linux-kernel - [PATCH 02/10] extcon: arizona: Make rev A register sequences atomic

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20191209110916.29524-2-ckeepax@opensource.cirrus.com>
Date:   Mon, 9 Dec 2019 11:09:08 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <cw00.choi@...sung.com>
CC:     <myungjoo.ham@...sung.com>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/10] extcon: arizona: Make rev A register sequences atomic

The special register sequences that are applied for rev A of wm5102
should be applied atomically with respect to any other register writes.
Use regmap_multi_reg_write to ensure all writes happen under the regmap
lock.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 drivers/extcon/extcon-arizona.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 79e9a24101823..a8b0bc2d4323b 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -310,9 +310,13 @@ static void arizona_start_mic(struct arizona_extcon_info *info)
 	}
 
 	if (info->micd_reva) {
-		regmap_write(arizona->regmap, 0x80, 0x3);
-		regmap_write(arizona->regmap, 0x294, 0);
-		regmap_write(arizona->regmap, 0x80, 0x0);
+		const struct reg_sequence reva[] = {
+			{ 0x80,  0x3 },
+			{ 0x294, 0x0 },
+			{ 0x80,  0x0 },
+		};
+
+		regmap_multi_reg_write(arizona->regmap, reva, ARRAY_SIZE(reva));
 	}
 
 	if (info->detecting && arizona->pdata.micd_software_compare)
@@ -361,9 +365,13 @@ static void arizona_stop_mic(struct arizona_extcon_info *info)
 	snd_soc_dapm_sync(dapm);
 
 	if (info->micd_reva) {
-		regmap_write(arizona->regmap, 0x80, 0x3);
-		regmap_write(arizona->regmap, 0x294, 2);
-		regmap_write(arizona->regmap, 0x80, 0x0);
+		const struct reg_sequence reva[] = {
+			{ 0x80,  0x3 },
+			{ 0x294, 0x2 },
+			{ 0x80,  0x0 },
+		};
+
+		regmap_multi_reg_write(arizona->regmap, reva, ARRAY_SIZE(reva));
 	}
 
 	ret = regulator_allow_bypass(info->micvdd, true);
-- 
2.11.0