[Minios-devel] [UNIKRAFT PATCH] plat/xen/drivers/blk: Fix freeing zero pages bug in blkfront_ring_fini

[Radu Nicolau <radunicolau102@xxxxxxxxx>]

An assert would cause the blkfront_ring_fini to fail because the function
was freeing zero pages.
Introduced the BLK_NUM_PAGES_RING which defines the number of pages a
ring uses.

Signed-off-by: Radu Nicolau <radunicolau102@xxxxxxxxx>
---
 plat/xen/drivers/blk/blkfront.c | 4 ++--
 plat/xen/drivers/blk/blkfront.h | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/plat/xen/drivers/blk/blkfront.c b/plat/xen/drivers/blk/blkfront.c
index 49d2257..498b3dd 100644
--- a/plat/xen/drivers/blk/blkfront.c
+++ b/plat/xen/drivers/blk/blkfront.c
@@ -562,7 +562,7 @@ static int blkfront_ring_init(struct uk_blkdev_queue *queue)
 
        UK_ASSERT(queue);
        dev = queue->dev;
-       sring = uk_palloc(queue->a, 1);
+       sring = uk_palloc(queue->a, BLK_NUM_PAGES_RING);
        if (!sring)
                return -ENOMEM;
 
@@ -587,7 +587,7 @@ static void blkfront_ring_fini(struct uk_blkdev_queue 
*queue)
        }
 
        if (queue->ring.sring != NULL)
-               uk_pfree(queue->a, queue->ring.sring, 0);
+               uk_pfree(queue->a, queue->ring.sring, BLK_NUM_PAGES_RING);
 }
 
 #if CONFIG_XEN_BLKFRONT_GREFPOOL
diff --git a/plat/xen/drivers/blk/blkfront.h b/plat/xen/drivers/blk/blkfront.h
index 9d2ad67..52a825a 100644
--- a/plat/xen/drivers/blk/blkfront.h
+++ b/plat/xen/drivers/blk/blkfront.h
@@ -52,6 +52,8 @@
 #include <common/gnttab.h>
 #include <common/events.h>
 
+#define BLK_NUM_PAGES_RING 1
+
 #if CONFIG_XEN_BLKFRONT_GREFPOOL
 /**
  * Structure used to describe a list of blkfront_gref elements.
-- 
2.7.4


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