[melver:cap-analysis/dev 14/26] drivers/dma-buf/dma-fence-chain.c:65:21: sparse: sparse: incorrect type in assignment (different base types)

[melver:cap-analysis/dev 14/26] drivers/dma-buf/dma-fence-chain.c:65:21: sparse: sparse: incorrect type in assignment (different base types)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/melver/linux.git cap-analysis/dev
head:   9c8d14ce8aff2d38bf494f5d5436a302e3236842
commit: f7039fb7b3a9459a6c5ed166c267bdf294492c1b [14/26] rcu: Support Clang's capability analysis
config: arc-randconfig-r112-20250213 (https://download.01.org/0day-ci/archive/20250214/202502140014.CYel5X8d-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20250214/202502140014.CYel5X8d-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502140014.CYel5X8d-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/dma-buf/dma-fence-chain.c:65:21: sparse: sparse: incorrect type in assignment (different base types) @@     expected struct dma_fence *tmp @@     got void @@
   drivers/dma-buf/dma-fence-chain.c:65:21: sparse:     expected struct dma_fence *tmp
   drivers/dma-buf/dma-fence-chain.c:65:21: sparse:     got void

vim +65 drivers/dma-buf/dma-fence-chain.c

7bf60c52e093d9 Christian König 2019-04-01  30  
7bf60c52e093d9 Christian König 2019-04-01  31  /**
7bf60c52e093d9 Christian König 2019-04-01  32   * dma_fence_chain_walk - chain walking function
7bf60c52e093d9 Christian König 2019-04-01  33   * @fence: current chain node
7bf60c52e093d9 Christian König 2019-04-01  34   *
7bf60c52e093d9 Christian König 2019-04-01  35   * Walk the chain to the next node. Returns the next fence or NULL if we are at
7bf60c52e093d9 Christian König 2019-04-01  36   * the end of the chain. Garbage collects chain nodes which are already
7bf60c52e093d9 Christian König 2019-04-01  37   * signaled.
7bf60c52e093d9 Christian König 2019-04-01  38   */
7bf60c52e093d9 Christian König 2019-04-01  39  struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence)
7bf60c52e093d9 Christian König 2019-04-01  40  {
7bf60c52e093d9 Christian König 2019-04-01  41  	struct dma_fence_chain *chain, *prev_chain;
7bf60c52e093d9 Christian König 2019-04-01  42  	struct dma_fence *prev, *replacement, *tmp;
7bf60c52e093d9 Christian König 2019-04-01  43  
7bf60c52e093d9 Christian König 2019-04-01  44  	chain = to_dma_fence_chain(fence);
7bf60c52e093d9 Christian König 2019-04-01  45  	if (!chain) {
7bf60c52e093d9 Christian König 2019-04-01  46  		dma_fence_put(fence);
7bf60c52e093d9 Christian König 2019-04-01  47  		return NULL;
7bf60c52e093d9 Christian König 2019-04-01  48  	}
7bf60c52e093d9 Christian König 2019-04-01  49  
7bf60c52e093d9 Christian König 2019-04-01  50  	while ((prev = dma_fence_chain_get_prev(chain))) {
7bf60c52e093d9 Christian König 2019-04-01  51  
7bf60c52e093d9 Christian König 2019-04-01  52  		prev_chain = to_dma_fence_chain(prev);
7bf60c52e093d9 Christian König 2019-04-01  53  		if (prev_chain) {
7bf60c52e093d9 Christian König 2019-04-01  54  			if (!dma_fence_is_signaled(prev_chain->fence))
7bf60c52e093d9 Christian König 2019-04-01  55  				break;
7bf60c52e093d9 Christian König 2019-04-01  56  
7bf60c52e093d9 Christian König 2019-04-01  57  			replacement = dma_fence_chain_get_prev(prev_chain);
7bf60c52e093d9 Christian König 2019-04-01  58  		} else {
7bf60c52e093d9 Christian König 2019-04-01  59  			if (!dma_fence_is_signaled(prev))
7bf60c52e093d9 Christian König 2019-04-01  60  				break;
7bf60c52e093d9 Christian König 2019-04-01  61  
7bf60c52e093d9 Christian König 2019-04-01  62  			replacement = NULL;
7bf60c52e093d9 Christian König 2019-04-01  63  		}
7bf60c52e093d9 Christian König 2019-04-01  64  
14374e3eee1b02 Christian König 2022-05-11 @65  		tmp = unrcu_pointer(cmpxchg(&chain->prev, RCU_INITIALIZER(prev),
14374e3eee1b02 Christian König 2022-05-11  66  					     RCU_INITIALIZER(replacement)));
7bf60c52e093d9 Christian König 2019-04-01  67  		if (tmp == prev)
7bf60c52e093d9 Christian König 2019-04-01  68  			dma_fence_put(tmp);
7bf60c52e093d9 Christian König 2019-04-01  69  		else
7bf60c52e093d9 Christian König 2019-04-01  70  			dma_fence_put(replacement);
7bf60c52e093d9 Christian König 2019-04-01  71  		dma_fence_put(prev);
7bf60c52e093d9 Christian König 2019-04-01  72  	}
7bf60c52e093d9 Christian König 2019-04-01  73  
7bf60c52e093d9 Christian König 2019-04-01  74  	dma_fence_put(fence);
7bf60c52e093d9 Christian König 2019-04-01  75  	return prev;
7bf60c52e093d9 Christian König 2019-04-01  76  }
7bf60c52e093d9 Christian König 2019-04-01  77  EXPORT_SYMBOL(dma_fence_chain_walk);
7bf60c52e093d9 Christian König 2019-04-01  78  

:::::: The code at line 65 was first introduced by commit
:::::: 14374e3eee1b02dbf162e1dd75b789373f07ef43 dma-buf: cleanup dma_fence_chain_walk

:::::: TO: Christian König <christian.koenig@amd.com>
:::::: CC: Christian König <christian.koenig@amd.com>

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