Commit 2783d063 authored Sep 05, 2019 by Tony Lindgren

bus: ti-sysc: Fix handling of invalid clocks



We can currently get "Unable to handle kernel paging request at
virtual address" for invalid clocks with dts node but no driver:

(__clk_get_hw) from [<c0138ebc>] (ti_sysc_find_one_clockdomain+0x18/0x34)
(ti_sysc_find_one_clockdomain) from [<c0138f0c>] (ti_sysc_clkdm_init+0x34/0xdc)
(ti_sysc_clkdm_init) from [<c0584660>] (sysc_probe+0xa50/0x10e8)
(sysc_probe) from [<c065c6ac>] (platform_drv_probe+0x58/0xa8)

Let's add IS_ERR checks to ti_sysc_clkdm_init() as And let's start treating
clk_get() with -ENOENT as a proper error. If the clock name is specified
in device tree we must succeed with clk_get() to continue. For modules with
no clock names specified in device tree we will just ignore the clocks.

Fixes: 2b2f7def ("bus: ti-sysc: Add support for missing clockdomain handling")
Acked-by: Roger Quadros <rogerq@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

parent d098913a

arch/arm/mach-omap2/pdata-quirks.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -491,11 +491,11 @@ static int ti_sysc_clkdm_init(struct device *dev,
		struct clk fck, struct clk ick,
		struct ti_sysc_cookie *cookie)
		{
		if (fck)
		if (!IS_ERR(fck))
		cookie->clkdm = ti_sysc_find_one_clockdomain(fck);
		if (cookie->clkdm)
		return 0;
		if (ick)
		if (!IS_ERR(ick))
		cookie->clkdm = ti_sysc_find_one_clockdomain(ick);
		if (cookie->clkdm)
		return 0;

drivers/bus/ti-sysc.c

+1 −4

Original line number	Diff line number	Diff line
		@@ -280,9 +280,6 @@ static int sysc_get_one_clock(struct sysc ddata, const char name)

		ddata->clocks[index] = devm_clk_get(ddata->dev, name);
		if (IS_ERR(ddata->clocks[index])) {
		if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
		return 0;

		dev_err(ddata->dev, "clock get error for %s: %li\n",
		name, PTR_ERR(ddata->clocks[index]));

		@@ -357,7 +354,7 @@ static int sysc_get_clocks(struct sysc *ddata)
		continue;

		error = sysc_get_one_clock(ddata, name);
		if (error && error != -ENOENT)
		if (error)
		return error;
		}