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Message-ID: <202011131956.egklXLCS-lkp@intel.com>
Date:   Fri, 13 Nov 2020 19:37:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: drivers/mmc/host/moxart-mmc.c:260:7: warning: variable 'dma_time'
 set but not used

Hi Krzysztof,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   585e5b17b92dead8a3aca4e3c9876fbca5f7e0ba
commit: 54d8454436a205682bd89d66d8d9eedbc8452d15 mmc: host: Enable compile testing of multiple drivers
date:   10 weeks ago
config: h8300-randconfig-r013-20201105 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54d8454436a205682bd89d66d8d9eedbc8452d15
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 54d8454436a205682bd89d66d8d9eedbc8452d15
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:11,
                    from include/linux/list.h:9,
                    from include/linux/module.h:12,
                    from drivers/mmc/host/moxart-mmc.c:16:
   include/linux/scatterlist.h: In function 'sg_set_buf':
   include/asm-generic/page.h:93:50: warning: ordered comparison of pointer with null pointer [-Wextra]
      93 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
         |                                                  ^~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
     143 |  BUG_ON(!virt_addr_valid(buf));
         |  ^~~~~~
   include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
     143 |  BUG_ON(!virt_addr_valid(buf));
         |          ^~~~~~~~~~~~~~~
   drivers/mmc/host/moxart-mmc.c: In function 'moxart_transfer_dma':
>> drivers/mmc/host/moxart-mmc.c:260:7: warning: variable 'dma_time' set but not used [-Wunused-but-set-variable]
     260 |  long dma_time;
         |       ^~~~~~~~
   drivers/mmc/host/moxart-mmc.c: In function 'moxart_request':
>> drivers/mmc/host/moxart-mmc.c:398:7: warning: variable 'pio_time' set but not used [-Wunused-but-set-variable]
     398 |  long pio_time;
         |       ^~~~~~~~

vim +/dma_time +260 drivers/mmc/host/moxart-mmc.c

1b66e94e6b99953 Jonas Jensen      2014-04-09  256  
1b66e94e6b99953 Jonas Jensen      2014-04-09  257  static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host)
1b66e94e6b99953 Jonas Jensen      2014-04-09  258  {
feeef096a770d28 Heiner Kallweit   2017-03-26  259  	u32 len, dir_slave;
41f469cac2663a4 Nicholas Mc Guire 2016-07-25 @260  	long dma_time;
1b66e94e6b99953 Jonas Jensen      2014-04-09  261  	struct dma_async_tx_descriptor *desc = NULL;
1b66e94e6b99953 Jonas Jensen      2014-04-09  262  	struct dma_chan *dma_chan;
1b66e94e6b99953 Jonas Jensen      2014-04-09  263  
1b66e94e6b99953 Jonas Jensen      2014-04-09  264  	if (host->data_len == data->bytes_xfered)
1b66e94e6b99953 Jonas Jensen      2014-04-09  265  		return;
1b66e94e6b99953 Jonas Jensen      2014-04-09  266  
1b66e94e6b99953 Jonas Jensen      2014-04-09  267  	if (data->flags & MMC_DATA_WRITE) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  268  		dma_chan = host->dma_chan_tx;
1b66e94e6b99953 Jonas Jensen      2014-04-09  269  		dir_slave = DMA_MEM_TO_DEV;
1b66e94e6b99953 Jonas Jensen      2014-04-09  270  	} else {
1b66e94e6b99953 Jonas Jensen      2014-04-09  271  		dma_chan = host->dma_chan_rx;
1b66e94e6b99953 Jonas Jensen      2014-04-09  272  		dir_slave = DMA_DEV_TO_MEM;
1b66e94e6b99953 Jonas Jensen      2014-04-09  273  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  274  
1b66e94e6b99953 Jonas Jensen      2014-04-09  275  	len = dma_map_sg(dma_chan->device->dev, data->sg,
feeef096a770d28 Heiner Kallweit   2017-03-26  276  			 data->sg_len, mmc_get_dma_dir(data));
1b66e94e6b99953 Jonas Jensen      2014-04-09  277  
1b66e94e6b99953 Jonas Jensen      2014-04-09  278  	if (len > 0) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  279  		desc = dmaengine_prep_slave_sg(dma_chan, data->sg,
1b66e94e6b99953 Jonas Jensen      2014-04-09  280  					       len, dir_slave,
1b66e94e6b99953 Jonas Jensen      2014-04-09  281  					       DMA_PREP_INTERRUPT |
1b66e94e6b99953 Jonas Jensen      2014-04-09  282  					       DMA_CTRL_ACK);
1b66e94e6b99953 Jonas Jensen      2014-04-09  283  	} else {
1b66e94e6b99953 Jonas Jensen      2014-04-09  284  		dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n");
1b66e94e6b99953 Jonas Jensen      2014-04-09  285  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  286  
1b66e94e6b99953 Jonas Jensen      2014-04-09  287  	if (desc) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  288  		host->tx_desc = desc;
1b66e94e6b99953 Jonas Jensen      2014-04-09  289  		desc->callback = moxart_dma_complete;
1b66e94e6b99953 Jonas Jensen      2014-04-09  290  		desc->callback_param = host;
1b66e94e6b99953 Jonas Jensen      2014-04-09  291  		dmaengine_submit(desc);
1b66e94e6b99953 Jonas Jensen      2014-04-09  292  		dma_async_issue_pending(dma_chan);
1b66e94e6b99953 Jonas Jensen      2014-04-09  293  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  294  
1b66e94e6b99953 Jonas Jensen      2014-04-09  295  	data->bytes_xfered += host->data_remain;
1b66e94e6b99953 Jonas Jensen      2014-04-09  296  
1b66e94e6b99953 Jonas Jensen      2014-04-09  297  	dma_time = wait_for_completion_interruptible_timeout(
1b66e94e6b99953 Jonas Jensen      2014-04-09  298  		   &host->dma_complete, host->timeout);
1b66e94e6b99953 Jonas Jensen      2014-04-09  299  
1b66e94e6b99953 Jonas Jensen      2014-04-09  300  	dma_unmap_sg(dma_chan->device->dev,
1b66e94e6b99953 Jonas Jensen      2014-04-09  301  		     data->sg, data->sg_len,
feeef096a770d28 Heiner Kallweit   2017-03-26  302  		     mmc_get_dma_dir(data));
1b66e94e6b99953 Jonas Jensen      2014-04-09  303  }
1b66e94e6b99953 Jonas Jensen      2014-04-09  304  
1b66e94e6b99953 Jonas Jensen      2014-04-09  305  
1b66e94e6b99953 Jonas Jensen      2014-04-09  306  static void moxart_transfer_pio(struct moxart_host *host)
1b66e94e6b99953 Jonas Jensen      2014-04-09  307  {
1b66e94e6b99953 Jonas Jensen      2014-04-09  308  	struct mmc_data *data = host->mrq->cmd->data;
1b66e94e6b99953 Jonas Jensen      2014-04-09  309  	u32 *sgp, len = 0, remain, status;
1b66e94e6b99953 Jonas Jensen      2014-04-09  310  
1b66e94e6b99953 Jonas Jensen      2014-04-09  311  	if (host->data_len == data->bytes_xfered)
1b66e94e6b99953 Jonas Jensen      2014-04-09  312  		return;
1b66e94e6b99953 Jonas Jensen      2014-04-09  313  
1b66e94e6b99953 Jonas Jensen      2014-04-09  314  	sgp = sg_virt(host->cur_sg);
1b66e94e6b99953 Jonas Jensen      2014-04-09  315  	remain = host->data_remain;
1b66e94e6b99953 Jonas Jensen      2014-04-09  316  
1b66e94e6b99953 Jonas Jensen      2014-04-09  317  	if (data->flags & MMC_DATA_WRITE) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  318  		while (remain > 0) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  319  			if (moxart_wait_for_status(host, FIFO_URUN, &status)
1b66e94e6b99953 Jonas Jensen      2014-04-09  320  			     == -ETIMEDOUT) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  321  				data->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  322  				complete(&host->pio_complete);
1b66e94e6b99953 Jonas Jensen      2014-04-09  323  				return;
