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authorAlexandre Peixoto Ferreira <alexandref75@gmail.com>2013-04-30 00:51:54 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-16 17:50:51 -0700
commit50c9ba311402f611b54b1da5c6d49873e907daee (patch)
treed38ecac99ffba4cc441df027ca898e52f81b9eee /drivers/usb/class
parentd2ddce37a7f5992e256ba0d893f3ad5e2af96b21 (diff)
downloadlinux-rt-50c9ba311402f611b54b1da5c6d49873e907daee.tar.gz
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')
-rw-r--r--drivers/usb/class/usbtmc.c10
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,