netdev - Re: [PATCH v2 net-next 4/4] cxgb4: Add MPS refcounting for alloc/free mac filters

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Date:   Tue, 25 Jun 2019 00:59:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Raju Rangoju <rajur@...lsio.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org, davem@...emloft.net,
        nirranjan@...lsio.com, dt@...lsio.com, rajur@...lsio.com
Subject: Re: [PATCH v2 net-next 4/4] cxgb4: Add MPS refcounting for
 alloc/free mac filters

Hi Raju,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Raju-Rangoju/cxgb4-Reference-count-MPS-TCAM-entries-within-a-PF/20190624-230630
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-rc1-7-g2b96cd8-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c:17:51: sparse: sparse: incorrect type in argument 1 (different base types) @@    expected struct atomic_t [usertype] *v @@    got ct atomic_t [usertype] *v @@
>> drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c:17:51: sparse:    expected struct atomic_t [usertype] *v
>> drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c:17:51: sparse:    got struct refcount_struct *

vim +17 drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c

     5	
     6	static int cxgb4_mps_ref_dec_by_mac(struct adapter *adap,
     7					    const u8 *addr, const u8 *mask)
     8	{
     9		u8 bitmask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
    10		struct mps_entries_ref *mps_entry, *tmp;
    11		int ret = -EINVAL;
    12	
    13		spin_lock_bh(&adap->mps_ref_lock);
    14		list_for_each_entry_safe(mps_entry, tmp, &adap->mps_ref, list) {
    15			if (ether_addr_equal(mps_entry->addr, addr) &&
    16			    ether_addr_equal(mps_entry->mask, mask ? mask : bitmask)) {
  > 17				if (!atomic_dec_and_test(&mps_entry->refcnt)) {
    18					spin_unlock_bh(&adap->mps_ref_lock);
    19					return -EBUSY;
    20				}
    21				list_del(&mps_entry->list);
    22				kfree(mps_entry);
    23				ret = 0;
    24				break;
    25			}
    26		}
    27		spin_unlock_bh(&adap->mps_ref_lock);
    28		return ret;
    29	}
    30	

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