[PATCH] dma-buf: cma_heap: Check for device max segment size when attaching

[kernel test robot]

Hi Andrew,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.0-rc2 next-20220822]
[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/Andrew-Davis/dma-buf-cma_heap-Check-for-device-max-segment-size-when-attaching/20220823-073240
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20220823/202208230840.npLcmvVn-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/f390cef50ba6681ea767283e413cb8e9f8f2b426
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Andrew-Davis/dma-buf-cma_heap-Check-for-device-max-segment-size-when-attaching/20220823-073240
        git checkout f390cef50ba6681ea767283e413cb8e9f8f2b426
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/dma-buf/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   drivers/dma-buf/heaps/cma_heap.c: In function 'cma_heap_attach':
>> drivers/dma-buf/heaps/cma_heap.c:61:9: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
      61 |         size_t max_segment = dma_get_max_seg_size(attachment->dev);
         |         ^~~~~~


vim +61 drivers/dma-buf/heaps/cma_heap.c

    49	
    50	static int cma_heap_attach(struct dma_buf *dmabuf,
    51				   struct dma_buf_attachment *attachment)
    52	{
    53		struct cma_heap_buffer *buffer = dmabuf->priv;
    54		struct dma_heap_attachment *a;
    55		int ret;
    56	
    57		a = kzalloc(sizeof(*a), GFP_KERNEL);
    58		if (!a)
    59			return -ENOMEM;
    60	
  > 61		size_t max_segment = dma_get_max_seg_size(attachment->dev);
    62		ret = sg_alloc_table_from_pages_segment(&a->table, buffer->pages,
    63							buffer->pagecount, 0,
    64							buffer->pagecount << PAGE_SHIFT,
    65							max_segment, GFP_KERNEL);
    66		if (ret) {
    67			kfree(a);
    68			return ret;
    69		}
    70	
    71		a->dev = attachment->dev;
    72		INIT_LIST_HEAD(&a->list);
    73		a->mapped = false;
    74	
    75		attachment->priv = a;
    76	
    77		mutex_lock(&buffer->lock);
    78		list_add(&a->list, &buffer->attachments);
    79		mutex_unlock(&buffer->lock);
    80	
    81		return 0;
    82	}
    83	

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