It is possible for the public functions, tegra_io_rail_power_on/off() to be called before the PMC device has been probed. If this happens then the pmc->clk member will not be initialised and the call to clk_get_rate() in tegra_io_rail_prepare() will return zero and lead to a divide-by-zero exception. The function clk_get_rate() will return zero if a NULl clk pointer is passed. Therefore, rather that checking if pmc->clk is initialised, fix this by checking the return value for clk_get_rate() to make sure it is not zero. Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> --- drivers/soc/tegra/pmc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c index 7792ed88d80b..c99580aabcf6 100644 --- a/drivers/soc/tegra/pmc.c +++ b/drivers/soc/tegra/pmc.c @@ -931,6 +931,8 @@ static int tegra_io_rail_prepare(unsigned int id, unsigned long *request, } rate = clk_get_rate(pmc->clk); + if (!rate) + return -ENODEV; tegra_pmc_writel(DPD_SAMPLE_ENABLE, DPD_SAMPLE); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
