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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: 2b2f7def05 ("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>
This commit is contained in:
Tony Lindgren 2019-09-05 13:01:29 -07:00
parent d098913a10
commit 2783d0638a
2 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/mach-omap2/pdata-quirks.c
View File

@ -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;

5
drivers/bus/ti-sysc.c
View File

@ -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;
}