ARM: OMAP2+: Fix ti_sysc_find_one_clockdomain to check for to_clk_hw_omap

commit 90bdfa0b05e3cc809a7c1aa3b1f162b46ea1b330 upstream.

We must bail out early if the clock is not hw_omap. Otherwise we will
try to access invalid address with hwclk->clkdm_name:

Unable to handle kernel paging request at virtual address ffffffff
Internal error: Oops: 27 [#1] ARM
...
(strcmp) from [<c011b348>] (clkdm_lookup+0x40/0x60)
[<c011b348>] (clkdm_lookup) from [<c011cb84>] (ti_sysc_clkdm_init+0x5c/0x64)
[<c011cb84>] (ti_sysc_clkdm_init) from [<c03680a8>] (sysc_probe+0x948/0x117c)
[<c03680a8>] (sysc_probe) from [<c03d0af4>] (platform_drv_probe+0x48/0x98)
...

Fixes: 2b2f7def058a ("bus: ti-sysc: Add support for missing clockdomain handling")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
index 1b7cf81..33688e1 100644 (file)
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -368,10 +368,14 @@ static void __init dra7x_evm_mmc_quirk(void)
 
 static struct clockdomain *ti_sysc_find_one_clockdomain(struct clk *clk)
 {
+       struct clk_hw *hw = __clk_get_hw(clk);
        struct clockdomain *clkdm = NULL;
        struct clk_hw_omap *hwclk;
 
-       hwclk = to_clk_hw_omap(__clk_get_hw(clk));
+       hwclk = to_clk_hw_omap(hw);
+       if (!omap2_clk_is_hw_omap(hw))
+               return NULL;
+
        if (hwclk && hwclk->clkdm_name)
                clkdm = clkdm_lookup(hwclk->clkdm_name);