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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-12-15 06:02:01 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-15 06:27:30 +0300
commit940b68e2c3e4ebf032885203c3970e9649f814af (patch)
tree3f6da80644a206f45d67c2ef8bc892a5c5351d1f /drivers/hv/hyperv_vmbus.h
parent667d374064b0cc48b6122101b287908d1b392bdb (diff)
downloadlinux-940b68e2c3e4ebf032885203c3970e9649f814af.tar.xz
Drivers: hv: ring_buffer: eliminate hv_ringbuffer_peek()
Currently, there is only one user for hv_ringbuffer_read()/ hv_ringbuffer_peak() functions and the usage of these functions is: - insecure as we drop ring_lock between them, someone else (in theory only) can acquire it in between; - non-optimal as we do a number of things (acquire/release the above mentioned lock, calculate available space on the ring, ...) twice and this path is performance-critical. Remove hv_ringbuffer_peek() moving the logic from __vmbus_recvpacket() to hv_ringbuffer_read(). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
-rw-r--r--drivers/hv/hyperv_vmbus.h11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 4d67e984ac4f..0411b7bfb3c0 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -619,14 +619,9 @@ int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
struct kvec *kv_list,
u32 kv_count, bool *signal);
-int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
- u32 buflen);
-
-int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
- void *buffer,
- u32 buflen,
- u32 offset, bool *signal);
-
+int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info,
+ void *buffer, u32 buflen, u32 *buffer_actual_len,
+ u64 *requestid, bool *signal, bool raw);
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info);