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author | Alan Jenkins <alan-jenkins@tuffmail.co.uk> | 2009-07-29 21:07:55 +0200 |
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committer | Rafael J. Wysocki <rjw@sisk.pl> | 2009-07-29 21:07:55 +0200 |
commit | dddac6a7b445de95515f64fdf82fe5dc36c02f26 (patch) | |
tree | 39651610292d6b0c17f210f253a0dd16b022727d /lib/kref.c | |
parent | ec79be26875f6c1468784876cb99192b7f41c7a5 (diff) | |
download | op-kernel-dev-dddac6a7b445de95515f64fdf82fe5dc36c02f26.zip op-kernel-dev-dddac6a7b445de95515f64fdf82fe5dc36c02f26.tar.gz |
PM / Hibernate: Replace bdget call with simple atomic_inc of i_count
Create bdgrab(). This function copies an existing reference to a
block_device. It is safe to call from any context.
Hibernation code wishes to copy a reference to the active swap device.
Right now it calls bdget() under a spinlock, but this is wrong because
bdget() can sleep. It doesn't need a full bdget() because we already
hold a reference to active swap devices (and the spinlock protects
against swapoff).
Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'lib/kref.c')
0 files changed, 0 insertions, 0 deletions