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c18e276030
The current implementation gets device lifetime tracking wrong. The
problem is that allocation of struct counter_device is controlled by the
individual drivers but this structure contains a struct device that
might have to live longer than a driver is bound. As a result a command
sequence like:
{ sleep 5; echo bang; } > /dev/counter0 &
sleep 1;
echo 40000000.timer:counter > /sys/bus/platform/drivers/stm32-timer-counter/unbind
can keep a reference to the struct device and unbinding results in
freeing the memory occupied by this device resulting in an oops.
This commit provides two new functions (plus some helpers):
- counter_alloc() to allocate a struct counter_device that is
automatically freed once the embedded struct device is released
- counter_add() to register such a device.
Note that this commit doesn't fix any issues, all drivers have to be
converted to these new functions to correct the lifetime problems.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211230150300.72196-14-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>