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path: root/drivers/hv/vmbus_drv.c
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Diffstat (limited to 'drivers/hv/vmbus_drv.c')
-rw-r--r--drivers/hv/vmbus_drv.c80
1 files changed, 38 insertions, 42 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 0087b49095eb..ed84e96715a0 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -608,40 +608,6 @@ static void vmbus_free_dynids(struct hv_driver *drv)
spin_unlock(&drv->dynids.lock);
}
-/* Parse string of form: 1b4e28ba-2fa1-11d2-883f-b9a761bde3f */
-static int get_uuid_le(const char *str, uuid_le *uu)
-{
- unsigned int b[16];
- int i;
-
- if (strlen(str) < 37)
- return -1;
-
- for (i = 0; i < 36; i++) {
- switch (i) {
- case 8: case 13: case 18: case 23:
- if (str[i] != '-')
- return -1;
- break;
- default:
- if (!isxdigit(str[i]))
- return -1;
- }
- }
-
- /* unparse little endian output byte order */
- if (sscanf(str,
- "%2x%2x%2x%2x-%2x%2x-%2x%2x-%2x%2x-%2x%2x%2x%2x%2x%2x",
- &b[3], &b[2], &b[1], &b[0],
- &b[5], &b[4], &b[7], &b[6], &b[8], &b[9],
- &b[10], &b[11], &b[12], &b[13], &b[14], &b[15]) != 16)
- return -1;
-
- for (i = 0; i < 16; i++)
- uu->b[i] = b[i];
- return 0;
-}
-
/*
* store_new_id - sysfs frontend to vmbus_add_dynid()
*
@@ -651,11 +617,12 @@ static ssize_t new_id_store(struct device_driver *driver, const char *buf,
size_t count)
{
struct hv_driver *drv = drv_to_hv_drv(driver);
- uuid_le guid = NULL_UUID_LE;
+ uuid_le guid;
ssize_t retval;
- if (get_uuid_le(buf, &guid) != 0)
- return -EINVAL;
+ retval = uuid_le_to_bin(buf, &guid);
+ if (retval)
+ return retval;
if (hv_vmbus_get_id(drv, &guid))
return -EEXIST;
@@ -677,12 +644,14 @@ static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
{
struct hv_driver *drv = drv_to_hv_drv(driver);
struct vmbus_dynid *dynid, *n;
- uuid_le guid = NULL_UUID_LE;
- size_t retval = -ENODEV;
+ uuid_le guid;
+ ssize_t retval;
- if (get_uuid_le(buf, &guid))
- return -EINVAL;
+ retval = uuid_le_to_bin(buf, &guid);
+ if (retval)
+ return retval;
+ retval = -ENODEV;
spin_lock(&drv->dynids.lock);
list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
struct hv_vmbus_device_id *id = &dynid->id;
@@ -798,8 +767,10 @@ static void vmbus_device_release(struct device *device)
struct hv_device *hv_dev = device_to_hv_device(device);
struct vmbus_channel *channel = hv_dev->channel;
+ mutex_lock(&vmbus_connection.channel_mutex);
hv_process_channel_removal(channel,
channel->offermsg.child_relid);
+ mutex_unlock(&vmbus_connection.channel_mutex);
kfree(hv_dev);
}
@@ -877,7 +848,32 @@ void vmbus_on_msg_dpc(unsigned long data)
INIT_WORK(&ctx->work, vmbus_onmessage_work);
memcpy(&ctx->msg, msg, sizeof(*msg));
- queue_work(vmbus_connection.work_queue, &ctx->work);
+ /*
+ * The host can generate a rescind message while we
+ * may still be handling the original offer. We deal with
+ * this condition by ensuring the processing is done on the
+ * same CPU.
+ */
+ switch (hdr->msgtype) {
+ case CHANNELMSG_RESCIND_CHANNELOFFER:
+ /*
+ * If we are handling the rescind message;
+ * schedule the work on the global work queue.
+ */
+ schedule_work_on(vmbus_connection.connect_cpu,
+ &ctx->work);
+ break;
+
+ case CHANNELMSG_OFFERCHANNEL:
+ atomic_inc(&vmbus_connection.offer_in_progress);
+ queue_work_on(vmbus_connection.connect_cpu,
+ vmbus_connection.work_queue,
+ &ctx->work);
+ break;
+
+ default:
+ queue_work(vmbus_connection.work_queue, &ctx->work);
+ }
} else
entry->message_handler(hdr);