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spi/spi_s3c64xx: Make probe more robust against missing board config 

The S3C64xx SPI driver requires the machine to call s3c64xx_spi_set_info()
to select a few options, including the clock to use for the SPI controller.
If this is not done then a NULL will be passed as the clock name for
clk_get(), causing an obscure crash. Guard against this and other missing
configuration by validating that the clock name has been filled in in
the platform data that ets passed in.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Mark Brown 2010-09-01 08:55:22 -06:00 committed by Grant Likely
parent 2bfc96a127
commit cc0fc0bbeb
1 changed files with 7 additions and 2 deletions
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9
drivers/spi/spi_s3c64xx.c
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@ -919,6 +919,13 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
return -ENODEV;
}
sci = pdev->dev.platform_data;
if (!sci->src_clk_name) {
dev_err(&pdev->dev,
"Board init must call s3c64xx_spi_set_info()\n");
return -EINVAL;
}
/* Check for availability of necessary resource */
dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@ -946,8 +953,6 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
return -ENOMEM;
}
sci = pdev->dev.platform_data;
platform_set_drvdata(pdev, master);
sdd = spi_master_get_devdata(master);