On Thu, May 28, 2015 at 06:33:40PM +0530, Vaibhav Hiremath wrote:
> In order to avoid "spurious irq" caused by CP polling mode,
> enable irq at the entry of i2c_pxa_xfer() fn and disable it
> again before exit.

NAK.

It's really not nice for drivers to disable a potentially shared interrupt.
If the interrupt is shared, you disable the interrupt for other users of
that interrupt as well.  See:

commit c66dc529194be374556d166ee7ddb84a7d1d302b
Author: Sebastian Andrzej Siewior <[email protected]>
Date:   Wed Feb 23 12:38:18 2011 +0100

    i2c-pxa2xx: add support for shared IRQ handler

    Sodaville has three of them on a single IRQ. IRQF_DISABLED is removed
    because it is a NOP allready and scheduled for removal.

    Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
    Signed-off-by: Dirk Brandewie <[email protected]>
    Signed-off-by: Ben Dooks <[email protected]>

So you're breaking Sodaville.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
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