m68knommu: fix broken ColdFire slice timer read_clk() code
authorGreg Ungerer <gerg@uclinux.org>
Wed, 16 Nov 2011 05:09:02 +0000 (15:09 +1000)
committerGreg Ungerer <gerg@uclinux.org>
Sat, 24 Dec 2011 11:47:58 +0000 (21:47 +1000)
commit1f2aab01ba2f6c591dee93daf4b57fd9785f3b41
tree78f44c9a87f8664fcdf1569be87a89efe0bfe9ea
parentec84118795fa687192de04e0dcb63178e4bf63e5
m68knommu: fix broken ColdFire slice timer read_clk() code

There is a race on reading the ColdFire slice timer current count and the
total clock count so far. Interrupts are off, and we may have just missed
getting a new timer wrap event interrupt. Check for this and adjust the
cycle count and current read count accordingly.

Also the slice timer counts down from the terminal count. So in read_clk()
we need take the current clock count away from the terminal count.

Reported-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
arch/m68k/platform/coldfire/sltimers.c