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[PATCH] hpet: disallow zero interrupt frequency

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Disallow setting an interrupt frequency of zero (which would result in a
division by zero), and disallow enabling the interrupt when the frequency
hasn't yet been set (which would use an interrupt period of zero).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Clemens Ladisch 2005-10-30 15:03:29 -08:00 committed by Linus Torvalds
parent 874ec33ff9
commit 9090e6db87
1 changed files with 4 additions and 1 deletions
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5
drivers/char/hpet.c
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@ -364,6 +364,9 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
hpet = devp->hd_hpet;
hpetp = devp->hd_hpets;
if (!devp->hd_ireqfreq)
return -EIO;
v = readq(&timer->hpet_config);
spin_lock_irq(&hpet_lock);
@ -516,7 +519,7 @@ hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel)
break;
}
if (arg & (arg - 1)) {
if (!arg || (arg & (arg - 1))) {
err = -EINVAL;
break;
}