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| author | john stultz <johnstul@us.ibm.com> | 2010-05-12 17:52:14 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-05-13 14:05:54 +0200 |
| commit | d6434af22679ec15d7779f3f41a5d3aebbb704e3 (patch) | |
| tree | cdca7945b1c1780a13542809c5d74ec144ae2ea5 /Documentation/dvb | |
| parent | 56e4c7f24a6c08f2cce086f14ca5bf1772bb6d6f (diff) | |
| download | lwn-d6434af22679ec15d7779f3f41a5d3aebbb704e3.tar.gz lwn-d6434af22679ec15d7779f3f41a5d3aebbb704e3.zip | |
fs: Resolve mntput_no_expire issues.
In testing the mnt_count typo fix, I hit a few BUG_ON/WARN_ON messages
in the mntput_no_expire code.
The first issue was a race against the MNT_MOUNTED flag, where if after
the optimistic lock free check is done, someone changes the value, we
might BUG_ON after getting the lock. The fix is after getting the lock,
re-check the MNT_MOUNTED bit and drop the lock and try again if its
changed.
The second issue was a call to smp_processor_id() in add_mnt_count()
that was done while preemptable. This was missed in my earlier commit
070976b5b038218900648ea4cc88786d5dfcd58d.
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Darren Hart <dvhltc@us.ibm.com>
Cc: Nick Piggin <npiggin@suse.de>
LKML-Reference: <1273711934.2856.22.camel@localhost.localdomain>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/dvb')
0 files changed, 0 insertions, 0 deletions