[SCSI] scsi_kmap_atomic_sg(): check that local irqs are disabled

The KM_BIO_SRC_IRQ kmap slot must be taken with local irqs disabled.  Add a
check into scsi for this.

Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 503f09c2f05fb64b19d254cbb82bcf2632750590..0f9b6c2754177e44026b925440f52cfd85de73ac 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2250,6 +2250,8 @@ void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
        size_t sg_len = 0, len_complete = 0;
        struct page *page;
 
+       WARN_ON(!irqs_disabled());
+
        for (i = 0; i < sg_count; i++) {
                len_complete = sg_len; /* Complete sg-entries */
                sg_len += sg[i].length;