SG: clear termination bit in sg_chain()

Since we are using the last entry in the list, clear any possible
termination bit that may have already been set. Pointed out by Rusty.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 457123171389..b2ec8421b89f 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -179,7 +179,11 @@ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
 #ifndef ARCH_HAS_SG_CHAIN
         BUG();
 #endif
-        prv[prv_nents - 1].page_link = (unsigned long) sgl | 0x01;
+        /*
+         * Set lowest bit to indicate a link pointer, and make sure to clear
+         * the termination bit if it happens to be set.
+         */
+        prv[prv_nents - 1].page_link = ((unsigned long) sgl | 0x01) & ~0x02;
 }
 
 /**