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spi: imx: Gracefully handle NULL master->cs_gpios 

It is possible that master->cs_gpios is NULL after spi_bitbang_start(),
this happens if the master has no CS GPIOs specified in DT. Check for
this case after spi_bitbang_start() to prevent NULL pointer dereference
in the subsequent for loop, which accesses the master->cs_gpios field.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Martin Kaiser <martin@kaiser.cx>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marek Vasut 2016-09-26 14:14:53 +02:00 committed by Mark Brown
parent 15ca92156e
commit f13d4e189d
1 changed files with 5 additions and 0 deletions
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5
drivers/spi/spi-imx.c
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@ -1268,6 +1268,11 @@ static int spi_imx_probe(struct platform_device *pdev)
goto out_clk_put;
}
if (!master->cs_gpios) {
dev_err(&pdev->dev, "No CS GPIOs available\n");
goto out_clk_put;
}
for (i = 0; i < master->num_chipselect; i++) {
if (!gpio_is_valid(master->cs_gpios[i]))
continue;