[PATCH 2/2] dmaengine: Add Arm DMA-350 driver

[kernel test robot]

Hi Robin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on linus/master v6.14-rc5 next-20250305]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Robin-Murphy/dt-bindings-dma-Add-Arm-DMA-350/20250301-012733
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
patch link:    https://lore.kernel.org/r/55e084dd2b5720bdddf503ffac560d111032aa96.1740762136.git.robin.murphy%40arm.com
patch subject: [PATCH 2/2] dmaengine: Add Arm DMA-350 driver
config: nios2-randconfig-r111-20250306 (https://download.01.org/0day-ci/archive/20250306/202503061910.eJW7M2H3-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 14.2.0
reproduce: (https://download.01.org/0day-ci/archive/20250306/202503061910.eJW7M2H3-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503061910.eJW7M2H3-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/dma/arm-dma350.c:485:31: sparse: sparse: dubious: !x & y
   drivers/dma/arm-dma350.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +485 drivers/dma/arm-dma350.c

   462	
   463	static irqreturn_t d350_irq(int irq, void *data)
   464	{
   465		struct d350_chan *dch = data;
   466		struct device *dev = dch->vc.chan.device->dev;
   467		struct virt_dma_desc *vd = &dch->desc->vd;
   468		u32 ch_status;
   469	
   470		ch_status = readl(dch->base + CH_STATUS);
   471		if (!ch_status)
   472			return IRQ_NONE;
   473	
   474		if (ch_status & CH_STAT_INTR_ERR) {
   475			u32 errinfo = readl_relaxed(dch->base + CH_ERRINFO);
   476	
   477			if (errinfo & (CH_ERRINFO_AXIRDPOISERR | CH_ERRINFO_AXIRDRESPERR))
   478				vd->tx_result.result = DMA_TRANS_READ_FAILED;
   479			else if (errinfo & CH_ERRINFO_AXIWRRESPERR)
   480				vd->tx_result.result = DMA_TRANS_WRITE_FAILED;
   481			else
   482				vd->tx_result.result = DMA_TRANS_ABORTED;
   483	
   484			vd->tx_result.residue = d350_get_residue(dch);
 > 485		} else if (!ch_status & CH_STAT_INTR_DONE) {
   486			dev_warn(dev, "Unexpected IRQ source? 0x%08x\n", ch_status);
   487		}
   488		writel_relaxed(ch_status, dch->base + CH_STATUS);
   489	
   490		spin_lock(&dch->vc.lock);
   491		vchan_cookie_complete(vd);
   492		if (ch_status & CH_STAT_INTR_DONE) {
   493			dch->status = DMA_COMPLETE;
   494			dch->residue = 0;
   495			d350_start_next(dch);
   496		} else {
   497			dch->status = DMA_ERROR;
   498			dch->residue = vd->tx_result.residue;
   499		}
   500		spin_unlock(&dch->vc.lock);
   501	
   502		return IRQ_HANDLED;
   503	}
   504	

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