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Staging: hv: mousevsc: Cleanup mousevsc_on_channel_callback() 

Cleanup mousevsc_on_channel_callback(). This is based on the code provided
by Joe Perches <joe@perches.com>.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-10-25 17:19:50 -07:00 committed by Greg Kroah-Hartman
parent 32325302aa
commit 3b5632efd9
1 changed files with 34 additions and 45 deletions
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79
drivers/staging/hv/hv_mouse.c
View File

@ -313,73 +313,62 @@ static void mousevsc_on_receive(struct hv_device *device,
static void mousevsc_on_channel_callback(void *context)
{
const int packetSize = 0x100;
int ret = 0;
struct hv_device *device = (struct hv_device *)context;
const int packet_size = 0x100;
int ret;
struct hv_device *device = context;
u32 bytes_recvd;
u64 req_id;
unsigned char packet[0x100];
struct vmpacket_descriptor *desc;
unsigned char *buffer = packet;
int bufferlen = packetSize;
unsigned char *buffer;
int bufferlen = packet_size;
buffer = kmalloc(bufferlen, GFP_ATOMIC);
if (!buffer)
return;
do {
ret = vmbus_recvpacket_raw(device->channel, buffer,
bufferlen, &bytes_recvd, &req_id);
if (ret == 0) {
if (bytes_recvd > 0) {
desc = (struct vmpacket_descriptor *)buffer;
switch (ret) {
case 0:
if (bytes_recvd <= 0) {
kfree(buffer);
return;
}
desc = (struct vmpacket_descriptor *)buffer;
switch (desc->type) {
case VM_PKT_COMP:
break;
switch (desc->type) {
case VM_PKT_COMP:
break;
case VM_PKT_DATA_INBAND:
mousevsc_on_receive(
device, desc);
break;
case VM_PKT_DATA_INBAND:
mousevsc_on_receive(device, desc);
break;
default:
pr_err("unhandled packet type %d, tid %llx len %d\n",
desc->type,
req_id,
bytes_recvd);
break;
}
/* reset */
if (bufferlen > packetSize) {
kfree(buffer);
buffer = packet;
bufferlen = packetSize;
}
} else {
if (bufferlen > packetSize) {
kfree(buffer);
buffer = packet;
bufferlen = packetSize;
}
default:
pr_err("unhandled packet type %d, tid %llx len %d\n",
desc->type,
req_id,
bytes_recvd);
break;
}
} else if (ret == -ENOBUFS) {
break;
case -ENOBUFS:
kfree(buffer);
/* Handle large packet */
bufferlen = bytes_recvd;
buffer = kzalloc(bytes_recvd, GFP_ATOMIC);
buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
if (buffer == NULL) {
buffer = packet;
bufferlen = packetSize;
break;
return;
}
break;
}
} while (1);
return;
}
static int mousevsc_connect_to_vsp(struct hv_device *device)