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vhost: fix get_user_pages_fast error handling 

get_user_pages_fast returns number of pages on success, negative value
on failure, but never 0. Fix vhost code to match this logic.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2010-02-23 11:25:23 +02:00
parent 73a99f0830
commit d6db3f5c11
1 changed files with 2 additions and 1 deletions
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3
drivers/vhost/vhost.c
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@ -646,8 +646,9 @@ static int set_bit_to_user(int nr, void __user *addr)
int bit = nr + (log % PAGE_SIZE) * 8; int bit = nr + (log % PAGE_SIZE) * 8;
int r; int r;
r = get_user_pages_fast(log, 1, 1, &page); r = get_user_pages_fast(log, 1, 1, &page);
if (r) if (r < 0)
return r; return r;
BUG_ON(r != 1);
base = kmap_atomic(page, KM_USER0); base = kmap_atomic(page, KM_USER0);
set_bit(bit, base); set_bit(bit, base);
kunmap_atomic(base, KM_USER0); kunmap_atomic(base, KM_USER0);