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| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2021-12-21 17:16:48 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-21 10:32:08 +0100 |
| commit | c95cc0d95702523f8f361b802c9b7d4eeae07f5d (patch) | |
| tree | 9b8aaa31e81f711a28a6db38f7324c10623c8a05 /drivers/pcmcia/tcic.c | |
| parent | 60f07e74f86b47973bc1dc82e2128973932be55f (diff) | |
| download | linux-c95cc0d95702523f8f361b802c9b7d4eeae07f5d.tar.gz linux-c95cc0d95702523f8f361b802c9b7d4eeae07f5d.tar.bz2 linux-c95cc0d95702523f8f361b802c9b7d4eeae07f5d.zip | |
counter: 104-quad-8: Fix persistent enabled events bug
A bug exists if the user executes a COUNTER_ADD_WATCH_IOCTL ioctl call,
and then executes a COUNTER_DISABLE_EVENTS_IOCTL ioctl call. Disabling
the events should disable the 104-QUAD-8 interrupts, but because of this
bug the interrupts are not disabling.
The reason this bug is occurring is because quad8_events_configure() is
called when COUNTER_DISABLE_EVENTS_IOCTL is handled, but the
next_irq_trigger[] array has not been cleared before it is checked in
the loop.
This patch fixes the bug by removing the next_irq_trigger array and
instead utilizing a different algorithm of walking the events_list list
for the current requested events. When a COUNTER_DISABLE_EVENTS_IOCTL is
handled, events_list will be empty and thus all device channels end up
with interrupts disabled.
Fixes: 7aa2ba0df651 ("counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8")
Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/5fd5731cec1c251acee30eefb7c19160d03c9d39.1640072891.git.vilhelm.gray@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/pcmcia/tcic.c')
0 files changed, 0 insertions, 0 deletions