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Staging: hv: vmbus: Introduce read dependency in hv_get_ringbuffer_availbytes()

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Introduce read dependency in hv_get_ringbuffer_availbytes().

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-06-06 15:49:52 -07:00 committed by Greg Kroah-Hartman
parent ef0d5b2302
commit df2a4a7114
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/hv/ring_buffer.c
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@ -50,6 +50,8 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
{
u32 read_loc, write_loc;
smp_read_barrier_depends();
/* Capture the read/write indices before they changed */
read_loc = rbi->ring_buffer->read_index;
write_loc = rbi->ring_buffer->write_index;