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authorCheng Renquan <crquan@gmail.com>2009-04-02 19:55:27 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-04-02 19:55:27 +0100
commit5642b8a61a15436231adf27b2b1bd96901b623dd (patch)
tree2108366dbec955f71bc49795e3cf894d4dcd991c /drivers/md/dm-target.c
parent35bf659b008e83e725dcd30f542e38461dbb867c (diff)
downloadop-kernel-dev-5642b8a61a15436231adf27b2b1bd96901b623dd.zip
op-kernel-dev-5642b8a61a15436231adf27b2b1bd96901b623dd.tar.gz
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>
Diffstat (limited to 'drivers/md/dm-target.c')
-rw-r--r--drivers/md/dm-target.c20
1 files changed, 3 insertions, 17 deletions
diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 7decf10..db72c94 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);
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