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Drivers: hv: allocate the exact needed memory for messages

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When we need to pass a buffer with Hyper-V message we don't need to always
allocate 256 bytes for the message: the real message length is known from
the header. Change 'struct onmessage_work_context' to make it possible to
not over-allocate.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200406104154.45010-3-vkuznets@redhat.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Vitaly Kuznetsov 2020-04-06 12:41:51 +02:00 committed by Wei Liu
parent ac0f7d4258
commit a276463b7a
1 changed files with 10 additions and 5 deletions
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15
drivers/hv/vmbus_drv.c
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@ -1019,7 +1019,10 @@ static struct bus_type hv_bus = {
struct onmessage_work_context {
struct work_struct work;
struct hv_message msg;
struct {
struct hv_message_header header;
u8 payload[];
} msg;
};
static void vmbus_onmessage_work(struct work_struct *work)
@ -1072,7 +1075,8 @@ void vmbus_on_msg_dpc(unsigned long data)
goto msg_handled;
if (entry->handler_type == VMHT_BLOCKING) {
ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
ctx = kmalloc(sizeof(*ctx) + msg->header.payload_size,
GFP_ATOMIC);
if (ctx == NULL)
return;
@ -1126,10 +1130,11 @@ static void vmbus_force_channel_rescinded(struct vmbus_channel *channel)
WARN_ON(!is_hvsock_channel(channel));
/*
* sizeof(*ctx) is small and the allocation should really not fail,
* Allocation size is small and the allocation should really not fail,
* otherwise the state of the hv_sock connections ends up in limbo.
*/
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL | __GFP_NOFAIL);
ctx = kzalloc(sizeof(*ctx) + sizeof(*rescind),
GFP_KERNEL | __GFP_NOFAIL);
/*
* So far, these are not really used by Linux. Just set them to the
@ -1139,7 +1144,7 @@ static void vmbus_force_channel_rescinded(struct vmbus_channel *channel)
ctx->msg.header.payload_size = sizeof(*rescind);
/* These values are actually used by Linux. */
rescind = (struct vmbus_channel_rescind_offer *)ctx->msg.u.payload;
rescind = (struct vmbus_channel_rescind_offer *)ctx->msg.payload;
rescind->header.msgtype = CHANNELMSG_RESCIND_CHANNELOFFER;
rescind->child_relid = channel->offermsg.child_relid;