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w1: use correct lock on error in w1_seq_show()

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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: d9411e57dc ('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>
This commit is contained in:
Dan Carpenter 2015-06-04 12:04:12 +03:00 committed by Greg Kroah-Hartman
parent a14ef24b07
commit 0c6d5c89a1
1 changed files with 2 additions and 2 deletions
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4
drivers/w1/slaves/w1_therm.c
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@ -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;