diff options
Diffstat (limited to 'drivers/gpio/gpio-mcp23s08.c')
| -rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 3d53fd6880d1..fe7c0e211f9a 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -714,7 +714,7 @@ fail: #ifdef CONFIG_OF #ifdef CONFIG_SPI_MASTER -static struct of_device_id mcp23s08_spi_of_match[] = { +static const struct of_device_id mcp23s08_spi_of_match[] = { { .compatible = "microchip,mcp23s08", .data = (void *) MCP_TYPE_S08, @@ -738,7 +738,7 @@ MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match); #endif #if IS_ENABLED(CONFIG_I2C) -static struct of_device_id mcp23s08_i2c_of_match[] = { +static const struct of_device_id mcp23s08_i2c_of_match[] = { { .compatible = "microchip,mcp23008", .data = (void *) MCP_TYPE_008, @@ -867,7 +867,7 @@ static int mcp23s08_probe(struct spi_device *spi) { struct mcp23s08_platform_data *pdata; unsigned addr; - unsigned chips = 0; + int chips = 0; struct mcp23s08_driver_data *data; int status, type; unsigned base = -1, @@ -894,11 +894,14 @@ 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++) { - if ((spi_present_mask & (1 << addr))) - chips++; pullups[addr] = 0; + if (spi_present_mask & (1 << addr)) + chips++; } + if (!chips) + return -ENODEV; } else { type = spi_get_device_id(spi)->driver_data; pdata = dev_get_platdata(&spi->dev); @@ -937,6 +940,10 @@ static int mcp23s08_probe(struct spi_device *spi) if (!(spi_present_mask & (1 << addr))) continue; chips--; + if (chips < 0) { + dev_err(&spi->dev, "FATAL: invalid negative chip id\n"); + goto fail; + } data->mcp[addr] = &data->chip[chips]; status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi, 0x40 | (addr << 1), type, base, |