[PATCH] hpet: remove superfluous register reads

This patch removes several reads of a timer's config register that serve no
purpose whatsoever.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index bf2f5a51c687..e3c7c0096e17 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -367,7 +367,6 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
         if (!devp->hd_ireqfreq)
                 return -EIO;
 
-        v = readq(&timer->hpet_config);
         spin_lock_irq(&hpet_lock);
 
         if (devp->hd_flags & HPET_IE) {
@@ -378,7 +377,6 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
         devp->hd_flags |= HPET_IE;
         spin_unlock_irq(&hpet_lock);
 
-        t = readq(&timer->hpet_config);
         irq = devp->hd_hdwirq;
 
         if (irq) {
@@ -855,11 +853,9 @@ int hpet_alloc(struct hpet_data *hdp)
         }
 
         for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
-                unsigned long v;
                 struct hpet_timer __iomem *timer;
 
                 timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
-                v = readq(&timer->hpet_config);
 
                 devp->hd_hpets = hpetp;
                 devp->hd_hpet = hpet;