Drivers: hv: vmbus: avoid scheduling in interrupt context in vmbus_initiate_unload()

We have to call vmbus_initiate_unload() on crash to make kdump work but
the crash can also be happening in interrupt (e.g. Sysrq + c results in
such) where we can't schedule or the following will happen:

[  314.905786] bad: scheduling from the idle thread!

Just skipping the wait (and even adding some random wait here) won't help:
to make host-side magic working we're supposed to receive CHANNELMSG_UNLOAD
(and actually confirm the fact that we received it) but we can't use
interrupt-base path (vmbus_isr()-> vmbus_on_msg_dpc()). Implement a simple
busy wait ignoring all the other messages and use it if we're in an
interrupt context.

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>

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index af1d82e..d6c6114 100644 (file)
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -28,6 +28,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/completion.h>
+#include <linux/delay.h>
 #include <linux/hyperv.h>
 
 #include "hyperv_vmbus.h"
@@ -589,6 +590,40 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type)
        channel->target_vp = hv_context.vp_index[cur_cpu];
 }
 
+static void vmbus_wait_for_unload(void)
+{
+       int cpu = smp_processor_id();
+       void *page_addr = hv_context.synic_message_page[cpu];
+       struct hv_message *msg = (struct hv_message *)page_addr +
+                                 VMBUS_MESSAGE_SINT;
+       struct vmbus_channel_message_header *hdr;
+       bool unloaded = false;
+
+       while (1) {
+               if (msg->header.message_type == HVMSG_NONE) {
+                       mdelay(10);
+                       continue;
+               }
+
+               hdr = (struct vmbus_channel_message_header *)msg->u.payload;
+               if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE)
+                       unloaded = true;
+
+               msg->header.message_type = HVMSG_NONE;
+               /*
+                * header.message_type needs to be written before we do
+                * wrmsrl() below.
+                */
+               mb();
+
+               if (msg->header.message_flags.msg_pending)
+                       wrmsrl(HV_X64_MSR_EOM, 0);
+
+               if (unloaded)
+                       break;
+       }
+}
+
 /*
  * vmbus_unload_response - Handler for the unload response.
  */
@@ -614,7 +649,14 @@ void vmbus_initiate_unload(void)
        hdr.msgtype = CHANNELMSG_UNLOAD;
        vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header));
 
-       wait_for_completion(&vmbus_connection.unload_event);
+       /*
+        * vmbus_initiate_unload() is also called on crash and the crash can be
+        * happening in an interrupt context, where scheduling is impossible.
+        */
+       if (!in_interrupt())
+               wait_for_completion(&vmbus_connection.unload_event);
+       else
+               vmbus_wait_for_unload();
 }
 
 /*