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

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Message-Id: <20190905215356.8168-1-tony@atomide.com>
Date:   Thu,  5 Sep 2019 14:53:56 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     "Andrew F . Davis" <afd@...com>, Dave Gerlach <d-gerlach@...com>,
        Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] 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: 2b2f7def058a ("bus: ti-sysc: Add support for missing clockdomain handling")
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 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;
 	}
 
-- 
2.23.0