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xsk: share the mmap_sem for page pinning

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Holding mmap_sem exclusively for a gup() is an overkill. Lets
share the lock and replace the gup call for gup_longterm(), as
it is better suited for the lifetime of the pinning.

Fixes: c0c77d8fb7 ("xsk: add user memory registration support sockopt")
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Bjorn Topel <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
CC: netdev@vger.kernel.org
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Davidlohr Bueso 2019-02-11 08:15:29 -08:00 committed by Daniel Borkmann
parent 3defaf2f15
commit e451eb5106
1 changed files with 4 additions and 4 deletions
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8
net/xdp/xdp_umem.c
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@ -259,10 +259,10 @@ static int xdp_umem_pin_pages(struct xdp_umem *umem)
if (!umem->pgs)
return -ENOMEM;
down_write(&current->mm->mmap_sem);
npgs = get_user_pages(umem->address, umem->npgs,
gup_flags, &umem->pgs[0], NULL);
up_write(&current->mm->mmap_sem);
down_read(&current->mm->mmap_sem);
npgs = get_user_pages_longterm(umem->address, umem->npgs,
gup_flags, &umem->pgs[0], NULL);
up_read(&current->mm->mmap_sem);
if (npgs != umem->npgs) {
if (npgs >= 0) {