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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tero Kristo <t-kristo@ti.com>,
        Tony Lindgren <tony@atomide.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.0 014/246] clk: ti: clkctrl: Fix clkdm_name regression for TI_CLK_CLKCTRL_COMPAT
Date:   Thu,  4 Apr 2019 10:45:14 +0200
Message-Id: <20190404084619.690847928@linuxfoundation.org>
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5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit d17a718db40df2548e99a62dc3d7e5e2b38143cc ]

Commit a72d785021cb ("clk: ti: Prepare for remove of OF node name")
changed the code to use kasprintf() for provider->clkdm_name but also
changed the offset used later on by three. We don't need to change the
offset as we already have the extra three characters in the format for
kasprintf with "%pOFnxxx".

This caused the clocks with TI_CLK_CLKCTRL_COMPAT to have NULL
clk->clkdm_name for omap4 and 5. And null clkdm_name can cause module
reset, enable, and idle to fail.

The issue can also be seen also when enabling DEBUG for clkctrl.c
and then we start seeing "clock: could not associate" messages for
omap4 and 5 as the generated name is something like "l4_wkclkdm" instead
of "l4_wkup_clkdm" that's needed.

Let's fix the issue with a partial revert of commit a72d785021cb ("clk:
ti: Prepare for remove of OF node name").

ALso note that in general code should not depend on the dts node names.
And the node names should be generic types like clock-domain in this case.
This could be fixed later by using separate compatible properties for the
clockdomains, or by adding soc_device_match() table with reg offsets
to the driver. But let's fix the regression first.

Fixes: a72d785021cb ("clk: ti: Prepare for remove of OF node name")
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/clk/ti/clkctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c
index 40630eb950fc..85d7f301149b 100644
--- a/drivers/clk/ti/clkctrl.c
+++ b/drivers/clk/ti/clkctrl.c
@@ -530,7 +530,7 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		 * Create default clkdm name, replace _cm from end of parent
 		 * node name with _clkdm
 		 */
-		provider->clkdm_name[strlen(provider->clkdm_name) - 5] = 0;
+		provider->clkdm_name[strlen(provider->clkdm_name) - 2] = 0;
 	} else {
 		provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFn", node);
 		if (!provider->clkdm_name) {
-- 
2.19.1