[GIT PULL 15/20] lightnvm: proper error handling for pblk_bio_add_pages

From: Matias BjÃrling
Date: Mon May 28 2018 - 05:03:15 EST


From: Igor Konopko <igor.j.konopko@xxxxxxxxx>

Currently in case of error caused by bio_pc_add_page in
pblk_bio_add_pages two issues occur when calling from
pblk_rb_read_to_bio(). First one is in pblk_bio_free_pages, since we
are trying to free pages not allocated from our mempool. Second one
is the warn from dma_pool_free, that we are trying to free NULL
pointer dma.

This commit fix both issues.

Signed-off-by: Igor Konopko <igor.j.konopko@xxxxxxxxx>
Signed-off-by: Marcin Dziegielewski <marcin.dziegielewski@xxxxxxxxx>
Signed-off-by: Matias BjÃrling <mb@xxxxxxxxxxx>
---
drivers/lightnvm/pblk-core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index e43093e27084..a20b41c355c5 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -278,7 +278,9 @@ void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
return;
}

- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
+ if (rqd->meta_list)
+ nvm_dev_dma_free(dev->parent, rqd->meta_list,
+ rqd->dma_meta_list);
mempool_free(rqd, pool);
}

@@ -316,7 +318,7 @@ int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,

return 0;
err:
- pblk_bio_free_pages(pblk, bio, 0, i - 1);
+ pblk_bio_free_pages(pblk, bio, (bio->bi_vcnt - i), i);
return -1;
}

--
2.11.0