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VFIO fixes for v4.18 

- Fix deadlock in mbochs sample driver (Alexey Khoroshilov)
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Merge tag 'vfio-v4.18-rc5' of git://github.com/awilliam/linux-vfio

Pull VFIO fix from Alex Williamson:
 "Fix deadlock in mbochs sample driver (Alexey Khoroshilov)"

* tag 'vfio-v4.18-rc5' of git://github.com/awilliam/linux-vfio:
  sample: vfio-mdev: avoid deadlock in mdev_access()
This commit is contained in:
Linus Torvalds 2018-07-13 12:37:45 -07:00
parent 79facf308f 498e8bf51c
commit 2a7e1211e1
1 changed files with 3 additions and 1 deletions
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4
samples/vfio-mdev/mbochs.c
View File

@ -178,6 +178,8 @@ static const char *vbe_name(u32 index)
return "(invalid)";
}
static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
pgoff_t pgoff);
static struct page *mbochs_get_page(struct mdev_state *mdev_state,
pgoff_t pgoff);
@ -394,7 +396,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
pos -= MBOCHS_MMIO_BAR_OFFSET;
poff = pos & ~PAGE_MASK;
pg = mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
map = kmap(pg);
if (is_write)
memcpy(map + poff, buf, count);