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authorAlexandre Courbot <acourbot@nvidia.com>2014-12-02 23:15:05 +0900
committerLinus Walleij <linus.walleij@linaro.org>2014-12-02 15:46:36 +0100
commit0e9a5edf5d01356fa4a561772a25d97b3fd13de6 (patch)
treefc38446b2de4c5edd95f69df5d770cd48779a2d6 /Documentation/devicetree/bindings/gpio
parent834296a3c66257616d14aef245dbe86111b5ef6b (diff)
gpio: fix deferred probe detection for legacy API
Commit 14e85c0e69d5 ("gpio: remove gpio_descs global array") changed gpio_to_desc()'s behavior to return NULL not only for GPIOs numbers not in the valid range, but also for all GPIOs whose controller has not been probed yet. Although this behavior is more correct (nothing hints that these GPIO numbers will be populated later), this affects gpio_request() and gpio_request_one() which call gpiod_request() with a NULL descriptor, causing it to return -EINVAL instead of the expected -EPROBE_DEFER for a non-probed GPIO. gpiod_request() is only called with a descriptor obtained from gpio_to_desc() from these two functions, so address the issue there. Other ways to obtain GPIOs rely on well-defined mappings and can thus return -EPROBE_DEFER only for relevant GPIOs, and are thus not affected by this issue. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/gpio')
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