[PATCH 6/7] jsflash: handle highmem pages
Christoph Hellwig
hch at lst.de
Wed May 9 06:59:47 PDT 2018
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 at lst.de>
---
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
More information about the linux-mtd
mailing list