[linux-next:master 4765/6512] drivers/iommu/sprd-iommu.c:456:42: sparse: sparse: Using plain integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d949689e7383cd5271470f2b99dbe2fd3199bffd
commit: b23e4fc4e3faed0b8b604079c44a244da3ec941a [4765/6512] iommu: add Unisoc IOMMU basic driver
config: m68k-randconfig-s032-20210323 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-277-gc089cd2d-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b23e4fc4e3faed0b8b604079c44a244da3ec941a
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout b23e4fc4e3faed0b8b604079c44a244da3ec941a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>


sparse warnings: (new ones prefixed by >>)

quoted

drivers/iommu/sprd-iommu.c:456:42: sparse: sparse: Using plain integer as NULL pointer

   drivers/iommu/sprd-iommu.c: note: in included file (through arch/m68k/include/asm/io.h, include/linux/scatterlist.h, include/linux/dma-mapping.h):
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:299:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int volatile [usertype] @@     got restricted __le32 [usertype] @@
   include/asm-generic/io.h:299:9: sparse:     expected unsigned int volatile [usertype]
   include/asm-generic/io.h:299:9: sparse:     got restricted __le32 [usertype]
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32
   include/asm-generic/io.h:267:16: sparse: sparse: cast to restricted __le32

vim +456 drivers/iommu/sprd-iommu.c

   446	
   447	/*
   448	 * Clock is not required, access to some of IOMMUs is controlled by gate
   449	 * clk, enabled clocks for that kind of IOMMUs before accessing.
   450	 * Return 0 for success or no clocks found.
   451	 */
   452	static int sprd_iommu_clk_enable(struct sprd_iommu_device *sdev)
   453	{
   454		struct clk *eb;
   455	
 > 456		eb = clk_get_optional(sdev->dev, 0);
   457		if (!eb)
   458			return 0;
   459	
   460		if (IS_ERR(eb))
   461			return PTR_ERR(eb);
   462	
   463		sdev->eb = eb;
   464		return clk_prepare_enable(eb);
   465	}
   466	

---
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