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author | Lars-Peter Clausen <lars@metafoo.de> | 2013-03-07 19:53:00 (GMT) |
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committer | Jonathan Cameron <jic23@kernel.org> | 2013-03-17 20:04:45 (GMT) |
commit | 1b9dc91e41e07125ef2ce7d0a8dde93ce3eaf414 (patch) | |
tree | 7623bf51b752090cf4f6f4266670a56adbdc40ec /lib | |
parent | b9606e2aa97d3d831d1236c0e789a33a2f867a8a (diff) | |
download | linux-fsl-qoriq-1b9dc91e41e07125ef2ce7d0a8dde93ce3eaf414.tar.xz |
iio: events: Make iio_push_event() IRQ context save
Currently it is not save to call iio_push_event() from hard IRQ context since
the IIO event code uses spin_lock()/spin_unlock() and it is not save to mix
calls to spin_lock()/spin_unlock() from different contexts on the same lock.
E.g. if the lock is being held in iio_event_chrdev_read() and an interrupts
kicks in and the interrupt handler calls iio_push_event() we end uo with a
deadlock.
This patch updates iio_push_event() to use spin_lock_irqsave()/
spin_unlock_irqstrestore(), since it can be called from both IRQ and non-IRQ
context. All other other users of the lock, which are always run in non-IRQ
context, are updated to spin_lock_irq()/spin_unlock_irq().
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions