USB: usbtmc: Fix short reads in usbtmc_read()

The header size should not be included in the number of bytes requested of the
instrument

Signed-off-by: Steve Holland <sdh4@iastate.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 40ef4da..f2fde7c 100644 (file)
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -407,10 +407,10 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf,
                buffer[1] = data->bTag;
                buffer[2] = ~(data->bTag);
                buffer[3] = 0; /* Reserved */
-               buffer[4] = (this_part - 12 - 3) & 255;
-               buffer[5] = ((this_part - 12 - 3) >> 8) & 255;
-               buffer[6] = ((this_part - 12 - 3) >> 16) & 255;
-               buffer[7] = ((this_part - 12 - 3) >> 24) & 255;
+               buffer[4] = (this_part) & 255;
+               buffer[5] = ((this_part) >> 8) & 255;
+               buffer[6] = ((this_part) >> 16) & 255;
+               buffer[7] = ((this_part) >> 24) & 255;
                buffer[8] = data->TermCharEnabled * 2;
                /* Use term character? */
                buffer[9] = data->TermChar;