To fix scheduling while atomic happening in sdhci_s3c_set_clock() caused by calling clk_get_rate() that might sleep, this patch modifies the driver to cache rates of all bus clocks at probe time and then only use those cache values. Signed-off-by: Tomasz Figa <tomasz.figa@xxxxxxxxx> --- drivers/mmc/host/sdhci-s3c.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c index 52770d5..9b78391 100644 --- a/drivers/mmc/host/sdhci-s3c.c +++ b/drivers/mmc/host/sdhci-s3c.c @@ -57,6 +57,7 @@ struct sdhci_s3c { struct clk *clk_io; struct clk *clk_bus[MAX_BUS_CLK]; + unsigned long clk_rates[MAX_BUS_CLK]; }; /** @@ -158,7 +159,7 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost, return wanted - rate; } - rate = clk_get_rate(clksrc); + rate = ourhost->clk_rates[src]; for (shift = 0; shift < 8; ++shift) { if ((rate >> shift) <= wanted) @@ -215,7 +216,7 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock) writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL); ourhost->cur_clk = best_src; - host->max_clk = clk_get_rate(clk); + host->max_clk = ourhost->clk_rates[best_src]; ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2); ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK; @@ -583,8 +584,10 @@ static int sdhci_s3c_probe(struct platform_device *pdev) */ sc->cur_clk = ptr; + sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]); + dev_info(dev, "clock source %d: %s (%ld Hz)\n", - ptr, name, clk_get_rate(clk)); + ptr, name, sc->clk_rates[ptr]); } if (clks == 0) { -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html