monitor_pages was a void pointer, containing an unknown number of arrays that
we just "knew" were a child and parent array of a specific size. Instead of
that implicit knowledge, let's make them a real pointer, allowing us to have
type safety, and a semblance of sane addressing schemes.
Cc: "K. Y. Srinivasan" <k...@microsoft.com>
Cc: Haiyang Zhang <haiya...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/hv/channel.c | 10 ++++------
drivers/hv/connection.c | 21 ++++++++++-----------
drivers/hv/hyperv_vmbus.h | 2 +-
3 files changed, 15 insertions(+), 18 deletions(-)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index dde30b48..04bf0656 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -47,8 +47,8 @@ static void vmbus_setevent(struct vmbus_channel *channel)
(unsigned long *) vmbus_connection.send_int_page +
(channel->offermsg.child_relid >> 5));
- monitorpage = vmbus_connection.monitor_pages;
- monitorpage++; /* Get the child to parent monitor page */
+ /* Get the child to parent monitor page */
+ monitorpage = vmbus_connection.monitor_pages[1];
sync_set_bit(channel->monitor_bit,
(unsigned long *)&monitorpage->trigger_group
@@ -69,8 +69,7 @@ void vmbus_get_debug_info(struct vmbus_channel *channel,
u8 monitor_group = (u8)channel->offermsg.monitorid / 32;
u8 monitor_offset = (u8)channel->offermsg.monitorid % 32;
- monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages;
-
+ monitorpage = vmbus_connection.monitor_pages[0];
debuginfo->servermonitor_pending =
monitorpage->trigger_group[monitor_group].pending;
debuginfo->servermonitor_latency =
@@ -79,8 +78,7 @@ void vmbus_get_debug_info(struct vmbus_channel *channel,
monitorpage->parameter[monitor_group]
[monitor_offset].connectionid.u.id;
- monitorpage++;
-
+ monitorpage = vmbus_connection.monitor_pages[1];
debuginfo->clientmonitor_pending =
monitorpage->trigger_group[monitor_group].pending;
debuginfo->clientmonitor_latency =
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 8f4743ab..4faea979 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -76,10 +76,8 @@ static int vmbus_negotiate_version(struct
vmbus_channel_msginfo *msginfo,
msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
msg->vmbus_version_requested = version;
msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
- msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages);
- msg->monitor_page2 = virt_to_phys(
- (void *)((unsigned long)vmbus_connection.monitor_pages +
- PAGE_SIZE));
+ msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
+ msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
/*
* Add to list before we send the request since we may
@@ -169,9 +167,10 @@ int vmbus_connect(void)
* Setup the monitor notification facility. The 1st page for
* parent->child and the 2nd page for child->parent
*/
- vmbus_connection.monitor_pages =
- (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1);
- if (vmbus_connection.monitor_pages == NULL) {
+ vmbus_connection.monitor_pages[0] = (void
*)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
+ vmbus_connection.monitor_pages[1] = (void
*)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
+ if ((vmbus_connection.monitor_pages[0] == NULL) ||
+ (vmbus_connection.monitor_pages[1] == NULL)) {
ret = -ENOMEM;
goto cleanup;
}
@@ -229,10 +228,10 @@ cleanup:
vmbus_connection.int_page = NULL;
}
- if (vmbus_connection.monitor_pages) {
- free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
- vmbus_connection.monitor_pages = NULL;
- }
+ free_pages((unsigned long)vmbus_connection.monitor_pages[0], 1);
+ free_pages((unsigned long)vmbus_connection.monitor_pages[1], 1);
+ vmbus_connection.monitor_pages[0] = NULL;
+ vmbus_connection.monitor_pages[1] = NULL;
kfree(msginfo);
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index d84918fe..d58c22ff 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -612,7 +612,7 @@ struct vmbus_connection {
* 2 pages - 1st page for parent->child notification and 2nd
* is child->parent notification
*/
- void *monitor_pages;
+ struct hv_monitor_page *monitor_pages[2];
struct list_head chn_msg_list;
spinlock_t channelmsg_lock;
--
1.8.4.3.gca3854a
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