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If there's no USB handle, bail out from all functions immediately.

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git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1280 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
joerg_wunsch
2014-02-27 07:31:55 +00:00
parent d46b1ba752
commit d58a2d96f0
1 changed files with 15 additions and 0 deletions
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15
usb_libusb.c
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@@ -319,6 +319,9 @@ static void usbdev_close(union filedescriptor *fd)
{
usb_dev_handle *udev = (usb_dev_handle *)fd->usb.handle;
if (udev == NULL)
return -1;
(void)usb_release_interface(udev, usb_interface);
#if defined(__linux__)
@@ -342,6 +345,9 @@ static int usbdev_send(union filedescriptor *fd, unsigned char *bp, size_t mlen)
unsigned char * p = bp;
int tx_size;
if (udev == NULL)
return -1;
/*
* Split the frame into multiple packets. It's important to make
* sure we finish with a short packet, or else the device won't know
@@ -425,6 +431,9 @@ static int usbdev_recv(union filedescriptor *fd, unsigned char *buf, size_t nbyt
int i, amnt;
unsigned char * p = buf;
if (udev == NULL)
return -1;
for (i = 0; nbytes > 0;)
{
if (buflen <= bufptr)
@@ -478,6 +487,9 @@ static int usbdev_recv_frame(union filedescriptor *fd, unsigned char *buf, size_
int i;
unsigned char * p = buf;
if (udev == NULL)
return -1;
/* If there's an event EP, and it has data pending, return it first. */
if (fd->usb.eep != 0)
{
@@ -558,6 +570,9 @@ static int usbdev_drain(union filedescriptor *fd, int display)
usb_dev_handle *udev = (usb_dev_handle *)fd->usb.handle;
int rv;
if (udev == NULL)
return -1;
do {
if (fd->usb.use_interrupt_xfer)
rv = usb_interrupt_read(udev, fd->usb.rep, usbbuf, fd->usb.max_xfer, 100);