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zram: move comp allocation out of init_lock

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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>
This commit is contained in:
Sergey Senozhatsky 2014-04-07 15:38:19 -07:00 committed by Linus Torvalds
parent 6e76668e41
commit d61f98c70e
1 changed files with 17 additions and 14 deletions
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31
drivers/block/zram/zram_drv.c
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@ -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;
down_write(&zram->init_lock);
if (init_done(zram)) {
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) {
comp = zcomp_create(zram->compressor, zram->max_comp_streams);
if (!comp) {
pr_info("Cannot initialise %s compressing backend\n",
zram->compressor);
err = -EINVAL;
goto out_free_meta;
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_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;
}