static irqreturn_t jmb38x_ms_isr()

in host/jmb38x_ms.c [516:589]

• 65 lines of code
• 19 McCabe index (conditional complexity)

static irqreturn_t jmb38x_ms_isr(int irq, void *dev_id)
{
	struct memstick_host *msh = dev_id;
	struct jmb38x_ms_host *host = memstick_priv(msh);
	unsigned int irq_status;

	spin_lock(&host->lock);
	irq_status = readl(host->addr + INT_STATUS);
	dev_dbg(&host->chip->pdev->dev, "irq_status = %08x\n", irq_status);
	if (irq_status == 0 || irq_status == (~0)) {
		spin_unlock(&host->lock);
		return IRQ_NONE;
	}

	if (host->req) {
		if (irq_status & INT_STATUS_ANY_ERR) {
			if (irq_status & INT_STATUS_CRC_ERR)
				host->req->error = -EILSEQ;
			else if (irq_status & INT_STATUS_TPC_ERR) {
				dev_dbg(&host->chip->pdev->dev, "TPC_ERR\n");
				jmb38x_ms_complete_cmd(msh, 0);
			} else
				host->req->error = -ETIME;
		} else {
			if (host->cmd_flags & DMA_DATA) {
				if (irq_status & INT_STATUS_EOTRAN)
					host->cmd_flags |= FIFO_READY;
			} else {
				if (irq_status & (INT_STATUS_FIFO_RRDY
						  | INT_STATUS_FIFO_WRDY))
					jmb38x_ms_transfer_data(host);

				if (irq_status & INT_STATUS_EOTRAN) {
					jmb38x_ms_transfer_data(host);
					host->cmd_flags |= FIFO_READY;
				}
			}

			if (irq_status & INT_STATUS_EOTPC) {
				host->cmd_flags |= CMD_READY;
				if (host->cmd_flags & REG_DATA) {
					if (host->req->data_dir == READ) {
						host->io_word[0]
							= readl(host->addr
								+ TPC_P0);
						host->io_word[1]
							= readl(host->addr
								+ TPC_P1);
						host->io_pos = 8;

						jmb38x_ms_transfer_data(host);
					}
					host->cmd_flags |= FIFO_READY;
				}
			}
		}
	}

	if (irq_status & (INT_STATUS_MEDIA_IN | INT_STATUS_MEDIA_OUT)) {
		dev_dbg(&host->chip->pdev->dev, "media changed\n");
		memstick_detect_change(msh);
	}

	writel(irq_status, host->addr + INT_STATUS);

	if (host->req
	    && (((host->cmd_flags & CMD_READY)
		 && (host->cmd_flags & FIFO_READY))
		|| host->req->error))
		jmb38x_ms_complete_cmd(msh, 0);

	spin_unlock(&host->lock);
	return IRQ_HANDLED;
}