linux-kernel - [PATCH 5.0 24/89] RDMA/mlx5: Use rdma_user_map

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Date:   Tue, 30 Apr 2019 13:38:15 +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, Jason Gunthorpe <jgg@...lanox.com>,
        Haggai Eran <haggaie@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>
Subject: [PATCH 5.0 24/89] RDMA/mlx5: Use rdma_user_map_io for mapping BAR pages

From: Jason Gunthorpe <jgg@...lanox.com>

commit d5e560d3f72382ac4e3bfe4e0f0420e6a220b039 upstream.

Since mlx5 supports device disassociate it must use this API for all
BAR page mmaps, otherwise the pages can remain mapped after the device
is unplugged causing a system crash.

Cc: stable@...r.kernel.org
Fixes: 5f9794dc94f5 ("RDMA/ucontext: Add a core API for mmaping driver IO memory")
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Reviewed-by: Haggai Eran <haggaie@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/hw/mlx5/main.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2154,14 +2154,12 @@ static int mlx5_ib_mmap(struct ib_uconte
 		if (PAGE_SIZE > 4096)
 			return -EOPNOTSUPP;
 
-		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 		pfn = (dev->mdev->iseg_base +
 		       offsetof(struct mlx5_init_seg, internal_timer_h)) >>
 			PAGE_SHIFT;
-		if (io_remap_pfn_range(vma, vma->vm_start, pfn,
-				       PAGE_SIZE, vma->vm_page_prot))
-			return -EAGAIN;
-		break;
+		return rdma_user_mmap_io(&context->ibucontext, vma, pfn,
+					 PAGE_SIZE,
+					 pgprot_noncached(vma->vm_page_prot));
 	case MLX5_IB_MMAP_CLOCK_INFO:
 		return mlx5_ib_mmap_clock_info_page(dev, vma, context);