time: fix usec_to_tick()
authorStephen Warren <swarren@nvidia.com>
Thu, 5 Dec 2013 19:08:09 +0000 (12:08 -0700)
committerTom Rini <trini@ti.com>
Fri, 13 Dec 2013 14:15:33 +0000 (09:15 -0500)
commit2cd1b57220697ac47e4a63fb6a0a79eda2217f9d
tree2991c29b493004fde9cc67c9ab5fc05d42675dea
parent74c43bb3d3fa322af17322384324c63c947bb124
time: fix usec_to_tick()

Commit 8dfafdde88eb ("Introduce common timer functions") created a
common definition of usec_to_tick() which had a couple problems:

static unsigned long long usec_to_tick(unsigned long usec)
{
       uint64_t tick = usec * get_tbclk();

That likely overflows.

       usec *= get_tbclk();

That was an attempt to fix it by performing the multiply after the
promotion of usec to 64-bit, but was applied to the wrong variable,
which was never used.

This patch fixes these issues. A user-visible symptom of the problem was
the e.g. "dhcp zImage" using an ASIX USB Ethernet dongle would print:

Waiting for Ethernet connection... unable to connect.

... with no delay before "unable to connect". There are likely other
symptoms.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
lib/time.c