ide: palm_bk3710: test clock rate to avoid division by 0

The clk API may return 0 on clk_get_rate, so we should check the result before
using it as a divisor.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ide/palm_bk3710.c b/drivers/ide/palm_bk3710.c
index 8012e43bf8f6188f2fe3173194f958821992090d..46427ea01753b4c84f9670939347f06cc65bbfbe 100644 (file)
--- a/drivers/ide/palm_bk3710.c
+++ b/drivers/ide/palm_bk3710.c
@@ -325,6 +325,8 @@ static int __init palm_bk3710_probe(struct platform_device *pdev)
 
        clk_enable(clk);
        rate = clk_get_rate(clk);
+       if (!rate)
+               return -EINVAL;
 
        /* NOTE:  round *down* to meet minimum timings; we count in clocks */
        ideclk_period = 1000000000UL / rate;