USB: ftdi_sio: Keep going when write errors are encountered.
The use of urb->actual_length to update tx_outstanding_bytes implicitly assumes that the number of bytes actually written is the same as the number of bytes we tried to write. On error that assumption is violated so just use transfer_buffer_length the number of bytes we intended to write to the device. If an error occurs we need to fall through and call usb_serial_port_softint to wake up processes waiting in tty_wait_until_sent. Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1937,7 +1937,7 @@ static void ftdi_write_bulk_callback(struct urb *urb)
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return;
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}
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/* account for transferred data */
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countback = urb->actual_length;
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countback = urb->transfer_buffer_length;
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data_offset = priv->write_offset;
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if (data_offset > 0) {
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/* Subtract the control bytes */
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@ -1950,7 +1950,6 @@ static void ftdi_write_bulk_callback(struct urb *urb)
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if (status) {
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dbg("nonzero write bulk status received: %d", status);
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return;
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}
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usb_serial_port_softint(port);
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