Commit
2cd1b57220697ac47e4a63fb6a0a79eda2217f9d
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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>
Showing
1 changed file
with
2 additions
and
2 deletions
Side-by-side Diff
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@@ -71,8 +71,8 @@ |
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} |
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static unsigned long long usec_to_tick(unsigned long usec) |
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{ |
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- uint64_t tick = usec * get_tbclk(); |
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- usec *= get_tbclk(); |
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+ uint64_t tick = usec; |
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+ tick *= get_tbclk(); |
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do_div(tick, 1000000); |
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return tick; |
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} |