Re: [PATCH v1 2/5] firmware: thead: Add AON firmware protocol driver

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

Hi Michal,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.14-rc5 next-20250305]
[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/Michal-Wilczynski/dt-bindings-firmware-thead-th1520-Add-support-for-firmware-node/20250303-230224
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20250303145901.446791-3-m.wilczynski%40samsung.com
patch subject: [PATCH v1 2/5] firmware: thead: Add AON firmware protocol driver
config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20250306/202503060707.a8CwuQbH-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250306/202503060707.a8CwuQbH-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/202503060707.a8CwuQbH-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/firmware/thead,th1520-aon.c: In function 'th1520_aon_init':
   drivers/firmware/thead,th1520-aon.c:206:20: error: implicit declaration of function 'kzalloc' [-Werror=implicit-function-declaration]
     206 |         aon_chan = kzalloc(sizeof(*aon_chan), GFP_KERNEL);
         |                    ^~~~~~~
>> drivers/firmware/thead,th1520-aon.c:206:18: warning: assignment to 'struct th1520_aon_chan *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     206 |         aon_chan = kzalloc(sizeof(*aon_chan), GFP_KERNEL);
         |                  ^
   drivers/firmware/thead,th1520-aon.c:219:17: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration]
     219 |                 kfree(aon_chan);
         |                 ^~~~~
   cc1: some warnings being treated as errors


vim +206 drivers/firmware/thead,th1520-aon.c

   185	
   186	/**
   187	 * th1520_aon_init() - Initialize TH1520 AON firmware protocol interface
   188	 * @dev: Device pointer for the AON subsystem
   189	 *
   190	 * This function initializes the TH1520 AON firmware protocol interface by:
   191	 * - Allocating and initializing the AON channel structure
   192	 * - Setting up the mailbox client
   193	 * - Requesting the AON mailbox channel
   194	 * - Initializing synchronization primitives
   195	 *
   196	 * Return:
   197	 * * Valid pointer to th1520_aon_chan structure on success
   198	 * * ERR_PTR(-ENOMEM) if memory allocation fails
   199	 * * ERR_PTR() with other negative error codes from mailbox operations
   200	 */
   201	struct th1520_aon_chan *th1520_aon_init(struct device *dev)
   202	{
   203		struct th1520_aon_chan *aon_chan;
   204		struct mbox_client *cl;
   205	
 > 206		aon_chan = kzalloc(sizeof(*aon_chan), GFP_KERNEL);
   207		if (!aon_chan)
   208			return ERR_PTR(-ENOMEM);
   209	
   210		cl = &aon_chan->cl;
   211		cl->dev = dev;
   212		cl->tx_block = true;
   213		cl->tx_tout = MAX_TX_TIMEOUT;
   214		cl->rx_callback = th1520_aon_rx_callback;
   215	
   216		aon_chan->ch = mbox_request_channel_byname(cl, "aon");
   217		if (IS_ERR(aon_chan->ch)) {
   218			dev_err(dev, "Failed to request aon mbox chan\n");
   219			kfree(aon_chan);
   220			return ERR_CAST(aon_chan->ch);
   221		}
   222	
   223		mutex_init(&aon_chan->transaction_lock);
   224		init_completion(&aon_chan->done);
   225	
   226		return aon_chan;
   227	}
   228	EXPORT_SYMBOL_GPL(th1520_aon_init);
   229	

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