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| author | Cheng Renquan <crquan@gmail.com> | 2009-04-02 19:55:27 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-04-02 19:55:27 +0100 |
| commit | 5642b8a61a15436231adf27b2b1bd96901b623dd (patch) | |
| tree | 2108366dbec955f71bc49795e3cf894d4dcd991c | |
| parent | 35bf659b008e83e725dcd30f542e38461dbb867c (diff) | |
| download | linux-3.10-5642b8a61a15436231adf27b2b1bd96901b623dd.tar.gz linux-3.10-5642b8a61a15436231adf27b2b1bd96901b623dd.tar.bz2 linux-3.10-5642b8a61a15436231adf27b2b1bd96901b623dd.zip | |
dm target: use module refcount directly
The tt_internal's 'use' field is superfluous: the module's refcount can do
the work properly. An acceptable side-effect is that this increases the
reference counts reported by 'lsmod'.
Remove the superfluous test when removing a target module.
[Crash possible without this on SMP - agk]
Cc: stable@kernel.org
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Reviewed-by: Alasdair G Kergon <agk@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
| -rw-r--r-- | drivers/md/dm-target.c | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c index 7decf10006e..db72c9497bb 100644 --- a/drivers/md/dm-target.c +++ b/drivers/md/dm-target.c @@ -18,7 +18,6 @@ struct tt_internal { struct target_type tt; struct list_head list; - long use; }; static LIST_HEAD(_targets); @@ -44,12 +43,8 @@ static struct tt_internal *get_target_type(const char *name) down_read(&_lock); ti = __find_target_type(name); - if (ti) { - if ((ti->use == 0) && !try_module_get(ti->tt.module)) - ti = NULL; - else - ti->use++; - } + if (ti && !try_module_get(ti->tt.module)) + ti = NULL; up_read(&_lock); return ti; @@ -77,10 +72,7 @@ void dm_put_target_type(struct target_type *t) struct tt_internal *ti = (struct tt_internal *) t; down_read(&_lock); - if (--ti->use == 0) - module_put(ti->tt.module); - - BUG_ON(ti->use < 0); + module_put(ti->tt.module); up_read(&_lock); return; @@ -140,12 +132,6 @@ void dm_unregister_target(struct target_type *t) BUG(); } - if (ti->use) { - DMCRIT("Attempt to unregister target still in use: %s", - t->name); - BUG(); - } - list_del(&ti->list); kfree(ti); |