From c897feb3dcf3c3300849056ee82b01df7bf66d3c Mon Sep 17 00:00:00 2001 From: Heinz Mauelshagen Date: Wed, 9 May 2007 02:33:00 -0700 Subject: [PATCH] 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 Signed-off-by: Alasdair G Kergon Cc: Milan Broz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/dm-io.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 8bdc8a87b249..4d19c45158b4 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -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; } -- 2.20.1