linux-kernel - [PATCH 4.19 123/146] xen/blkfront: fix memory allocation flags in blkfront_setup

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Message-Id: <20200416131259.388834579@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:24:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Roger Pau Monné <roger.pau@...rix.com>
Subject: [PATCH 4.19 123/146] xen/blkfront: fix memory allocation flags in blkfront_setup_indirect()

From: Juergen Gross <jgross@...e.com>

commit 3a169c0be75b59dd85d159493634870cdec6d3c4 upstream.

Commit 1d5c76e664333 ("xen-blkfront: switch kcalloc to kvcalloc for
large array allocation") didn't fix the issue it was meant to, as the
flags for allocating the memory are GFP_NOIO, which will lead the
memory allocation falling back to kmalloc().

So instead of GFP_NOIO use GFP_KERNEL and do all the memory allocation
in blkfront_setup_indirect() in a memalloc_noio_{save,restore} section.

Fixes: 1d5c76e664333 ("xen-blkfront: switch kcalloc to kvcalloc for large array allocation")
Cc: stable@...r.kernel.org
Signed-off-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Acked-by: Roger Pau Monné <roger.pau@...rix.com>
Link: https://lore.kernel.org/r/20200403090034.8753-1-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/xen-blkfront.c |   17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -47,6 +47,7 @@
 #include <linux/bitmap.h>
 #include <linux/list.h>
 #include <linux/workqueue.h>
+#include <linux/sched/mm.h>
 
 #include <xen/xen.h>
 #include <xen/xenbus.h>
@@ -2188,10 +2189,12 @@ static void blkfront_setup_discard(struc
 
 static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
 {
-	unsigned int psegs, grants;
+	unsigned int psegs, grants, memflags;
 	int err, i;
 	struct blkfront_info *info = rinfo->dev_info;
 
+	memflags = memalloc_noio_save();
+
 	if (info->max_indirect_segments == 0) {
 		if (!HAS_EXTRA_REQ)
 			grants = BLKIF_MAX_SEGMENTS_PER_REQUEST;
@@ -2223,7 +2226,7 @@ static int blkfront_setup_indirect(struc
 
 		BUG_ON(!list_empty(&rinfo->indirect_pages));
 		for (i = 0; i < num; i++) {
-			struct page *indirect_page = alloc_page(GFP_NOIO);
+			struct page *indirect_page = alloc_page(GFP_KERNEL);
 			if (!indirect_page)
 				goto out_of_memory;
 			list_add(&indirect_page->lru, &rinfo->indirect_pages);
@@ -2234,15 +2237,15 @@ static int blkfront_setup_indirect(struc
 		rinfo->shadow[i].grants_used =
 			kvcalloc(grants,
 				 sizeof(rinfo->shadow[i].grants_used[0]),
-				 GFP_NOIO);
+				 GFP_KERNEL);
 		rinfo->shadow[i].sg = kvcalloc(psegs,
 					       sizeof(rinfo->shadow[i].sg[0]),
-					       GFP_NOIO);
+					       GFP_KERNEL);
 		if (info->max_indirect_segments)
 			rinfo->shadow[i].indirect_grants =
 				kvcalloc(INDIRECT_GREFS(grants),
 					 sizeof(rinfo->shadow[i].indirect_grants[0]),
-					 GFP_NOIO);
+					 GFP_KERNEL);
 		if ((rinfo->shadow[i].grants_used == NULL) ||
 			(rinfo->shadow[i].sg == NULL) ||
 		     (info->max_indirect_segments &&
@@ -2251,6 +2254,7 @@ static int blkfront_setup_indirect(struc
 		sg_init_table(rinfo->shadow[i].sg, psegs);
 	}
 
+	memalloc_noio_restore(memflags);
 
 	return 0;
 
@@ -2270,6 +2274,9 @@ out_of_memory:
 			__free_page(indirect_page);
 		}
 	}
+
+	memalloc_noio_restore(memflags);
+
 	return -ENOMEM;
 }