Re: [net-next, 08/10] bng_en: Add irq allocation support

[kernel test robot <lkp@intel.com>]

Hi Vikas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.16-rc2 next-20250619]
[cannot apply to horms-ipvs/master]
[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/Vikas-Gupta/bng_en-Add-PCI-interface/20250618-173130
base:   linus/master
patch link:    https://lore.kernel.org/r/20250618144743.843815-9-vikas.gupta%40broadcom.com
patch subject: [net-next, 08/10] bng_en: Add irq allocation support
config: parisc-randconfig-r073-20250619 (https://download.01.org/0day-ci/archive/20250620/202506200530.jiD9Txum-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 8.5.0

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506200530.jiD9Txum-lkp@intel.com/

smatch warnings:
drivers/net/ethernet/broadcom/bnge/bnge_resc.c:347 bnge_alloc_irqs() warn: unsigned 'irqs_demand' is never less than zero.

vim +/irqs_demand +347 drivers/net/ethernet/broadcom/bnge/bnge_resc.c

   329	
   330	int bnge_alloc_irqs(struct bnge_dev *bd)
   331	{
   332		u16 aux_msix, tx_cp, num_entries;
   333		u16 irqs_demand, max, min = 1;
   334		int i, rc = 0;
   335	
   336		irqs_demand = bnge_nqs_demand(bd);
   337		max = bnge_get_max_func_irqs(bd);
   338		if (irqs_demand > max)
   339			irqs_demand = max;
   340	
   341		if (!(bd->flags & BNGE_EN_SHARED_CHNL))
   342			min = 2;
   343	
   344		irqs_demand = pci_alloc_irq_vectors(bd->pdev, min, irqs_demand,
   345						    PCI_IRQ_MSIX);
   346		aux_msix = bnge_aux_get_msix(bd);
 > 347		if (irqs_demand < 0 || irqs_demand < aux_msix) {
   348			rc = -ENODEV;
   349			goto err_free_irqs;
   350		}
   351	
   352		num_entries = irqs_demand;
   353		if (pci_msix_can_alloc_dyn(bd->pdev))
   354			num_entries = max;
   355		bd->irq_tbl = kcalloc(num_entries, sizeof(*bd->irq_tbl), GFP_KERNEL);
   356		if (!bd->irq_tbl) {
   357			rc = -ENOMEM;
   358			goto err_free_irqs;
   359		}
   360	
   361		for (i = 0; i < irqs_demand; i++)
   362			bd->irq_tbl[i].vector = pci_irq_vector(bd->pdev, i);
   363	
   364		bd->irqs_acquired = irqs_demand;
   365		/* Reduce rings based upon num of vectors allocated.
   366		 * We dont need to consider NQs as they have been calculated
   367		 * and must be more than irqs_demand.
   368		 */
   369		rc = bnge_adjust_rings(bd, &bd->rx_nr_rings,
   370				       &bd->tx_nr_rings,
   371				       irqs_demand - aux_msix, min == 1);
   372		if (rc)
   373			goto err_free_irqs;
   374	
   375		tx_cp = bnge_num_tx_to_cp(bd, bd->tx_nr_rings);
   376		bd->nq_nr_rings = (min == 1) ?
   377			max_t(u16, tx_cp, bd->rx_nr_rings) :
   378			tx_cp + bd->rx_nr_rings;
   379	
   380		/* Readjust tx_nr_rings_per_tc */
   381		if (!bd->num_tc)
   382			bd->tx_nr_rings_per_tc = bd->tx_nr_rings;
   383	
   384		return 0;
   385	
   386	err_free_irqs:
   387		dev_err(bd->dev, "Failed to allocate IRQs err = %d\n", rc);
   388		bnge_free_irqs(bd);
   389		return rc;
   390	}
   391	

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