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Drivers: hv: fcopy: process deferred messages when we complete the transaction

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In theory, the host is not supposed to issue any requests before be reply to
the previous one. In KVP we, however, support the following scenarios:
1) A message was received before userspace daemon registered;
2) A message was received while the previous one is still being processed.
In FCOPY we support only the former. Add support for the later, use
hv_poll_channel() to do the job.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.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 2015-04-11 18:07:42 -07:00 committed by Greg Kroah-Hartman
parent 8efe78fdb1
commit 242f31221d
1 changed files with 9 additions and 3 deletions
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12
drivers/hv/hv_fcopy.c
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@ -98,6 +98,8 @@ static void fcopy_work_func(struct work_struct *dummy)
if (down_trylock(&fcopy_transaction.read_sema)) if (down_trylock(&fcopy_transaction.read_sema))
; ;
hv_poll_channel(fcopy_transaction.fcopy_context,
hv_fcopy_onchannelcallback);
} }
static int fcopy_handle_handshake(u32 version) static int fcopy_handle_handshake(u32 version)
@ -117,8 +119,8 @@ static int fcopy_handle_handshake(u32 version)
pr_info("FCP: user-mode registering done. Daemon version: %d\n", pr_info("FCP: user-mode registering done. Daemon version: %d\n",
version); version);
fcopy_transaction.active = false; fcopy_transaction.active = false;
if (fcopy_transaction.fcopy_context) hv_poll_channel(fcopy_transaction.fcopy_context,
hv_fcopy_onchannelcallback(fcopy_transaction.fcopy_context); hv_fcopy_onchannelcallback);
in_hand_shake = false; in_hand_shake = false;
return 0; return 0;
} }
@ -226,6 +228,7 @@ void hv_fcopy_onchannelcallback(void *context)
fcopy_transaction.fcopy_context = context; fcopy_transaction.fcopy_context = context;
return; return;
} }
fcopy_transaction.fcopy_context = NULL;
vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen, vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen,
&requestid); &requestid);
@ -333,8 +336,11 @@ static ssize_t fcopy_write(struct file *file, const char __user *buf,
* Complete the transaction by forwarding the result * Complete the transaction by forwarding the result
* to the host. But first, cancel the timeout. * to the host. But first, cancel the timeout.
*/ */
if (cancel_delayed_work_sync(&fcopy_work)) if (cancel_delayed_work_sync(&fcopy_work)) {
fcopy_respond_to_host(response); fcopy_respond_to_host(response);
hv_poll_channel(fcopy_transaction.fcopy_context,
hv_fcopy_onchannelcallback);
}
return sizeof(int); return sizeof(int);
} }