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authorDan Carpenter <dan.carpenter@oracle.com>2015-06-04 11:04:12 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-06-13 01:58:33 +0200
commit0c6d5c89a112620d2166b8d042d3d69bb42b626c (patch)
tree7256aae1b6ba79b7f040bfada4bec7c2e1a673f0 /drivers/w1/slaves/w1_therm.c
parentw1: fix for loop exit condition in w1_seq_show() (diff)
downloadlinux-0c6d5c89a112620d2166b8d042d3d69bb42b626c.tar.xz
linux-0c6d5c89a112620d2166b8d042d3d69bb42b626c.zip
w1: use correct lock on error in w1_seq_show()
I noticed there was a problem here because Smatch complained: drivers/w1/slaves/w1_therm.c:416 w1_seq_show() warn: inconsistent returns 'mutex:&sl->master->mutex'. Locked on: line 416 Unlocked on: line 413 The problem is that we lock ->mutex but we unlock ->bus_mutex on error. David Fries says that ->bus_mutex is correct and ->mutex is incorrect. Fixes: d9411e57dc7f ('w1: Add support for DS28EA00 sequence to w1-therm') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/slaves/w1_therm.c')
-rw-r--r--drivers/w1/slaves/w1_therm.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 3351be667957..2f029e8f4f95 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -355,7 +355,7 @@ static ssize_t w1_seq_show(struct device *device,
struct w1_reg_num *reg_num;
int seq = 0;
- mutex_lock(&sl->master->mutex);
+ mutex_lock(&sl->master->bus_mutex);
/* Place all devices in CHAIN state */
if (w1_reset_bus(sl->master))
goto error;
@@ -407,7 +407,7 @@ static ssize_t w1_seq_show(struct device *device,
ack = w1_read_8(sl->master);
if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
goto error;
- mutex_unlock(&sl->master->mutex);
+ mutex_unlock(&sl->master->bus_mutex);
c -= snprintf(buf + PAGE_SIZE - c, c, "%d\n", seq);
return PAGE_SIZE - c;