tree 756f42e02e8ca03891f7f2c01bb28405a27528b4
parent c3098356927254be270e5dc186a2ca144b64463b
author David Fries <David@Fries.net> 1431132710 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1432494539 -0700

w1_therm reference count family data

A temperature conversion can take 750 ms and when possible the
w1_therm slave driver drops the bus_mutex to allow other bus
operations, but that includes operations such as a periodic slave
search, which can remove this slave when it is no longer detected.
If that happens the sl->family_data will be freed and set to NULL
causing w1_slave_show to crash when it wakes up.

Signed-off-by: David Fries <David@Fries.net>
Reported-By: Thorsten Bschorr <thorsten@bschorr.de>
Tested-by: Thorsten Bschorr <thorsten@bschorr.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>