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mISDN: Fix division by zero

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If DTMF debug is set and tresh goes under 100, the printk will cause
a division by zero.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Keil 2012-04-24 02:51:51 +00:00 committed by David S. Miller
parent 52a637c2a5
commit efef50a59f
1 changed files with 14 additions and 5 deletions
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19
drivers/isdn/mISDN/dsp_dtmf.c
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@ -222,16 +222,25 @@ coefficients:
goto storedigit;
}
if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
if (dsp_debug & DEBUG_DSP_DTMFCOEFF) {
s32 tresh_100 = tresh/100;
if (tresh_100 == 0) {
tresh_100 = 1;
printk(KERN_DEBUG
"tresh(%d) too small set tresh/100 to 1\n",
tresh);
}
printk(KERN_DEBUG "a %3d %3d %3d %3d %3d %3d %3d %3d"
" tr:%3d r %3d %3d %3d %3d %3d %3d %3d %3d\n",
result[0] / 10000, result[1] / 10000, result[2] / 10000,
result[3] / 10000, result[4] / 10000, result[5] / 10000,
result[6] / 10000, result[7] / 10000, tresh / 10000,
result[0] / (tresh / 100), result[1] / (tresh / 100),
result[2] / (tresh / 100), result[3] / (tresh / 100),
result[4] / (tresh / 100), result[5] / (tresh / 100),
result[6] / (tresh / 100), result[7] / (tresh / 100));
result[0] / (tresh_100), result[1] / (tresh_100),
result[2] / (tresh_100), result[3] / (tresh_100),
result[4] / (tresh_100), result[5] / (tresh_100),
result[6] / (tresh_100), result[7] / (tresh_100));
}
/* calc digit (lowgroup/highgroup) */
lowgroup = -1;