Just kmap the bio single page payload before processing it. (and yes, now highmem on sparc32 anyway, but kmap_(un)map atomic are nops, so this gives the right example) Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- drivers/sbus/char/jsflash.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c index 14f377ac1280..8520587b8d09 100644 --- a/drivers/sbus/char/jsflash.c +++ b/drivers/sbus/char/jsflash.c @@ -215,6 +215,7 @@ static void jsfd_request(void) unsigned long offset = blk_rq_pos(req) << 9; size_t len = blk_rq_cur_bytes(req); blk_status_t err = BLK_STS_IOERR; + void *p; if ((offset + len) > jdp->dsize) goto end; @@ -229,7 +230,9 @@ static void jsfd_request(void) goto end; } - jsfd_read(bio_data(req->bio), jdp->dbase + offset, len); + p = kmap_atomic(bio_page(bio)) + bio_offset(bio); + jsfd_read(p, jdp->dbase + offset, len); + kunmap_atomic(p); err = BLK_STS_OK; end: if (!__blk_end_request_cur(req, err)) @@ -592,7 +595,6 @@ static int jsfd_init(void) put_disk(disk); goto out; } - blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH); jsfd_disk[i] = disk; } -- 2.17.0
