On Thu, Oct 20 2016 at 9:35pm -0400,
tang.junhui@xxxxxxxxxx <tang.junhui@xxxxxxxxxx> wrote:
> From: "tang.junhui" <tang.junhui@xxxxxxxxxx>
>
> tgt->type should be putted in dm_table_add_target()
> when the target do not statisfy the needs of target type,
> otherwise it would cause the module reference count
> of this target type leakage.
>
> Signed-off-by: tang.junhui <tang.junhui@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
This issue, missing dm_put_target_type, dates back to 2011.
See these 3 commits:
$ git log --oneline 3791e2fc0^..36a0456fb
36a0456 dm table: add immutable feature
cc6cbe1 dm table: add always writeable feature
3791e2f dm table: add singleton feature
So are you having problems with failed DM table loads (due to the errors
below) resulting in the inability to unload a DM module?
(BTW, you don't need to cc stable when initially proposing a patch for
stable. The stable@ maintainers will automatically pull such stable@
changes in once they land in Linus' tree.)
Mike
> ---
> drivers/md/dm-table.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 6554d91..4f56c38 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -698,30 +698,30 @@ int dm_table_add_target(struct dm_table *t, const char *type,
>
> if (dm_target_needs_singleton(tgt->type)) {
> if (t->num_targets) {
> - DMERR("%s: target type %s must appear alone in table",
> - dm_device_name(t->md), type);
> - return -EINVAL;
> + tgt->error = "target type must appear alone in table";
> + r = -EINVAL;
> + goto bad;
> }
> t->singleton = 1;
> }
>
> if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
> - DMERR("%s: target type %s may not be included in read-only tables",
> - dm_device_name(t->md), type);
> - return -EINVAL;
> + tgt->error = "target type may not be included in read-only tables";
> + r = -EINVAL;
> + goto bad;
> }
>
> if (t->immutable_target_type) {
> if (t->immutable_target_type != tgt->type) {
> - DMERR("%s: immutable target type %s cannot be mixed with other target types",
> - dm_device_name(t->md), t->immutable_target_type->name);
> - return -EINVAL;
> + tgt->error = "immutable target type cannot be mixed with other target types";
> + r = -EINVAL;
> + goto bad;
> }
> } else if (dm_target_is_immutable(tgt->type)) {
> if (t->num_targets) {
> - DMERR("%s: immutable target type %s cannot be mixed with other target types",
> - dm_device_name(t->md), tgt->type->name);
> - return -EINVAL;
> + tgt->error = "immutable target type cannot be mixed with other target types";
> + r = -EINVAL;
> + goto bad;
> }
> t->immutable_target_type = tgt->type;
> }
> --
> 2.8.1.windows.1
>
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