linux-kernel - [PATCH 1/7] bq27x00: Do not cache current

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:	Tue, 20 Sep 2011 17:18:47 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	linux-kernel@...r.kernel.org, Anton Vorontsov <cbou@...l.ru>,
	syed rafiuddin <rafiuddin.sayed@...il.com>,
	Rodolfo Giometti <giometti@...ux.it>
Cc:	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 1/7] bq27x00: Do not cache current_now value for bq27000 batery

* This prevent reporting old current_now value for bq27000
* Also ask for current flags, to make sure that current_now will be reported with correct signature
---
 drivers/power/bq27x00_battery.c |   19 +++++--------------
 1 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index bb16f5b..d238144 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -80,8 +80,6 @@ struct bq27x00_reg_cache {
 	int cycle_count;
 	int capacity;
 	int flags;
-
-	int current_now;
 };
 
 struct bq27x00_device_info {
@@ -270,17 +268,12 @@ static void bq27x00_update(struct bq27x00_device_info *di)
 		cache.charge_full = bq27x00_battery_read_lmd(di);
 		cache.cycle_count = bq27x00_battery_read_cyct(di);
 
-		if (!is_bq27500)
-			cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
-
 		/* We only have to read charge design full once */
 		if (di->charge_design_full <= 0)
 			di->charge_design_full = bq27x00_battery_read_ilmd(di);
 	}
 
-	/* Ignore current_now which is a snapshot of the current battery state
-	 * and is likely to be different even between two consecutive reads */
-	if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) {
+	if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 		di->cache = cache;
 		power_supply_changed(&di->bat);
 	}
@@ -330,12 +323,9 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di,
 	union power_supply_propval *val)
 {
 	int curr;
+	int flags;
 
-	if (di->chip == BQ27500)
-	    curr = bq27x00_read(di, BQ27x00_REG_AI, false);
-	else
-	    curr = di->cache.current_now;
-
+	curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 	if (curr < 0)
 		return curr;
 
@@ -343,7 +333,8 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di,
 		/* bq27500 returns signed value */
 		val->intval = (int)((s16)curr) * 1000;
 	} else {
-		if (di->cache.flags & BQ27000_FLAG_CHGS) {
+		flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
+		if (flags & BQ27000_FLAG_CHGS) {
 			dev_dbg(di->dev, "negative current!\n");
 			curr = -curr;
 		}
-- 
1.7.4.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/