1b66e94e6b99953 Jonas Jensen      2014-04-09  324  			}
1b66e94e6b99953 Jonas Jensen      2014-04-09  325  			for (len = 0; len < remain && len < host->fifo_width;) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  326  				iowrite32(*sgp, host->base + REG_DATA_WINDOW);
1b66e94e6b99953 Jonas Jensen      2014-04-09  327  				sgp++;
1b66e94e6b99953 Jonas Jensen      2014-04-09  328  				len += 4;
1b66e94e6b99953 Jonas Jensen      2014-04-09  329  			}
1b66e94e6b99953 Jonas Jensen      2014-04-09  330  			remain -= len;
1b66e94e6b99953 Jonas Jensen      2014-04-09  331  		}
1b66e94e6b99953 Jonas Jensen      2014-04-09  332  
1b66e94e6b99953 Jonas Jensen      2014-04-09  333  	} else {
1b66e94e6b99953 Jonas Jensen      2014-04-09  334  		while (remain > 0) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  335  			if (moxart_wait_for_status(host, FIFO_ORUN, &status)
1b66e94e6b99953 Jonas Jensen      2014-04-09  336  			    == -ETIMEDOUT) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  337  				data->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  338  				complete(&host->pio_complete);
1b66e94e6b99953 Jonas Jensen      2014-04-09  339  				return;
1b66e94e6b99953 Jonas Jensen      2014-04-09  340  			}
1b66e94e6b99953 Jonas Jensen      2014-04-09  341  			for (len = 0; len < remain && len < host->fifo_width;) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  342  				/* SCR data must be read in big endian. */
1b66e94e6b99953 Jonas Jensen      2014-04-09  343  				if (data->mrq->cmd->opcode == SD_APP_SEND_SCR)
1b66e94e6b99953 Jonas Jensen      2014-04-09  344  					*sgp = ioread32be(host->base +
1b66e94e6b99953 Jonas Jensen      2014-04-09  345  							  REG_DATA_WINDOW);
1b66e94e6b99953 Jonas Jensen      2014-04-09  346  				else
1b66e94e6b99953 Jonas Jensen      2014-04-09  347  					*sgp = ioread32(host->base +
1b66e94e6b99953 Jonas Jensen      2014-04-09  348  							REG_DATA_WINDOW);
1b66e94e6b99953 Jonas Jensen      2014-04-09  349  				sgp++;
1b66e94e6b99953 Jonas Jensen      2014-04-09  350  				len += 4;
1b66e94e6b99953 Jonas Jensen      2014-04-09  351  			}
1b66e94e6b99953 Jonas Jensen      2014-04-09  352  			remain -= len;
1b66e94e6b99953 Jonas Jensen      2014-04-09  353  		}
1b66e94e6b99953 Jonas Jensen      2014-04-09  354  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  355  
1b66e94e6b99953 Jonas Jensen      2014-04-09  356  	data->bytes_xfered += host->data_remain - remain;
1b66e94e6b99953 Jonas Jensen      2014-04-09  357  	host->data_remain = remain;
1b66e94e6b99953 Jonas Jensen      2014-04-09  358  
1b66e94e6b99953 Jonas Jensen      2014-04-09  359  	if (host->data_len != data->bytes_xfered)
1b66e94e6b99953 Jonas Jensen      2014-04-09  360  		moxart_next_sg(host);
1b66e94e6b99953 Jonas Jensen      2014-04-09  361  	else
1b66e94e6b99953 Jonas Jensen      2014-04-09  362  		complete(&host->pio_complete);
1b66e94e6b99953 Jonas Jensen      2014-04-09  363  }
1b66e94e6b99953 Jonas Jensen      2014-04-09  364  
1b66e94e6b99953 Jonas Jensen      2014-04-09  365  static void moxart_prepare_data(struct moxart_host *host)
1b66e94e6b99953 Jonas Jensen      2014-04-09  366  {
1b66e94e6b99953 Jonas Jensen      2014-04-09  367  	struct mmc_data *data = host->mrq->cmd->data;
1b66e94e6b99953 Jonas Jensen      2014-04-09  368  	u32 datactrl;
1b66e94e6b99953 Jonas Jensen      2014-04-09  369  	int blksz_bits;
1b66e94e6b99953 Jonas Jensen      2014-04-09  370  
1b66e94e6b99953 Jonas Jensen      2014-04-09  371  	if (!data)
1b66e94e6b99953 Jonas Jensen      2014-04-09  372  		return;
1b66e94e6b99953 Jonas Jensen      2014-04-09  373  
