linux.git/kernel/irq/chip.c, branch v2.6.24

genirq: revert lazy irq disable for simple irqs

2007-12-18T17:05:58+00:00

In commit 76d2160147f43f982dfe881404cfde9fd0a9da21 lazy irq disabling
was implemented, and the simple irq handler had a masking set to it.

Remy Bohmer discovered that some devices in the ARM architecture
would trigger the mask, but never unmask it. His patch to do the
unmasking was questioned by Russell King about masking simple irqs
to begin with. Looking further, it was discovered that the problems
Remy was seeing was due to improper use of the simple handler by
devices, and he later submitted patches to fix those. But the issue
that was uncovered was that the simple handler should never mask.

This patch reverts the masking in the simple handler.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner 
Acked-by: Russell King

Compile handle_percpu_irq even for uniprocessor kernels

2007-10-17T15:43:00+00:00

Compiling handle_percpu_irq only on uniprocessor generates an artificial
special case so a typical use like:

  set_irq_chip_and_handler(irq, &some_irq_type, handle_percpu_irq);

needs to be conditionally compiled only on SMP systems as well and an
alternative UP construct is usually needed - for no good reason.

This fixes uniprocessor configurations for some MIPS SMP systems.

Signed-off-by: Ralf Baechle 
Acked-by: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

genirq: cleanup mismerge artifact

2007-08-12T18:05:45+00:00

Commit 5a43a066b11ac2fe84cf67307f20b83bea390f83: "genirq: Allow fasteoi
handler to retrigger disabled interrupts" was erroneously applied to
handle_level_irq().  This added the irq retrigger / resend functionality
to the level irq handler.

Revert the offending bits.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Linus Torvalds

MSI: arch must connect the irq and the msi_desc

2007-05-03T02:02:38+00:00

set_irq_msi() currently connects an irq_desc to an msi_desc. The archs call
it at some point in their setup routine, and then the generic code sets up the
reverse mapping from the msi_desc back to the irq.

set_irq_msi() should do both connections, making it the one and only call
required to connect an irq with it's MSI desc and vice versa.

The arch code MUST call set_irq_msi(), and it must do so only once it's sure
it's not going to fail the irq allocation.

Given that there's no need for the arch to return the irq anymore, the return
value from the arch setup routine just becomes 0 for success and anything else
for failure.

Signed-off-by: Michael Ellerman 
Signed-off-by: Greg Kroah-Hartman

[PATCH] small irq management simplification

2007-02-16T16:14:00+00:00

Use mask_ack_irq() where possible.

Signed-off-by: Jan Beulich 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] IRQ kernel-doc fixes

2007-02-16T16:14:00+00:00

Fix kernel-doc warnings in IRQ management.

Signed-off-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] genirq: do not mask interrupts by default

2007-02-16T16:14:00+00:00

Never mask interrupts immediately upon request.  Disabling interrupts in
high-performance codepaths is rare, and on the other hand this change could
recover lost edges (or even other types of lost interrupts) by conservatively
only masking interrupts after they happen.  (NOTE: with this change the
highlevel irq-disable code still soft-disables this IRQ line - and if such an
interrupt happens then the IRQ flow handler keeps the IRQ masked.)

Mark i8529A controllers as 'never loses an edge'.

Signed-off-by: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

msi: Kill the msi_desc array.

2007-02-07T23:50:08+00:00

We need to be able to get from an irq number to a struct msi_desc.
The msi_desc array in msi.c had several short comings the big one was
that it could not be used outside of msi.c.  Using irq_data in struct
irq_desc almost worked except on some architectures irq_data needs to
be used for something else.

So this patch adds a msi_desc pointer to irq_desc, adds the appropriate
wrappers and changes all of the msi code to use them.

The dynamic_irq_init/cleanup code was tweaked to ensure the new
field is left in a well defined state.

Signed-off-by: Eric W. Biederman 
Acked-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

[PATCH] genirq: fix irq flow handler uninstall

2006-12-22T16:55:48+00:00

The sanity check for no_irq_chip in __set_irq_hander() is unconditional on
both install and uninstall of an handler.  This triggers false warnings and
replaces no_irq_chip by dummy_irq_chip in the uninstall case.

Check only, when a real handler is installed.

Signed-off-by: Thomas Gleixner 
Acked-by: Ingo Molnar 
Acked-by: Sylvain Munaut 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] __set_irq_handler bogus space

2006-12-21T08:08:27+00:00

__set_irq_handler: Kill a bogus space

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Linus Torvalds