linux-toradex.git/kernel/irq/irqdesc.c, branch v3.0.2

genirq: Ensure we locate the passed IRQ in irq_alloc_descs()

2011-06-03T12:53:16+00:00

When irq_alloc_descs() is called with no base IRQ specified then it will
search for a range of IRQs starting from a specified base address. In the
case where an IRQ is specified it still does this search in order to ensure
that none of the requested range is already allocated and it still uses the
from parameter to specify the base for the search. This means that in the
case where a base is specified but from is zero (which is reasonable as
any IRQ number is in the range specified by a zero from) the function will
get confused and try to allocate the first suitably sized block of free IRQs
it finds.

Instead use a specified IRQ as the base address for the search, and insist
that any from that is specified can support that IRQ.

Signed-off-by: Mark Brown 
Link: http://lkml.kernel.org/r/1307037313-15733-1-git-send-email-broonie@opensource.wolfsonmicro.com
Signed-off-by: Thomas Gleixner

genirq: Fix descriptor init on non-sparse IRQs

2011-06-03T12:53:16+00:00

The genirq changes are initializing descriptors for sparse IRQs quite
differently from how non-sparse (stacked?) IRQs are initialized, with
the effect that on my platform all IRQs are default-disabled on sparse
IRQs and default-enabled if non-sparse IRQs are used, crashing some
GPIO driver.

Fix this by refactoring the non-sparse IRQs to use the same descriptor
init function as the sparse IRQs.

Signed-off: Linus Walleij 
Link: http://lkml.kernel.org/r/1306858479-16622-1-git-send-email-linus.walleij@stericsson.com
Cc: stable@kernel.org # 2.6.39
Signed-off-by: Thomas Gleixner

irq: Export functions to allow modular irq drivers

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

Export handle_simple_irq, irq_modify_status, irq_alloc_descs,
irq_free_descs and generic_handle_irq to allow their usage in
modules. First user is IIO, which wants to be built modular, but needs
to be able to create irq chips, allocate and configure interrupt
descriptors and handle demultiplexing interrupts.

[ tglx: Moved the uninlinig of generic_handle_irq to a separate patch ]

Signed-off-by: Jonathan Cameron 
Link: http://lkml.kernel.org/r/%3C1305711544-505-1-git-send-email-jic23%40cam.ac.uk%3E
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: Remove pointless ifdefs

2011-05-18T12:59:07+00:00

kernel/irq/ is only built when CONFIG_GENERIC_HARDIRQS=y. So making
code inside of kernel/irq/ conditional on CONFIG_GENERIC_HARDIRQS is
pointless.

Signed-off-by: Thomas Gleixner

genirq: Move INPROGRESS, MASKED and DISABLED state flags to irq_data

2011-03-28T14:55:10+00:00

We really need these flags for some of the interrupt chips. Move it
from internal state to irq_data and provide proper accessors.

Signed-off-by: Thomas Gleixner 
Cc: David Daney

genirq: Add irq disabled flag to irq_data state

2011-03-27T15:45:58+00:00

Some irq_chip implementation require to know the disabled state of the
interrupt in certain callbacks. Add a state flag and accessor to
irq_data.

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: Use IRQ_BITMAP_BITS as search size in irq_alloc_descs()

2011-02-21T20:20:00+00:00

The runtime expansion of nr_irqs does not take into account that
bitmap_find_next_zero_area() returns "start" + size in case the search
for an matching zero area fails. That results in a start value which
can be completely off and is not covered by the following
expand_nr_irqs() and possibly outside of the absolute limit. But we
use it without further checking.

Use IRQ_BITMAP_BITS as the limit for the bitmap search and expand
nr_irqs when the start bit is beyond nr_irqs. So start is always
pointing to the correct area in the bitmap. nr_irqs is just the limit
for irq enumerations, not the real limit for the irq space.

[ tglx: Let irq_expand_nr_irqs() take the new upper end so we do not
  	expand nr_irqs more than necessary. Made changelog readable ]

Signed-off-by: Yinghai Lu 
LKML-Reference: <4D6014F9.8040605@kernel.org>
Signed-off-by: Thomas Gleixner

genirq: Implement irq_get/put_desc_[bus]locked/unlock()

2011-02-19T11:58:23+00:00

Most of the managing functions get the irq descriptor and lock it -
either with or without buslock. Instead of open coding this over and
over provide a common function to do that.

Signed-off-by: Thomas Gleixner