re: spi: omap2-mcspi: Cleanup the omap2_mcspi_txrx_dma function

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hello Shubhrajyoti D,

This is a semi-automatic email about new static checker warnings.

The patch d7b4394e780b: "spi: omap2-mcspi: Cleanup the 
omap2_mcspi_txrx_dma function" from Sep 11, 2012, leads to the 
following Smatch complaint:

drivers/spi/spi-omap2-mcspi.c:425 omap2_mcspi_tx_dma()
	 error: we previously assumed 'mcspi_dma->dma_tx' could be null (see line 405)

drivers/spi/spi-omap2-mcspi.c
   404	
   405		if (mcspi_dma->dma_tx) {
                    ^^^^^^^^^^^^^^^^^
Check for NULL.

   406			struct dma_async_tx_descriptor *tx;
   407			struct scatterlist sg;
   408	
   409			dmaengine_slave_config(mcspi_dma->dma_tx, &cfg);
   410	
   411			sg_init_table(&sg, 1);
   412			sg_dma_address(&sg) = xfer->tx_dma;
   413			sg_dma_len(&sg) = xfer->len;
   414	
   415			tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1,
   416			DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
   417			if (tx) {
   418				tx->callback = omap2_mcspi_tx_callback;
   419				tx->callback_param = spi;
   420				dmaengine_submit(tx);
   421			} else {
   422				/* FIXME: fall back to PIO? */
   423			}
   424		}
   425		dma_async_issue_pending(mcspi_dma->dma_tx);
                                        ^^^^^^^^^^^^^^^^^
Dereferenced inside the function call.  Probably it should be moved
inside the if condition.

   426		omap2_mcspi_set_dma_req(spi, 0, 1);
   427	

regards,
dan carpenter
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