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USB: usbtmc: correct termination condition for reads.

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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>
This commit is contained in:
Steve Holland 2009-06-18 17:37:49 -05:00 committed by Greg Kroah-Hartman
parent 92d07e422d
commit 4143d178e7
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/class/usbtmc.c
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@ -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;