From: Yury Georgievskiy <ygeorgie@gmail.com>
Date: Tue, 20 Jul 2010 22:26:50 +0000 (-0700)
Subject: serial: mcf: don't take spinlocks in already protected functions
X-Git-Tag: v2.6.36-rc1~294^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ac8382e9cfdd723445692fc97aaa4643929750d;p=pandora-kernel.git

serial: mcf: don't take spinlocks in already protected functions

Don't take the port spinlock in uart functions where the serial core
already takes care of locking/unlocking them.

The code would actually lock up on architectures where spinlocks are
implemented.

Also protect calling mcf_rx_chars/mcf_tx_chars in the interrupt handler by
the port spinlock and use IRQ_RETVAL to return from isr.

[akpm@linux-foundation.org: make irq-handler return value more explicit]
Signed-off-by: Yury Georgievskiy <ygeorgie@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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