diff options
Diffstat (limited to 'drivers/w1/w1.c')
| -rw-r--r-- | drivers/w1/w1.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index bfb898641029..1a574370d2cd 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -885,16 +885,21 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb * * Return 0 - device(s) present, 1 - no devices present. */ + mutex_lock(&dev->bus_mutex); if (w1_reset_bus(dev)) { + mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "No devices present on the wire.\n"); break; } /* Do fast search on single slave bus */ if (dev->max_slave_count == 1) { + int rv; w1_write_8(dev, W1_READ_ROM); + rv = w1_read_block(dev, (u8 *)&rn, 8); + mutex_unlock(&dev->bus_mutex); - if (w1_read_block(dev, (u8 *)&rn, 8) == 8 && rn) + if (rv == 8 && rn) cb(dev, rn); break; @@ -927,10 +932,12 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb rn |= (tmp64 << i); if (kthread_should_stop()) { + mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "Abort w1_search\n"); return; } } + mutex_unlock(&dev->bus_mutex); if ( (triplet_ret & 0x03) != 0x03 ) { if ( (desc_bit == last_zero) || (last_zero < 0)) |