diff options
| author | Michael Welling <mwelling@ieee.org> | 2014-04-16 20:00:24 -0500 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-05-09 10:28:16 +0200 |
| commit | 99e4b98dbe3ad1fe38a74d12c3b8d44a55930de4 (patch) | |
| tree | 209a4794bec9611e0c0255c5057a541fee6b209d /drivers/gpio/gpio-mcp23s08.c | |
| parent | a7008ee1a423720e755e08f33b63669795c1f072 (diff) | |
gpio: mcp23s08: Bug fix of SPI device tree registration.gpio-v3.15-3
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.
Cc: stable@vger.kernel.org
Signed-off-by: Michael Welling <mwelling@ieee.org>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mcp23s08.c')
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 99a68310e7c0..3d53fd6880d1 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -894,9 +894,11 @@ static int mcp23s08_probe(struct spi_device *spi) dev_err(&spi->dev, "invalid spi-present-mask\n"); return -ENODEV; } - - for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) + for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) { + if ((spi_present_mask & (1 << addr))) + chips++; pullups[addr] = 0; + } } else { type = spi_get_device_id(spi)->driver_data; pdata = dev_get_platdata(&spi->dev); @@ -919,12 +921,12 @@ 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) |