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| author | Jason Gunthorpe <jgg@mellanox.com> | 2018-06-29 19:31:50 +0200 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2018-06-30 21:58:09 +0200 |
| commit | bb94b55af3461e26b32f0e23d455abeae0cfca5d (patch) | |
| tree | 452551a00278b41d599598e1e80eed6b2e7c365b /drivers/thermal | |
| parent | sample/mdev/mbochs: add mbochs_kunmap_dmabuf (diff) | |
| download | linux-bb94b55af3461e26b32f0e23d455abeae0cfca5d.tar.xz linux-bb94b55af3461e26b32f0e23d455abeae0cfca5d.zip | |
vfio: Use get_user_pages_longterm correctly
The patch noted in the fixes below converted get_user_pages_fast() to
get_user_pages_longterm(), however the two calls differ in a few ways.
First _fast() is documented to not require the mmap_sem, while _longterm()
is documented to need it. Hold the mmap sem as required.
Second, _fast accepts an 'int write' while _longterm uses 'unsigned int
gup_flags', so the expression '!!(prot & IOMMU_WRITE)' is only working by
luck as FOLL_WRITE is currently == 0x1. Use the expected FOLL_WRITE
constant instead.
Fixes: 94db151dc892 ("vfio: disable filesystem-dax page pinning")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions