From: Christoph Hellwig <hch@lst.de>
Date: Wed, 14 Aug 2019 09:59:20 +0200
Subject: nouveau: reset dma_nr in nouveau_dmem_migrate_alloc_and_copy
Git-commit: dea027f28209aa7a23a4e56b2ae270f16d48055d
Patch-mainline: v5.4-rc1
References: jsc#SLE-16387, bsc#1152489

When we start a new batch of dma_map operations we need to reset dma_nr,
as we start filling a newly allocated array.

Link: https://lore.kernel.org/r/20190814075928.23766-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/nouveau/nouveau_dmem.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -682,6 +682,7 @@ nouveau_dmem_migrate_alloc_and_copy(stru
 	migrate->dma = kmalloc(sizeof(*migrate->dma) * npages, GFP_KERNEL);
 	if (!migrate->dma)
 		goto error;
+	migrate->dma_nr = 0;
 
 	/* Copy things over */
 	copy = drm->dmem->migrate.copy_func;