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authorAndrea Parri (Microsoft) <parri.andrea@gmail.com>2020-12-09 08:08:23 +0100
committerWei Liu <wei.liu@kernel.org>2021-02-05 09:55:42 +0000
commit9c400d3548c39378327268fb18112b229f91b220 (patch)
tree6b804c66b242aea0832caefb41e963518f1b9001 /drivers/hv
parente99c4afbee07e9323e9191a20b24d74dbf815bdf (diff)
Drivers: hv: vmbus: Reduce number of references to message in vmbus_on_msg_dpc()
Simplify the function by removing various references to the hv_message 'msg', introduce local variables 'msgtype' and 'payload_size'. Suggested-by: Juan Vazquez <juvazq@microsoft.com> Suggested-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20201209070827.29335-3-parri.andrea@gmail.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index d491fdcee61f..9749cbce33d4 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1057,9 +1057,11 @@ void vmbus_on_msg_dpc(unsigned long data)
struct hv_message *msg = (struct hv_message *)page_addr +
VMBUS_MESSAGE_SINT;
struct vmbus_channel_message_header *hdr;
+ enum vmbus_channel_message_type msgtype;
const struct vmbus_channel_message_table_entry *entry;
struct onmessage_work_context *ctx;
u32 message_type = msg->header.message_type;
+ __u8 payload_size;
/*
* 'enum vmbus_channel_message_type' is supposed to always be 'u32' as
@@ -1073,40 +1075,38 @@ void vmbus_on_msg_dpc(unsigned long data)
return;
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
+ msgtype = hdr->msgtype;
trace_vmbus_on_msg_dpc(hdr);
- if (hdr->msgtype >= CHANNELMSG_COUNT) {
- WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
+ if (msgtype >= CHANNELMSG_COUNT) {
+ WARN_ONCE(1, "unknown msgtype=%d\n", msgtype);
goto msg_handled;
}
- if (msg->header.payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) {
- WARN_ONCE(1, "payload size is too large (%d)\n",
- msg->header.payload_size);
+ payload_size = msg->header.payload_size;
+ if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) {
+ WARN_ONCE(1, "payload size is too large (%d)\n", payload_size);
goto msg_handled;
}
- entry = &channel_message_table[hdr->msgtype];
+ entry = &channel_message_table[msgtype];
if (!entry->message_handler)
goto msg_handled;
- if (msg->header.payload_size < entry->min_payload_len) {
- WARN_ONCE(1, "message too short: msgtype=%d len=%d\n",
- hdr->msgtype, msg->header.payload_size);
+ if (payload_size < entry->min_payload_len) {
+ WARN_ONCE(1, "message too short: msgtype=%d len=%d\n", msgtype, payload_size);
goto msg_handled;
}
if (entry->handler_type == VMHT_BLOCKING) {
- ctx = kmalloc(sizeof(*ctx) + msg->header.payload_size,
- GFP_ATOMIC);
+ ctx = kmalloc(sizeof(*ctx) + payload_size, GFP_ATOMIC);
if (ctx == NULL)
return;
INIT_WORK(&ctx->work, vmbus_onmessage_work);
- memcpy(&ctx->msg, msg, sizeof(msg->header) +
- msg->header.payload_size);
+ memcpy(&ctx->msg, msg, sizeof(msg->header) + payload_size);
/*
* The host can generate a rescind message while we
@@ -1115,7 +1115,7 @@ void vmbus_on_msg_dpc(unsigned long data)
* by offer_in_progress and by channel_mutex. See also the
* inline comments in vmbus_onoffer_rescind().
*/
- switch (hdr->msgtype) {
+ switch (msgtype) {
case CHANNELMSG_RESCIND_CHANNELOFFER:
/*
* If we are handling the rescind message;