linux-kernel - [PATCH] clk: meson: vid-pll-div: remove warning and return 0 on invalid config

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 27 Mar 2019 16:13:48 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     jbrunet@...libre.com
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: meson: vid-pll-div: remove warning and return 0 on invalid config

The vid_pll_div is a programmable fractional divider, but vendor gives a
limited of known configuration value and it's corresponding fraction.

Thus when at reset value (0) or unknown value, we cannot determine the
result rate.

The initial behaviour was to print a warning, but the warning triggers
at each boot and when the clock tree is refreshed.

This patch moves the print to debug and returns 0 instead of the
parent rate.

Fixes: 72dbb8c94d0d ("clk: meson: Add vid_pll divider driver")
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/clk/meson/vid-pll-div.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/meson/vid-pll-div.c b/drivers/clk/meson/vid-pll-div.c
index 08bcc01c0923..daff235bc763 100644
--- a/drivers/clk/meson/vid-pll-div.c
+++ b/drivers/clk/meson/vid-pll-div.c
@@ -82,8 +82,8 @@ static unsigned long meson_vid_pll_div_recalc_rate(struct clk_hw *hw,
 	div = _get_table_val(meson_parm_read(clk->map, &pll_div->val),
 			     meson_parm_read(clk->map, &pll_div->sel));
 	if (!div || !div->divider) {
-		pr_info("%s: Invalid config value for vid_pll_div\n", __func__);
-		return parent_rate;
+		pr_debug("%s: Invalid config value for vid_pll_div\n", __func__);
+		return 0;
 	}
 
 	return DIV_ROUND_UP_ULL(parent_rate * div->multiplier, div->divider);
-- 
2.21.0