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Drivers: hv: remove code duplication between vmbus_recvpacket()/vmbus_recvpacket_raw() 

vmbus_recvpacket() and vmbus_recvpacket_raw() are almost identical but
there are two discrepancies:
1) vmbus_recvpacket() doesn't propagate errors from hv_ringbuffer_read()
   which looks like it is not desired.
2) There is an error message printed in packetlen > bufferlen case in
   vmbus_recvpacket(). I'm removing it as it is usless for users to see
   such messages and /vmbus_recvpacket_raw() doesn't have it.

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>
This commit is contained in:
Vitaly Kuznetsov 2015-12-14 19:02:00 -08:00 committed by Greg Kroah-Hartman
parent b5f53dde8d
commit 667d374064
1 changed files with 22 additions and 43 deletions
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65
drivers/hv/channel.c
View File

@ -922,8 +922,10 @@ EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
*
* Mainly used by Hyper-V drivers.
*/
int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len, u64 *requestid)
static inline int
__vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len, u64 *requestid,
bool raw)
{
struct vmpacket_descriptor desc;
u32 packetlen;
@ -941,27 +943,34 @@ int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
return 0;
packetlen = desc.len8 << 3;
userlen = packetlen - (desc.offset8 << 3);
if (!raw)
userlen = packetlen - (desc.offset8 << 3);
else
userlen = packetlen;
*buffer_actual_len = userlen;
if (userlen > bufferlen) {
pr_err("Buffer too small - got %d needs %d\n",
bufferlen, userlen);
return -ETOOSMALL;
}
if (userlen > bufferlen)
return -ENOBUFS;
*requestid = desc.trans_id;
/* Copy over the packet to the user buffer */
ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen,
(desc.offset8 << 3), &signal);
raw ? 0 : desc.offset8 << 3, &signal);
if (signal)
vmbus_setevent(channel);
return 0;
return ret;
}
int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len,
u64 *requestid)
{
return __vmbus_recvpacket(channel, buffer, bufferlen,
buffer_actual_len, requestid, false);
}
EXPORT_SYMBOL(vmbus_recvpacket);
@ -972,37 +981,7 @@ int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len,
u64 *requestid)
{
struct vmpacket_descriptor desc;
u32 packetlen;
int ret;
bool signal = false;
*buffer_actual_len = 0;
*requestid = 0;
ret = hv_ringbuffer_peek(&channel->inbound, &desc,
sizeof(struct vmpacket_descriptor));
if (ret != 0)
return 0;
packetlen = desc.len8 << 3;
*buffer_actual_len = packetlen;
if (packetlen > bufferlen)
return -ENOBUFS;
*requestid = desc.trans_id;
/* Copy over the entire packet to the user buffer */
ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0,
&signal);
if (signal)
vmbus_setevent(channel);
return ret;
return __vmbus_recvpacket(channel, buffer, bufferlen,
buffer_actual_len, requestid, true);
}
EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);