1b66e94e6b99953 Jonas Jensen      2014-04-09  374  	host->data_len = data->blocks * data->blksz;
1b66e94e6b99953 Jonas Jensen      2014-04-09  375  	blksz_bits = ffs(data->blksz) - 1;
1b66e94e6b99953 Jonas Jensen      2014-04-09  376  	BUG_ON(1 << blksz_bits != data->blksz);
1b66e94e6b99953 Jonas Jensen      2014-04-09  377  
1b66e94e6b99953 Jonas Jensen      2014-04-09  378  	moxart_init_sg(host, data);
1b66e94e6b99953 Jonas Jensen      2014-04-09  379  
1b66e94e6b99953 Jonas Jensen      2014-04-09  380  	datactrl = DCR_DATA_EN | (blksz_bits & DCR_BLK_SIZE);
1b66e94e6b99953 Jonas Jensen      2014-04-09  381  
1b66e94e6b99953 Jonas Jensen      2014-04-09  382  	if (data->flags & MMC_DATA_WRITE)
1b66e94e6b99953 Jonas Jensen      2014-04-09  383  		datactrl |= DCR_DATA_WRITE;
1b66e94e6b99953 Jonas Jensen      2014-04-09  384  
1b66e94e6b99953 Jonas Jensen      2014-04-09  385  	if ((host->data_len > host->fifo_width) && host->have_dma)
1b66e94e6b99953 Jonas Jensen      2014-04-09  386  		datactrl |= DCR_DMA_EN;
1b66e94e6b99953 Jonas Jensen      2014-04-09  387  
1b66e94e6b99953 Jonas Jensen      2014-04-09  388  	writel(DCR_DATA_FIFO_RESET, host->base + REG_DATA_CONTROL);
1b66e94e6b99953 Jonas Jensen      2014-04-09  389  	writel(MASK_DATA | FIFO_URUN | FIFO_ORUN, host->base + REG_CLEAR);
1b66e94e6b99953 Jonas Jensen      2014-04-09  390  	writel(host->rate, host->base + REG_DATA_TIMER);
1b66e94e6b99953 Jonas Jensen      2014-04-09  391  	writel(host->data_len, host->base + REG_DATA_LENGTH);
1b66e94e6b99953 Jonas Jensen      2014-04-09  392  	writel(datactrl, host->base + REG_DATA_CONTROL);
1b66e94e6b99953 Jonas Jensen      2014-04-09  393  }
1b66e94e6b99953 Jonas Jensen      2014-04-09  394  
1b66e94e6b99953 Jonas Jensen      2014-04-09  395  static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq)
1b66e94e6b99953 Jonas Jensen      2014-04-09  396  {
1b66e94e6b99953 Jonas Jensen      2014-04-09  397  	struct moxart_host *host = mmc_priv(mmc);
41f469cac2663a4 Nicholas Mc Guire 2016-07-25 @398  	long pio_time;
41f469cac2663a4 Nicholas Mc Guire 2016-07-25  399  	unsigned long flags;
1b66e94e6b99953 Jonas Jensen      2014-04-09  400  	u32 status;
1b66e94e6b99953 Jonas Jensen      2014-04-09  401  
1b66e94e6b99953 Jonas Jensen      2014-04-09  402  	spin_lock_irqsave(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  403  
1b66e94e6b99953 Jonas Jensen      2014-04-09  404  	init_completion(&host->dma_complete);
1b66e94e6b99953 Jonas Jensen      2014-04-09  405  	init_completion(&host->pio_complete);
1b66e94e6b99953 Jonas Jensen      2014-04-09  406  
1b66e94e6b99953 Jonas Jensen      2014-04-09  407  	host->mrq = mrq;
1b66e94e6b99953 Jonas Jensen      2014-04-09  408  
1b66e94e6b99953 Jonas Jensen      2014-04-09  409  	if (readl(host->base + REG_STATUS) & CARD_DETECT) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  410  		mrq->cmd->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  411  		goto request_done;
1b66e94e6b99953 Jonas Jensen      2014-04-09  412  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  413  
1b66e94e6b99953 Jonas Jensen      2014-04-09  414  	moxart_prepare_data(host);
1b66e94e6b99953 Jonas Jensen      2014-04-09  415  	moxart_send_command(host, host->mrq->cmd);
1b66e94e6b99953 Jonas Jensen      2014-04-09  416  
1b66e94e6b99953 Jonas Jensen      2014-04-09  417  	if (mrq->cmd->data) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  418  		if ((host->data_len > host->fifo_width) && host->have_dma) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  419  
