diff options
| author | Michael Welling <mwelling@ieee.org> | 2014-04-16 20:00:24 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-11 11:54:14 -0700 |
| commit | f10acdb935fa79b48719e0a7bf284b7c1e5bf776 (patch) | |
| tree | 2abaad4ed38a8667f07a581115b1fdb9bc7cc772 | |
| parent | 3af2e71643df2f603bea99a7e0e13afbf9ea6d78 (diff) | |
gpio: mcp23s08: Bug fix of SPI device tree registration.
commit 99e4b98dbe3ad1fe38a74d12c3b8d44a55930de4 upstream.
The chips variable needs to be incremented for each chip that is
found in the spi_present_mask when registering via device tree.
Without this and the checking a negative index is passed to the
data->chip array in a subsequent loop.
Signed-off-by: Michael Welling <mwelling@ieee.org>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 1ac288ea810d..aa379971d703 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -895,8 +895,11 @@ static int mcp23s08_probe(struct spi_device *spi) return -ENODEV; } - for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) + for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) { pullups[addr] = 0; + if (spi_present_mask & (1 << addr)) + chips++; + } } else { type = spi_get_device_id(spi)->driver_data; pdata = dev_get_platdata(&spi->dev); @@ -919,12 +922,12 @@ static int mcp23s08_probe(struct spi_device *spi) pullups[addr] = pdata->chip[addr].pullups; } - if (!chips) - return -ENODEV; - base = pdata->base; } + if (!chips) + return -ENODEV; + data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08), GFP_KERNEL); if (!data) |