From 81833a1cf6288fee93a9157c0f60cafb5ec340b9 Mon Sep 17 00:00:00 2001 From: Steve Markgraf Date: Tue, 16 Jul 2019 23:45:57 +0200 Subject: lib: disable usbfs zero-copy support by default 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. --- src/librtlsdr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/librtlsdr.c') diff --git a/src/librtlsdr.c b/src/librtlsdr.c index d72a0f5..213e96c 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -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; -- cgit v1.2.3