Commit 7be3e169 authored Feb 26, 2016 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman Mar 01, 2016

Drivers: hv: vmbus: don't loose HVMSG_TIMER_EXPIRED messages



We must handle HVMSG_TIMER_EXPIRED messages in the interrupt context
and we offload all the rest to vmbus_on_msg_dpc() tasklet. This functions
loops to see if there are new messages pending. In case we'll ever see
HVMSG_TIMER_EXPIRED message there we're going to lose it as we can't
handle it from there. Avoid looping in vmbus_on_msg_dpc(), we're OK
with handling one message per interrupt.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Radim <Kr.má&lt;rkrcmar@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent bec3c11b

drivers/hv/vmbus_drv.c

+33 −35

Original line number	Diff line number	Diff line
		@@ -740,10 +740,9 @@ static void vmbus_on_msg_dpc(unsigned long data)
		struct vmbus_channel_message_table_entry *entry;
		struct onmessage_work_context *ctx;

		while (1) {
		if (msg->header.message_type == HVMSG_NONE)
		/* no msg */
		break;
		return;

		hdr = (struct vmbus_channel_message_header *)msg->u.payload;

		@@ -756,7 +755,7 @@ static void vmbus_on_msg_dpc(unsigned long data)
		if (entry->handler_type == VMHT_BLOCKING) {
		ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
		if (ctx == NULL)
		continue;
		return;

		INIT_WORK(&ctx->work, vmbus_onmessage_work);
		memcpy(&ctx->msg, msg, sizeof(*msg));
		@@ -786,7 +785,6 @@ static void vmbus_on_msg_dpc(unsigned long data)
		wrmsrl(HV_X64_MSR_EOM, 0);
		}
		}
		}

		static void vmbus_isr(void)
		{