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HID: hyperv: make sure input buffer is big enough 

We need at least HID_MAX_BUFFER_SIZE (4096) bytes as input buffer. HID
core depends on this as it requires every input report to be at least as
big as advertised.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2013-12-19 12:32:24 +01:00 committed by Jiri Kosina
parent a4b1b5877b
commit 3ccfd0a8d7
1 changed files with 8 additions and 3 deletions
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11
drivers/hid/hid-hyperv.c
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@ -157,6 +157,7 @@ struct mousevsc_dev {
u32 report_desc_size;
struct hv_input_dev_info hid_dev_info;
struct hid_device *hid_device;
u8 input_buf[HID_MAX_BUFFER_SIZE];
};
@ -256,6 +257,7 @@ static void mousevsc_on_receive(struct hv_device *device,
struct synthhid_msg *hid_msg;
struct mousevsc_dev *input_dev = hv_get_drvdata(device);
struct synthhid_input_report *input_report;
size_t len;
pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
(packet->offset8 << 3));
@ -300,9 +302,12 @@ static void mousevsc_on_receive(struct hv_device *device,
(struct synthhid_input_report *)pipe_msg->data;
if (!input_dev->init_complete)
break;
hid_input_report(input_dev->hid_device,
HID_INPUT_REPORT, input_report->buffer,
input_report->header.size, 1);
len = min(input_report->header.size,
(u32)sizeof(input_dev->input_buf));
memcpy(input_dev->input_buf, input_report->buffer, len);
hid_input_report(input_dev->hid_device, HID_INPUT_REPORT,
input_dev->input_buf, len, 1);
break;
default:
pr_err("unsupported hid msg type - type %d len %d",