From: Tony Lindgren <tony@atomide.com>
Date: Tue, 21 Oct 2008 17:51:40 +0000 (-0700)
Subject: ARM: OMAP3: Fix get_irqnr_and_base to clear spurious interrupt bits
X-Git-Tag: v2.6.27-omap1~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c1380c66fb23f26807b2810eee19028a77f2b03;p=pandora-kernel.git

ARM: OMAP3: Fix get_irqnr_and_base to clear spurious interrupt bits

On omap24xx, INTCPS_SIR_IRQ_OFFSET bits [6:0] contains the current
active interrupt number.

However, on 34xx INTCPS_SIR_IRQ_OFFSET bits [31:7] also contains the
SPURIOUSIRQFLAG, which gets set if the interrupt sorting information
is invalid.

If the SPURIOUSIRQFLAG bits are not ignored, the interrupt code will
occasionally produce a bunch of confusing errors:

irq -33, desc: c02ddcc8, depth: 0, count: 0, unhandled: 0
->handle_irq():  c006f23c, handle_bad_irq+0x0/0x22c
->chip(): 00000000, 0x0
->action(): 00000000

Fix this by masking out only the ACTIVEIRQ bits. Also fix a
confusing comment.

Signed-off-by: Tony Lindgren <tony@atomide.com>
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