Shubhrajyoti's email address is dead. Also the rx function
omap2_mcspi_rx_dma() has the same issue.
regards,
dan carpenter
On Fri, Apr 11, 2014 at 02:20:21PM +0300, Dan Carpenter wrote:
> 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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