问rtl-sdr在运行rtl_tcp或rtl_test时出现“总线错误”崩溃。

EN

diff --git a/src/librtlsdr.c b/src/librtlsdr.c
index 89ec903..61bcebc 100644
--- a/src/librtlsdr.c
+++ b/src/librtlsdr.c
@@ -1748,50 +1748,6 @@ static int _rtlsdr_alloc_async_buffers(rtlsdr_dev_t *dev)
        dev->xfer_buf = malloc(dev->xfer_buf_num * sizeof(unsigned char *));
        memset(dev->xfer_buf, 0, dev->xfer_buf_num * sizeof(unsigned char *));

-#if defined (__linux__) && LIBUSB_API_VERSION >= 0x01000105
-       fprintf(stderr, "Allocating %d zero-copy buffers\n", dev->xfer_buf_num);
-
-       dev->use_zerocopy = 1;
-       for (i = 0; i < dev->xfer_buf_num; ++i) {
-               dev->xfer_buf[i] = libusb_dev_mem_alloc(dev->devh, dev->xfer_buf_len);
-
-               if (dev->xfer_buf[i]) {
-                       /* Check if Kernel usbfs mmap() bug is present: if the
-                        * mapping is correct, the buffers point to memory that
-                        * was memset to 0 by the Kernel, otherwise, they point
-                        * to random memory. We check if the buffers are zeroed
-                        * and otherwise fall back to buffers in userspace.
-                        */
-                       if (dev->xfer_buf[i][0] || memcmp(dev->xfer_buf[i],
-                                                         dev->xfer_buf[i] + 1,
-                                                         dev->xfer_buf_len - 1)) {
-                               fprintf(stderr, "Detected Kernel usbfs mmap() "
-                                               "bug, falling back to buffers "
-                                               "in userspace\n");
-                               dev->use_zerocopy = 0;
-                               break;
-                       }
-               } else {
-                       fprintf(stderr, "Failed to allocate zero-copy "
-                                       "buffer for transfer %d\nFalling "
-                                       "back to buffers in userspace\n", i);
-                       dev->use_zerocopy = 0;
-                       break;
-               }
-       }
-
-       /* zero-copy buffer allocation failed (partially or completely)
-        * we need to free the buffers again if already allocated */
-       if (!dev->use_zerocopy) {
-               for (i = 0; i < dev->xfer_buf_num; ++i) {
-                       if (dev->xfer_buf[i])
-                               libusb_dev_mem_free(dev->devh,
-                                                   dev->xfer_buf[i],
-                                                   dev->xfer_buf_len);
-               }
-       }
-#endif
-
        /* no zero-copy available, allocate buffers in userspace */
        if (!dev->use_zerocopy) {
                for (i = 0; i < dev->xfer_buf_num; ++i) {

~/sandbox/rtl-sdr# rtl_tcp -a 192.168.200.132 -f 89000 -b 100
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
[R82XX] PLL not locked!
Tuned to 89000 Hz.
listening...
Use the device argument 'rtl_tcp=192.168.200.132:1234' in OsmoSDR (gr-osmosdr) source
to receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...).
client accepted!
set gain mode 1
set agc mode 0
set direct sampling 0
Disabled direct sampling mode
[R82XX] PLL not locked!
set offset tuning 0
set bias tee 0
set sample rate 1800000
[R82XX] PLL not locked!
ll+, now 1
set freq 24000000
set gain 495
ll+, now 2
set gain 495
set gain 495
set freq 106661000
ll+, now 3
ll+, now 4
ll+, now 5
ll+, now 6