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Diffstat (limited to 'drivers/hid/hid-core.c')
-rw-r--r--drivers/hid/hid-core.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 359616e3efbb..d2ecc9c45255 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1598,6 +1598,17 @@ static void hid_output_field(const struct hid_device *hid,
}
/*
+ * Compute the size of a report.
+ */
+static size_t hid_compute_report_size(struct hid_report *report)
+{
+ if (report->size)
+ return ((report->size - 1) >> 3) + 1;
+
+ return 0;
+}
+
+/*
* Create a report. 'data' has to be allocated using
* hid_alloc_report_buf() so that it has proper size.
*/
@@ -1609,7 +1620,7 @@ void hid_output_report(struct hid_report *report, __u8 *data)
if (report->id > 0)
*data++ = report->id;
- memset(data, 0, ((report->size - 1) >> 3) + 1);
+ memset(data, 0, hid_compute_report_size(report));
for (n = 0; n < report->maxfield; n++)
hid_output_field(report->device, report->field[n], data);
}
@@ -1739,7 +1750,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
csize--;
}
- rsize = ((report->size - 1) >> 3) + 1;
+ rsize = hid_compute_report_size(report);
if (report_enum->numbered && rsize >= HID_MAX_BUFFER_SIZE)
rsize = HID_MAX_BUFFER_SIZE - 1;