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author | NeilBrown <neilb@suse.de> | 2012-05-01 11:49:24 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-12 15:27:32 -0700 |
commit | 59d4467be405316916a4087d5b02d99196eeef04 (patch) | |
tree | c6f42a454b2d3e3818c84bb0050a2f920993b1df /include | |
parent | bdd4034df8b37841eeaf7b05f86e732ab8e0b08a (diff) | |
download | linux-59d4467be405316916a4087d5b02d99196eeef04.tar.gz |
w1: introduce a slave mutex for serializing IO
w1 devices need a mutex to serial IO. Most use master->mutex. However that is used for other purposes and they can conflict. In particular master->mutex is held while w1_attach_slave_device is called. For bq27000, this registers a 'powersupply' device which tries to read the current status. The attempt to read will cause a deadlock on master->mutex. So create a new per-slave mutex and use that for serializing IO for bq27000. Signed-off-by: NeilBrown <neilb@suse.de> Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions