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dm io: delay dec_count 

Delay decrementing the 'struct io' reference count until after the bio has
been freed so that a bio destructor function may reference it.  Required by a
later patch.

Signed-off-by: Heinz Mauelshagen <hjm@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Milan Broz <mbroz@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:
Heinz Mauelshagen 2007-05-09 02:33:00 -07:00 committed by Linus Torvalds
parent a8e6afa236
commit c897feb3dc
1 changed files with 10 additions and 2 deletions
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12
drivers/md/dm-io.c
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@ -126,7 +126,8 @@ static void dec_count(struct io *io, unsigned int region, int error)
static int endio(struct bio *bio, unsigned int done, int error)
{
struct io *io = (struct io *) bio->bi_private;
struct io *io;
unsigned region;
/* keep going until we've finished */
if (bio->bi_size)
@ -135,10 +136,17 @@ static int endio(struct bio *bio, unsigned int done, int error)
if (error && bio_data_dir(bio) == READ)
zero_fill_bio(bio);
dec_count(io, bio_get_region(bio), error);
/*
* The bio destructor in bio_put() may use the io object.
*/
io = bio->bi_private;
region = bio_get_region(bio);
bio->bi_max_vecs++;
bio_put(bio);
dec_count(io, region, error);
return 0;
}