linux-kernel - [PATCH] virtio-fs: fix multiple tag support

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Message-Id: <20190317003521.69366-1-bo.liu@linux.alibaba.com>
Date:   Sun, 17 Mar 2019 08:35:21 +0800
From:   Liu Bo <bo.liu@...ux.alibaba.com>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH] virtio-fs: fix multiple tag support

While doing memremap from pci_dev's system bus address to kernel virtual
address, we assign a wrong value to the %end of pgmap.res, which ends up
with a wrong resource size in the process of memremap, and that further
prevent the second virtiofs pci device from being probed successfully.

Signed-off-by: Liu Bo <bo.liu@...ux.alibaba.com>
---
 fs/fuse/virtio_fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 88b00055589b..7abf2187d85f 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -713,7 +713,7 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
 	pgmap->res = (struct resource){
 		.name = "virtio-fs dax window",
 		.start = phys_addr,
-		.end = phys_addr + cache_len,
+		.end = phys_addr + cache_len - 1,
 	};
 
 	fs->window_kaddr = devm_memremap_pages(&pci_dev->dev, pgmap);
-- 
2.20.1.2.gb21ebb6