[PATCH -next] ALSA: AACI: fix crash in aaci_size_fifo

[Marc Zyngier]

Commit ad58498 (ALSA: AACI: allow writes to MAINCR to take effect)
that appeared in next-20110207 added a statement treating the maincr
value as an address.  This leads to a crash while probing the device:

Unable to handle kernel NULL pointer dereference at virtual address 00000079
pgd = c0004000
[00000079] *pgd=00000000
Internal error: Oops: 1 [#1] PREEMPT SMP
last sysfs file:
Modules linked in:
CPU: 2    Not tainted  (2.6.38-rc3-next-20110207-00031-g7ed0487 #12)
PC is at aaci_probe+0x438/0x5bc
LR is at 0x79
pc : [<c0385b98>]    lr : [<00000079>]    psr: 60000013
sp : df83beb0  ip : e08be000  fp : 00000000
r10: 00000000  r9 : 00000000  r8 : 00000000
r7 : c048e1c0  r6 : df9a65f8  r5 : c0492840  r4 : 00000200
r3 : 00000000  r2 : e08be000  r1 : 00000079  r0 : 00000078
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c5387f  Table: 8000406a  DAC: 00000015

As this is probably only a debug leftover, get rid of the statement altogether.

Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
 sound/arm/aaci.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
index b4cda4b..3705c83 100644
--- a/sound/arm/aaci.c
+++ b/sound/arm/aaci.c
@@ -970,7 +970,6 @@ static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
 	 * disabling the channel doesn't clear the FIFO.
 	 */
 	writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
-	readl(aaci->maincr);
 	udelay(1);
 	writel(aaci->maincr, aaci->base + AACI_MAINCR);
 
-- 
1.7.0.4