mmc: sdhci-s3c: add spin_unlock_irq() before calling clk_round_rate

Before calling clk_round_rate(), put the spin_unlock_irq() in
sdhci_s3c_consider_clock() function.

Signed-off-by: Jaehoon Chung <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-s3c.c

···
 	 * speed possible with selected clock source and skip the division.
 	 */
 	if (ourhost->no_divider) {
+		spin_unlock_irq(&ourhost->host->lock);
 		rate = clk_round_rate(clksrc, wanted);
+		spin_lock_irq(&ourhost->host->lock);
 		return wanted - rate;
 	}