diff options
author | Neil Brown <neilb@suse.de> | 2009-09-15 16:05:51 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-14 15:16:25 -0700 |
commit | 83db93f4de2d9ae441a491d1dc61c2204f0195de (patch) | |
tree | 13fb296040c8284cf09f318923aa170212cc245d /fs/hugetlbfs | |
parent | a6a8357788d6a37f8ad0f7eb46b0a386b613abb9 (diff) |
sysfs: Allow sysfs_notify_dirent to be called from interrupt context.
sysfs_notify_dirent is a simple atomic operation that can be used to
alert user-space that new data can be read from a sysfs attribute.
Unfortunately it cannot currently be called from non-process context
because of its use of spin_lock which is sometimes taken with
interrupts enabled.
So change all lockers of sysfs_open_dirent_lock to disable interrupts,
thus making sysfs_notify_dirent safe to be called from non-process
context (as drivers/md does in md_safemode_timeout).
sysfs_get_open_dirent is (documented as being) only called from
process context, so it uses spin_lock_irq. Other places
use spin_lock_irqsave.
The usage for sysfs_notify_dirent in md_safemode_timeout was
introduced in 2.6.28, so this patch is suitable for that and more
recent kernels.
Reported-by: Joel Andres Granados <jgranado@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/hugetlbfs')
0 files changed, 0 insertions, 0 deletions