gpiolib: improve overlap check of range of gpio

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There are limitations for the current checker:
1.  Could not check the overlap if the new gpiochip is the secondly
    gpiochip.
2.  Could not check the overlap if the new gpiochip is overlap
    with the left of gpiochip. E.g. if we insert [c, d] between
    [a,b] and [e, f], and e >= c + d, it will successful even if
    c < a + b.
3.  Allow overlap of base of different gpiochip.

This patch fix these issues by checking the overlap of both right and
left gpiochip in the same loop statement.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
[Tweaked to remove unnecessary ret variable]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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This commit is contained in:

Bamvor Jian Zhang 2015-11-16 13:02:46 +08:00 • committed by Linus Walleij

parent ed37915cb1

commit ef7c755303

1 changed files with 36 additions and 19 deletions

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drivers/gpio/gpiolib.c

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