static int rio_clr_err_stopped()

in rio.c [1079:1160]

• 61 lines of code
• 10 McCabe index (conditional complexity)

static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
{
	struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
	u32 regval;
	u32 far_ackid, far_linkstat, near_ackid;

	if (err_status == 0)
		rio_read_config_32(rdev,
			RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
			&err_status);

	if (err_status & RIO_PORT_N_ERR_STS_OUT_ES) {
		pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
		/*
		 * Send a Link-Request/Input-Status control symbol
		 */
		if (rio_get_input_status(rdev, pnum, &regval)) {
			pr_debug("RIO_EM: Input-status response timeout\n");
			goto rd_err;
		}

		pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
			 pnum, regval);
		far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
		far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
		rio_read_config_32(rdev,
			RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
			&regval);
		pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
		near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
		pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
			 " near_ackID=0x%02x\n",
			pnum, far_ackid, far_linkstat, near_ackid);

		/*
		 * If required, synchronize ackIDs of near and
		 * far sides.
		 */
		if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
		    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
			/* Align near outstanding/outbound ackIDs with
			 * far inbound.
			 */
			rio_write_config_32(rdev,
				RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
				(near_ackid << 24) |
					(far_ackid << 8) | far_ackid);
			/* Align far outstanding/outbound ackIDs with
			 * near inbound.
			 */
			far_ackid++;
			if (!nextdev) {
				pr_debug("RIO_EM: nextdev pointer == NULL\n");
				goto rd_err;
			}

			rio_write_config_32(nextdev,
				RIO_DEV_PORT_N_ACK_STS_CSR(nextdev,
					RIO_GET_PORT_NUM(nextdev->swpinfo)),
				(far_ackid << 24) |
				(near_ackid << 8) | near_ackid);
		}
rd_err:
		rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
				   &err_status);
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

	if ((err_status & RIO_PORT_N_ERR_STS_INP_ES) && nextdev) {
		pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
		rio_get_input_status(nextdev,
				     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
		udelay(50);

		rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
				   &err_status);
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

	return (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
			      RIO_PORT_N_ERR_STS_INP_ES)) ? 1 : 0;
}