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lib: special handling of dongle disconnect for OS != win32

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libusb reacts differently to a device loss during runtime,
and sporadic errors can happen when starting a second
instance interfacing another dongle, thus we need to wait
for all transfers to fail before assuming the dongle has
been removed.

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Steve Markgraf 2013-02-17 16:43:29 +01:00
parent ea4dbd242d
commit f1803fe10f
1 changed files with 17 additions and 5 deletions
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22
src/librtlsdr.c
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@ -90,6 +90,7 @@ struct rtlsdr_dev {
int gain; /* tenth dB */
struct e4k_state e4k_s;
int dev_lost;
unsigned int xfer_errors;
};
void rtlsdr_set_gpio_bit(rtlsdr_dev_t *dev, uint8_t gpio, int val);
@ -1507,11 +1508,22 @@ static void LIBUSB_CALL _libusb_callback(struct libusb_transfer *xfer)
dev->cb(xfer->buffer, xfer->actual_length, dev->cb_ctx);
libusb_submit_transfer(xfer); /* resubmit transfer */
} else if (LIBUSB_TRANSFER_CANCELLED != xfer->status &&
LIBUSB_TRANSFER_COMPLETED != xfer->status) {
dev->dev_lost = 1;
rtlsdr_cancel_async(dev);
fprintf(stderr, "cb transfer status: %d, canceling...\n", xfer->status);
dev->xfer_errors = 0;
} else if (LIBUSB_TRANSFER_CANCELLED != xfer->status) {
#ifndef _WIN32
if (LIBUSB_TRANSFER_ERROR == xfer->status)
dev->xfer_errors++;
if (dev->xfer_errors >= dev->xfer_buf_num ||
LIBUSB_TRANSFER_NO_DEVICE == xfer->status) {
#endif
dev->dev_lost = 1;
rtlsdr_cancel_async(dev);
fprintf(stderr, "cb transfer status: %d, "
"canceling...\n", xfer->status);
#ifndef _WIN32
}
#endif
}
}