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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2006-04-18 03:44:06 -0400
committerJens Axboe <axboe@suse.de>2006-04-18 03:44:06 -0400
commitfba822722e3f9d438fca8fd9541d7ddd447d7a48 (patch)
tree05fc35428f61fb6b66726e3aae03ce9187212c21 /block/ioctl.c
parenta9a5cd5d2a57fb76dbae2115450f777b69beccf7 (diff)
[PATCH 1/2] iosched: fix typo and barrier()
On rmmod path, cfq/as waits to make sure all io-contexts was freed. However, it's using complete(), not wait_for_completion(). I think barrier() is not enough in here. To avoid the following case, this patch replaces barrier() with smb_wmb(). cpu0 visibility cpu1 [ioc_gnone=NULL,ioc_count=1] ioc_gnone = &all_gone NULL,ioc_count=1 atomic_read(&ioc_count) NULL,ioc_count=1 wait_for_completion() NULL,ioc_count=0 atomic_sub_and_test() NULL,ioc_count=0 if ( && ioc_gone) [ioc_gone==NULL, so doesn't call complete()] &all_gone,ioc_count=0 Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/ioctl.c')
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