diff options
| author | Steve Holland <sdh4@iastate.edu> | 2009-06-18 17:37:49 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:35 -0700 |
| commit | 4143d178e7b39c00d5277040c69a1522c4d98871 (patch) | |
| tree | 38f372250370761786701b5c93fa8a41699a43c1 | |
| parent | 92d07e422df3cc5370d0d9b95a671abb69d50ef1 (diff) | |
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>
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 91d3a94eeaa..6395f22a58e 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -485,7 +485,8 @@ static ssize_t usbtmc_read(struct file *filp, char __user *buf, } 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; |