diff options
| author | David Fries <David@Fries.net> | 2014-01-16 05:29:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-08 00:40:18 +0100 |
| commit | d3a8a9dbb903c73a7ec2deae4c9b7d74b6834f4c (patch) | |
| tree | 49128d16abf121d8ae8c555a17a1339a09ff7585 /drivers/w1/masters/ds2490.c | |
| parent | w1: format for DocBook and fixes (diff) | |
| download | linux-d3a8a9dbb903c73a7ec2deae4c9b7d74b6834f4c.tar.xz linux-d3a8a9dbb903c73a7ec2deae4c9b7d74b6834f4c.zip | |
w1: hold bus_mutex in netlink and search
The bus_mutex needs to be taken to serialize access to a specific bus.
netlink wasn't updated when bus_mutex was added and was calling
without that lock held, and not all of the masters were holding the
bus_mutex in a search. This was causing the ds2490 hardware to stop
responding when both netlink and /sys slaves were executing bus
commands at the same time.
Signed-off-by: David Fries <David@Fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/masters/ds2490.c')
| -rw-r--r-- | drivers/w1/masters/ds2490.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index db0bf3229bb6..7404ad3062b7 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -727,9 +727,11 @@ static void ds9490r_search(void *data, struct w1_master *master, */ u64 buf[2*64/8]; + mutex_lock(&master->bus_mutex); + /* address to start searching at */ if (ds_send_data(dev, (u8 *)&master->search_id, 8) < 0) - return; + goto search_out; master->search_id = 0; value = COMM_SEARCH_ACCESS | COMM_IM | COMM_RST | COMM_SM | COMM_F | @@ -739,7 +741,7 @@ static void ds9490r_search(void *data, struct w1_master *master, search_limit = 0; index = search_type | (search_limit << 8); if (ds_send_control(dev, value, index) < 0) - return; + goto search_out; do { schedule_timeout(jtime); @@ -791,6 +793,8 @@ static void ds9490r_search(void *data, struct w1_master *master, master->max_slave_count); set_bit(W1_WARN_MAX_COUNT, &master->flags); } +search_out: + mutex_unlock(&master->bus_mutex); } #if 0 |