USB: usbtmc: correct termination condition for reads.
Follow T&M convention of obeying EOM flag. Avoid exception cases where
instrument response size matches a buffer size.
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 91d3a94..6395f22 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -485,7 +485,8 @@
}
done += n_characters;
- if (n_characters < USBTMC_SIZE_IOBUFFER)
+ /* Terminate if end-of-message bit recieved from device */
+ if ((buffer[8] & 0x01) && (actual >= n_characters + 12))
remaining = 0;
else
remaining -= n_characters;