[PATCH] hpet: fix division by zero in HPET_INFO
Fix a division by zero that happened when the HPET_INFO ioctl was called
before a timer frequency had been set.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index c85d11d..bc5ee99b9 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -494,8 +494,11 @@
{
struct hpet_info info;
- info.hi_ireqfreq = hpet_time_div(hpetp,
- devp->hd_ireqfreq);
+ if (devp->hd_ireqfreq)
+ info.hi_ireqfreq =
+ hpet_time_div(hpetp, devp->hd_ireqfreq);
+ else
+ info.hi_ireqfreq = 0;
info.hi_flags =
readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
info.hi_hpet = devp->hd_hpets->hp_which;