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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2015-06-04 11:04:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-13 01:58:33 +0200 |
| commit | 0c6d5c89a112620d2166b8d042d3d69bb42b626c (patch) | |
| tree | 7256aae1b6ba79b7f040bfada4bec7c2e1a673f0 /drivers/w1 | |
| parent | w1: fix for loop exit condition in w1_seq_show() (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 4 |
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; |