 ("mfd: cros_ec: Use devm_kzalloc for private data")
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/cros_ec_dev.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 8f9d6964173e..b99a194ce5a4 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -263,6 +263,11 @@ static const struct file_operations fops = { #endif }; +static void cros_ec_class_release(struct device *dev) +{ + kfree(to_cros_ec_dev(dev)); +} + static void cros_ec_sensors_register(struct cros_ec_dev *ec) { /* @@ -395,7 +400,7 @@ static int ec_device_probe(struct platform_device *pdev) int retval = -ENOMEM; struct device *dev = &pdev->dev; struct cros_ec_platform *ec_platform = dev_get_platdata(dev); - struct cros_ec_dev *ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL); + struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL); if (!ec) return retval; @@ -417,6 +422,7 @@ static int ec_device_probe(struct platform_device *pdev) ec->class_dev.devt = MKDEV(ec_major, pdev->id); ec->class_dev.class = &cros_class; ec->class_dev.parent = dev; + ec->class_dev.release = cros_ec_class_release; retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name); if (retval) { |