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lib: disable usbfs zero-copy support by default

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Although we added a detection mechanism for the presence of the Kernel
bug earlier, reading from the incorrectly mapped memory might cause a
bus error on some ARM systems.

With the overall performance benefit being rather minimal for the
data rates of rtl-sdr, disable zero-copy by default.
This commit is contained in:
Steve Markgraf
2019-07-16 23:45:57 +02:00
parent be1d1206bf
commit 81833a1cf6
3 changed files with 15 additions and 1 deletions
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2
src/librtlsdr.c
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@@ -1751,7 +1751,7 @@ 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
#if defined(ENABLE_ZEROCOPY) && defined (__linux__) && LIBUSB_API_VERSION >= 0x01000105
fprintf(stderr, "Allocating %d zero-copy buffers\n", dev->xfer_buf_num);
dev->use_zerocopy = 1;