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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2014-04-07 15:38:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:36:02 -0700 |
| commit | d61f98c70e8b0d324e8e83be2ed546d6295e63f3 (patch) | |
| tree | ef4c07ad1d867c0ad97d0478decd78ba209a9387 | |
| parent | 6e76668e415adf799839f0ab205142ad7002d260 (diff) | |
| download | linux-d61f98c70e8b0d324e8e83be2ed546d6295e63f3.tar.gz linux-d61f98c70e8b0d324e8e83be2ed546d6295e63f3.tar.bz2 linux-d61f98c70e8b0d324e8e83be2ed546d6295e63f3.zip | |
zram: move comp allocation out of init_lock
While fixing lockdep spew of ->init_lock reported by Sasha Levin [1],
Minchan Kim noted [2] that it's better to move compression backend
allocation (using GPF_KERNEL) out of the ->init_lock lock, same way as
with zram_meta_alloc(), in order to prevent the same lockdep spew.
[1] https://lkml.org/lkml/2014/2/27/337
[2] https://lkml.org/lkml/2014/3/3/32
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reported-by: Minchan Kim <minchan@kernel.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 15d46f2e158c..e4d536b485e6 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -580,9 +580,10 @@ static ssize_t disksize_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { u64 disksize; + struct zcomp *comp; struct zram_meta *meta; struct zram *zram = dev_to_zram(dev); - int err; + int err = -EINVAL; disksize = memparse(buf, NULL); if (!disksize) @@ -593,30 +594,32 @@ static ssize_t disksize_store(struct device *dev, if (!meta) return -ENOMEM; + comp = zcomp_create(zram->compressor, zram->max_comp_streams); + if (!comp) { + pr_info("Cannot initialise %s compressing backend\n", + zram->compressor); + goto out_cleanup; + } + down_write(&zram->init_lock); if (init_done(zram)) { + up_write(&zram->init_lock); pr_info("Cannot change disksize for initialized device\n"); err = -EBUSY; - goto out_free_meta; - } - - zram->comp = zcomp_create(zram->compressor, zram->max_comp_streams); - if (!zram->comp) { - pr_info("Cannot initialise %s compressing backend\n", - zram->compressor); - err = -EINVAL; - goto out_free_meta; + goto out_cleanup; } zram->meta = meta; + zram->comp = comp; zram->disksize = disksize; set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); up_write(&zram->init_lock); return len; -out_free_meta: - up_write(&zram->init_lock); +out_cleanup: + if (comp) + zcomp_destroy(comp); zram_meta_free(meta); return err; } |