[dm-devel] [2.6.29 PATCH 01] dm table: rework reference counting fix

[Jonathan Brassow]

Reviewed-by: Jonathan Brassow <jbrassow at redhat.com>

  brassow

On Jan 7, 2009, at 7:14 AM, Alasdair G Kergon wrote:

> From: Mikulas Patocka <mpatocka at redhat.com>
>
> Fix an error introduced in dm-table-rework-reference-counting.patch.
>
> When there is failure after table initialization, we need to use
> dm_table_destroy, not dm_table_put, to free the table.
>
> dm_table_put may be used only after dm_table_get.
>
> Cc: Kiyoshi Ueda <k-ueda at ct.jp.nec.com>
> Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
> Signed-off-by: Alasdair G Kergon <agk at redhat.com>
> ---
> drivers/md/dm-ioctl.c |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> Index: linux-2.6.28/drivers/md/dm-ioctl.c
> ===================================================================
> --- linux-2.6.28.orig/drivers/md/dm-ioctl.c	2009-01-06  
> 15:07:04.000000000 +0000
> +++ linux-2.6.28/drivers/md/dm-ioctl.c	2009-01-06 21:36:12.000000000  
> +0000
> @@ -1064,7 +1064,7 @@ static int table_load(struct dm_ioctl *p
>
> 	r = populate_table(t, param, param_size);
> 	if (r) {
> -		dm_table_put(t);
> +		dm_table_destroy(t);
> 		goto out;
> 	}
>
> @@ -1072,7 +1072,7 @@ static int table_load(struct dm_ioctl *p
> 	hc = dm_get_mdptr(md);
> 	if (!hc || hc->md != md) {
> 		DMWARN("device has been removed from the dev hash table.");
> -		dm_table_put(t);
> +		dm_table_destroy(t);
> 		up_write(&_hash_lock);
> 		r = -ENXIO;
> 		goto out;
>
> --
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