LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Lee Jones <lee.jones@linaro.org>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH v2] mfd: tps65911-comparator: Fix an off by one bug
Date: Fri, 20 Apr 2018 12:09:10 +0300	[thread overview]
Message-ID: <20180420090910.GA26071@mwanda> (raw)
In-Reply-To: <20180420083909.66a6t63s5q6vpwp7@dell>

The COMP1 and COMP2 elements are in 0 and 1 respectively so this code is
accessing the wrong elements and one space beyond the end of the array.
We should be using "id - 1" instead.

The "id" variable is never COMP (0) so that code can be removed.

Fixes: 6851ad3ab346 ("TPS65911: Comparator: Add comparator driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: we can fix the bug and save memory.

diff --git a/drivers/mfd/tps65911-comparator.c b/drivers/mfd/tps65911-comparator.c
index c0789f81a1c5..887409c3938d 100644
--- a/drivers/mfd/tps65911-comparator.c
+++ b/drivers/mfd/tps65911-comparator.c
@@ -22,7 +22,6 @@
 #include <linux/gpio.h>
 #include <linux/mfd/tps65910.h>
 
-#define COMP					0
 #define COMP1					1
 #define COMP2					2
 
@@ -58,14 +57,11 @@ static struct comparator tps_comparators[] = {
 
 static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
 {
-	struct comparator tps_comp = tps_comparators[id];
+	struct comparator tps_comp = tps_comparators[id - 1];
 	int curr_voltage = 0;
 	int ret;
 	u8 index = 0, val;
 
-	if (id == COMP)
-		return 0;
-
 	while (curr_voltage < tps_comp.uV_max) {
 		curr_voltage = tps_comp.vsel_table[index];
 		if (curr_voltage >= voltage)
@@ -85,13 +81,10 @@ static int comp_threshold_set(struct tps65910 *tps65910, int id, int voltage)
 
 static int comp_threshold_get(struct tps65910 *tps65910, int id)
 {
-	struct comparator tps_comp = tps_comparators[id];
+	struct comparator tps_comp = tps_comparators[id - 1];
 	int ret;
 	u8 val;
 
-	if (id == COMP)
-		return 0;
-
 	ret = tps65910->read(tps65910, tps_comp.reg, 1, &val);
 	if (ret < 0)
 		return ret;

  parent reply	other threads:[~2018-04-20  9:09 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-19 13:46 [PATCH] " Dan Carpenter
2018-04-20  8:09 ` Lee Jones
2018-04-20  8:21   ` Dan Carpenter
2018-04-20  8:24     ` Dan Carpenter
2018-04-20  8:39     ` Lee Jones
2018-04-20  9:01       ` Dan Carpenter
2018-04-23  6:26         ` Lee Jones
2018-04-20  9:09       ` Dan Carpenter [this message]
2018-04-23  6:44         ` [PATCH v2] " Lee Jones
2018-04-23 10:27           ` Dan Carpenter
2018-04-24  5:45             ` Lee Jones
2018-04-20  8:59 ` [PATCH] " Dan Carpenter
2018-04-20  9:21   ` [PATCH] mfd: tps65911-comparator: Fix a build error Dan Carpenter
2018-04-23 18:13     ` Rhyland Klein
2018-04-24  5:46     ` Lee Jones

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180420090910.GA26071@mwanda \
    --to=dan.carpenter@oracle.com \
    --cc=kernel-janitors@vger.kernel.org \
    --cc=lee.jones@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH v2] mfd: tps65911-comparator: Fix an off by one bug' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).