dm flakey: fix a bug with 32-bit highmem systems

commit 8eb29c4fbf9661e6bd4dd86197a37ffe0ecc9d50 upstream.

The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 805a70a..335684a 100644 (file)
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio *bio, struct flakey_c *fc)
                        struct page *page = bio_iter_page(bio, iter);
                        if (unlikely(page == ZERO_PAGE(0)))
                                break;
-                       segment = (page_address(page) + bio_iter_offset(bio, iter));
+                       segment = bvec_kmap_local(&bvec);
                        segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+                       kunmap_local(segment);
                        DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
                                "(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
                                bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,