Input: HID - handle multi-transascion reports

Fixes handling of multi-transaction reports for HID devices. New
function hid_size_buffers() that calculates the longest report
for each endpoint and stores the result in the hid_device object.
These lengths are used to allocate buffers that are large enough
to store any report on the endpoint. For compatibility, the minimum
size for an endpoint buffer set to HID_BUFFER_SIZE rather than the
known optimal case (the longest report length).

It fixes bug #3063 in bugzilla.

Signed-off-by: Michael Haboustak <mike-@cinci.rr.com>

I simplified the patch a bit to use just a single buffer size.

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/input/hid.h b/drivers/usb/input/hid.h
index ca3e170ce0b3..d76bbc81f6a8 100644
--- a/drivers/usb/input/hid.h
+++ b/drivers/usb/input/hid.h
@@ -351,7 +351,8 @@ struct hid_report_enum {
 
 #define HID_REPORT_TYPES 3
 
-#define HID_BUFFER_SIZE         64              /* use 64 for compatibility with all possible packetlen */
+#define HID_MIN_BUFFER_SIZE     64              /* make sure there is at least a packet size of space */
+#define HID_MAX_BUFFER_SIZE     4096            /* 4kb */
 #define HID_CONTROL_FIFO_SIZE   256             /* to init devices with >100 reports */
 #define HID_OUTPUT_FIFO_SIZE    64
 
@@ -389,6 +390,8 @@ struct hid_device {							/* device report descriptor */
 
         unsigned long iofl;                                             /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
 
+        unsigned int bufsize;                                           /* URB buffer size */
+
         struct urb *urbin;                                              /* Input URB */
         char *inbuf;                                                    /* Input buffer */
         dma_addr_t inbuf_dma;                                           /* Input buffer dma */