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author | NeilBrown <neilb@suse.de> | 2012-05-01 20:49:24 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-13 00:27:32 +0200 |
commit | 59d4467be405316916a4087d5b02d99196eeef04 (patch) | |
tree | c6f42a454b2d3e3818c84bb0050a2f920993b1df /net/nfc | |
parent | driver core: always handle dpm_order (diff) | |
download | linux-59d4467be405316916a4087d5b02d99196eeef04.tar.xz linux-59d4467be405316916a4087d5b02d99196eeef04.zip |
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 'net/nfc')
0 files changed, 0 insertions, 0 deletions