Re: [PATCH] bus: ti-sysc: Fix handling of invalid clocks

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On 06/09/19 3:23 AM, Tony Lindgren wrote:
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.

Tested for DS0 and RTC+DDR modes on AM437x

FWIW
Tested-by: Keerthy <j-keerthy@xxxxxx>


Fixes: 2b2f7def058a ("bus: ti-sysc: Add support for missing clockdomain handling")
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
  arch/arm/mach-omap2/pdata-quirks.c | 4 ++--
  drivers/bus/ti-sysc.c              | 5 +----
  2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -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;
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -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;
  	}



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