talos-op-linux/include/linux/irqdesc.h, branch v3.1

irq: Track the owner of irq descriptor

2011-07-28T09:23:21+00:00

Interrupt descriptors can be allocated from modules. The interrupts are used by other modules, but we have no refcount on the module which provides the interrupts and there is no way to establish one on the device level as the interrupt using module is agnostic to the fact that the interrupt is provided by a module rather than by some builtin interrupt controller. To prevent removal of the interrupt providing module, we can track the owner of the interrupt descriptor, which also provides the relevant irq chip functions in the irq descriptor. request/setup_irq() can now acquire a refcount on the owner module to prevent unloading. free_irq() drops the refcount. Signed-off-by: Sebastian Andrzej Siewior Link: http://lkml.kernel.org/r/20110711101731.GA13804@Chamillionaire.breakpoint.cc Signed-off-by: Thomas Gleixner

genirq: Uninline and sanity check generic_handle_irq()

2011-05-18T12:59:08+00:00

generic_handle_irq() is missing a NULL pointer check for the result of irq_to_desc. This was a not a big problem, but we want to expose it to drivers, so we better have sanity checks in place. Add a return value as well, which indicates that the irq number was valid and the handler was invoked. Based on the pure code move from Jonathan Cameron. Signed-off-by: Thomas Gleixner Cc: Jonathan Cameron

genirq: irq_desc: Document preflow_handler and affinity_hint

2011-04-23T13:56:24+00:00

[ tglx: Filled in the FIXME place holders ] Signed-off-by: Geert Uytterhoeven Link: http://lkml.kernel.org/r/%3C1302426113-13808-2-git-send-email-geert%40linux-m68k.org%3E Signed-off-by: Thomas Gleixner

genirq: Forgotten updates/deletions after removal of compat code

2011-04-23T13:56:23+00:00

commit 0c6f8a8b917ad361319c8ace3e9f28e69bfdb4c1 ("genirq: Remove compat code") removed the compat code, but forgot to update some references in comments and delete some of its documentation. Signed-off-by: Geert Uytterhoeven Link: http://lkml.kernel.org/r/%3C1302426113-13808-1-git-send-email-geert%40linux-m68k.org%3E Signed-off-by: Thomas Gleixner

genirq: Remove compat code

2011-03-29T12:48:19+00:00

Signed-off-by: Thomas Gleixner

genirq: Provide locked setter for chip, handler, name

2011-03-23T19:22:06+00:00

Some irq_set_type() callbacks need to change the chip and the handler when the trigger mode changes. We have already a (misnomed) setter function for the handler which can be called from irq_set_type(). Provide one which allows to set chip and name as well. Put the misnomed function under the COMPAT switch and provide a replacement. Signed-off-by: Thomas Gleixner

genirq: Provide a lockdep helper

2011-03-23T19:22:06+00:00

Some irq chips need to call genirq functions for nested chips from their callbacks. That upsets lockdep. So they need to set a different lock class for those nested chips. Provide a helper function to avoid open access to irq_desc. Signed-off-by: Thomas Gleixner

genirq; Remove the last leftovers of the old sparse irq code

2011-03-23T19:22:06+00:00

All users converted. Get rid of it. Signed-off-by: Thomas Gleixner

genirq: Add desc->irq_data accessor

2011-03-11T13:15:35+00:00

We have accessors for all fields in irq_data based on irq_desc, but not for irq_data itself. Signed-off-by: Thomas Gleixner

genirq: Prepare the handling of shared oneshot interrupts

2011-02-25T19:24:21+00:00

For level type interrupts we need to track how many threads are on flight to avoid useless interrupt storms when not all thread handlers have finished yet. Keep track of the woken threads and only unmask when there are no more threads in flight. Yes, I'm lazy and using a bitfield. But not only because I'm lazy, the main reason is that it's way simpler than using a refcount. A refcount based solution would need to keep track of various things like crashing the irq thread, spurious interrupts coming in, disables/enables, free_irq() and some more. The bitfield keeps the tracking simple and makes things just work. It's also nicely confined to the thread code pathes and does not require additional checks all over the place. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra LKML-Reference: <20110223234956.388095876@linutronix.de>