[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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 503f09c2f05f..0f9b6c275417 100644
--- 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;