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Input: ads7846 - return error on regulator_get() failure 

In probe(), if regulator_get() failed, an error code was not being
returned causing the driver to be successfully bound, even though
probe failed.  This in turn caused the suspend, resume and remove
methods to be registered and accessed via the SPI core.  Since these
functions all access private driver data using pointers that had been
freed during the failed probe, this would lead to unpredictable
behavior.

This patch ensures that probe() returns an error code in this failure
case so the driver is not bound.

Found using lockdep and noticing the lock used in the suspend/resum
path pointed to a bogus lock due to the freed memory.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Kevin Hilman 2010-05-26 23:30:55 -07:00 committed by Dmitry Torokhov
parent f2126a9967
commit 067fb2f648
1 changed files with 2 additions and 2 deletions
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4
drivers/input/touchscreen/ads7846.c
View File

@ -1163,8 +1163,8 @@ static int __devinit ads7846_probe(struct spi_device *spi)
ts->reg = regulator_get(&spi->dev, "vcc");
if (IS_ERR(ts->reg)) {
dev_err(&spi->dev, "unable to get regulator: %ld\n",
PTR_ERR(ts->reg));
err = PTR_ERR(ts->reg);
dev_err(&spi->dev, "unable to get regulator: %ld\n", err);
goto err_free_gpio;
}