On Friday 01 April 2016 07:22 PM, Dan Carpenter wrote:
Hello Laxman Dewangan,
The patch f333a331adfa: "spi/tegra114: add spi driver" from Feb 22,
2013, leads to the following static checker warning:
drivers/spi/spi-tegra114.c:621 tegra_spi_init_dma_param()
error: uninitialized variable 'dma_phys'.
drivers/spi/spi-tegra114.c
583 dma_addr_t dma_phys;
^^^^^^^^^^^^^^^^^^^
584 int ret;
585 struct dma_slave_config dma_sconfig;
586
587 dma_chan = dma_request_slave_channel_reason(tspi->dev,
588 dma_to_memory ? "rx" : "tx");
589 if (IS_ERR(dma_chan)) {
590 ret = PTR_ERR(dma_chan);
591 if (ret != -EPROBE_DEFER)
592 dev_err(tspi->dev,
593 "Dma channel is not available: %d\n", ret);
594 return ret;
595 }
596
597 dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
598 &dma_phys, GFP_KERNEL);
The issue is that in dma_alloc_attrs() if we can dma_alloc_from_coherent()
then dma_phys is not set. I'm getting a couple similar errors and I'm
not certian what to do about it.
The issue is with compiler actually.
we have code as
dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
&dma_phys, GFP_KERNEL);
if (!dma_buf) {
dev_err(tspi->dev, " Not able to allocate the dma
buffer\n");
dma_release_channel(dma_chan);
return -ENOMEM;
}
So if returned value "dma_buf" is not NULL then we can assume that
dma_phy is initialized other wise it should return NULL.
The static check is not able to find out that calling function has
initialized it or not.
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