1b66e94e6b99953 Jonas Jensen      2014-04-09  420  			writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK);
1b66e94e6b99953 Jonas Jensen      2014-04-09  421  
1b66e94e6b99953 Jonas Jensen      2014-04-09  422  			spin_unlock_irqrestore(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  423  
1b66e94e6b99953 Jonas Jensen      2014-04-09  424  			moxart_transfer_dma(mrq->cmd->data, host);
1b66e94e6b99953 Jonas Jensen      2014-04-09  425  
1b66e94e6b99953 Jonas Jensen      2014-04-09  426  			spin_lock_irqsave(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  427  		} else {
1b66e94e6b99953 Jonas Jensen      2014-04-09  428  
1b66e94e6b99953 Jonas Jensen      2014-04-09  429  			writel(MASK_INTR_PIO, host->base + REG_INTERRUPT_MASK);
1b66e94e6b99953 Jonas Jensen      2014-04-09  430  
1b66e94e6b99953 Jonas Jensen      2014-04-09  431  			spin_unlock_irqrestore(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  432  
1b66e94e6b99953 Jonas Jensen      2014-04-09  433  			/* PIO transfers start from interrupt. */
1b66e94e6b99953 Jonas Jensen      2014-04-09  434  			pio_time = wait_for_completion_interruptible_timeout(
1b66e94e6b99953 Jonas Jensen      2014-04-09  435  				   &host->pio_complete, host->timeout);
1b66e94e6b99953 Jonas Jensen      2014-04-09  436  
1b66e94e6b99953 Jonas Jensen      2014-04-09  437  			spin_lock_irqsave(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  438  		}
1b66e94e6b99953 Jonas Jensen      2014-04-09  439  
1b66e94e6b99953 Jonas Jensen      2014-04-09  440  		if (host->is_removed) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  441  			dev_err(mmc_dev(host->mmc), "card removed\n");
1b66e94e6b99953 Jonas Jensen      2014-04-09  442  			mrq->cmd->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  443  			goto request_done;
1b66e94e6b99953 Jonas Jensen      2014-04-09  444  		}
1b66e94e6b99953 Jonas Jensen      2014-04-09  445  
1b66e94e6b99953 Jonas Jensen      2014-04-09  446  		if (moxart_wait_for_status(host, MASK_DATA, &status)
1b66e94e6b99953 Jonas Jensen      2014-04-09  447  		    == -ETIMEDOUT) {
1b66e94e6b99953 Jonas Jensen      2014-04-09  448  			mrq->cmd->data->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  449  			goto request_done;
1b66e94e6b99953 Jonas Jensen      2014-04-09  450  		}
1b66e94e6b99953 Jonas Jensen      2014-04-09  451  
1b66e94e6b99953 Jonas Jensen      2014-04-09  452  		if (status & DATA_CRC_FAIL)
1b66e94e6b99953 Jonas Jensen      2014-04-09  453  			mrq->cmd->data->error = -ETIMEDOUT;
1b66e94e6b99953 Jonas Jensen      2014-04-09  454  
1b66e94e6b99953 Jonas Jensen      2014-04-09  455  		if (mrq->cmd->data->stop)
1b66e94e6b99953 Jonas Jensen      2014-04-09  456  			moxart_send_command(host, mrq->cmd->data->stop);
1b66e94e6b99953 Jonas Jensen      2014-04-09  457  	}
1b66e94e6b99953 Jonas Jensen      2014-04-09  458  
1b66e94e6b99953 Jonas Jensen      2014-04-09  459  request_done:
1b66e94e6b99953 Jonas Jensen      2014-04-09  460  	spin_unlock_irqrestore(&host->lock, flags);
1b66e94e6b99953 Jonas Jensen      2014-04-09  461  	mmc_request_done(host->mmc, mrq);
1b66e94e6b99953 Jonas Jensen      2014-04-09  462  }
1b66e94e6b99953 Jonas Jensen      2014-04-09  463  

:::::: The code at line 260 was first introduced by commit
:::::: 41f469cac2663a41a7b0c84cb94e8f7024385ae4 mmc: moxart: fix wait_for_completion_interruptible_timeout return variable type

:::::: TO: Nicholas Mc Guire <hofrat@...dl.org>
:::::: CC: Ulf Hansson <ulf.hansson@...aro.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
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