pp_fifo: Fix full fifo losing all data on simultaneous push & pop

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The pp_fifo decides whether top = bottom means empty or full based
on whether the previous operation was a push or a pop.

If the fifo performs both in one cycle, it sets the previous op to
pop. That means that a full fifo being added a character and removed
one at the same time becomes empty.

Instead, just leave the previous op alone. If the fifo was empty, it
remains so, if it was full ditto.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

pull/177/head

Benjamin Herrenschmidt 5 years ago

parent 803ee9ef35

commit bd42580a42

1 changed files with 1 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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