Revert "i2c: core: Dispose OF IRQ mapping at client removal time"

commit a49445727014216703a3c28ccee4cef36d41571e upstream.

This reverts commit e4df3a0b6228
("i2c: core: Dispose OF IRQ mapping at client removal time")

Calling irq_dispose_mapping() will destroy the mapping and disassociate
the IRQ from the IRQ chip to which it belongs. Keeping it is OK, because
existent mappings are reused properly.

Also, this commit breaks drivers using devm* for IRQ management on
OF-based systems because devm* cleanup happens in device code, after
bus's remove() method returns.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Reported-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
[wsa: updated the commit message with findings fromt the other bug report]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: e4df3a0b6228
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 4716eb0bddcd891241a25e3a692c5107363fe7c6..7c7f4b856badaea86063483e3b37c49485e411d3 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -297,9 +297,6 @@ static int i2c_device_remove(struct device *dev)
                status = driver->remove(client);
        }
 
-       if (dev->of_node)
-               irq_dispose_mapping(client->irq);
-
        acpi_dev_pm_detach(&client->dev, true);
        return status;
 }