diff options
| author | Alexandre Peixoto Ferreira <alexandref75@gmail.com> | 2013-04-30 00:51:54 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-16 17:50:51 -0700 |
| commit | 50c9ba311402f611b54b1da5c6d49873e907daee (patch) | |
| tree | d38ecac99ffba4cc441df027ca898e52f81b9eee /drivers/usb/class/usbtmc.c | |
| parent | d2ddce37a7f5992e256ba0d893f3ad5e2af96b21 (diff) | |
USB: usbtmc: Change magic number to constant
These patches implement a modification of the USBTMC
protocol to allow operation with Rigol equipment. Cosmetic change to show
that 12 is the USBTMC header size.
Signed-off-by: Alexandre Peixoto Ferreira <alexandref75@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/usbtmc.c')
| -rw-r--r-- | drivers/usb/class/usbtmc.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c index 8ebd06bf4865..609dbc2f7151 100644 --- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -640,8 +640,8 @@ static ssize_t usbtmc_write(struct file *filp, const char __user *buf, done = 0; while (remaining > 0) { - if (remaining > USBTMC_SIZE_IOBUFFER - 12) { - this_part = USBTMC_SIZE_IOBUFFER - 12; + if (remaining > USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE) { + this_part = USBTMC_SIZE_IOBUFFER - USBTMC_HEADER_SIZE; buffer[8] = 0; } else { this_part = remaining; @@ -662,13 +662,13 @@ static ssize_t usbtmc_write(struct file *filp, const char __user *buf, buffer[10] = 0; /* Reserved */ buffer[11] = 0; /* Reserved */ - if (copy_from_user(&buffer[12], buf + done, this_part)) { + if (copy_from_user(&buffer[USBTMC_HEADER_SIZE], buf + done, this_part)) { retval = -EFAULT; goto exit; } - n_bytes = roundup(12 + this_part, 4); - memset(buffer + 12 + this_part, 0, n_bytes - (12 + this_part)); + n_bytes = roundup(USBTMC_HEADER_SIZE + this_part, 4); + memset(buffer + USBTMC_HEADER_SIZE + this_part, 0, n_bytes - (USBTMC_HEADER_SIZE + this_part)); do { retval = usb_bulk_msg(data->usb_dev, |