diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hyperv.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 09f25ade88b0..216c0b9e9be5 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -250,6 +250,8 @@ static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi) read_loc = READ_ONCE(rbi->ring_buffer->read_index); write_loc = READ_ONCE(rbi->ring_buffer->write_index); + if (unlikely(hv_ringbuffer_indices_invalid(rbi, read_loc, write_loc))) + return 0; return hv_ringbuffer_avail_read(rbi, read_loc, write_loc); } @@ -260,6 +262,8 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi) read_loc = READ_ONCE(rbi->ring_buffer->read_index); write_loc = READ_ONCE(rbi->ring_buffer->write_index); + if (unlikely(hv_ringbuffer_indices_invalid(rbi, read_loc, write_loc))) + return 0; return hv_ringbuffer_avail_write(rbi, read_loc, write_loc); } |