linux-kernel - include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function

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Date:   Thu, 5 Dec 2019 16:25:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse'
 is used uninitialized in this function

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2f13437b8917627119d163d62f73e7a78a92303a
commit: 8259bf667a0f9ea1a37bb71c7af9ebd550e9251d spi: bcm2835: Speed up TX-only DMA transfers by clearing RX FIFO
date:   3 months ago
config: x86_64-randconfig-s0-20191205 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2
reproduce:
        git checkout 8259bf667a0f9ea1a37bb71c7af9ebd550e9251d
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   In file included from drivers/spi/spi-bcm2835.c:19:0:
   drivers/spi/spi-bcm2835.c: In function 'dmaengine_desc_set_reuse':
>> include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function [-Wuninitialized]
     if (caps.descriptor_reuse) {
             ^
--
   In file included from drivers//spi/spi-bcm2835.c:19:0:
   drivers//spi/spi-bcm2835.c: In function 'dmaengine_desc_set_reuse':
>> include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function [-Wuninitialized]
     if (caps.descriptor_reuse) {
             ^

vim +1370 include/linux/dmaengine.h

a8135d0d79e9d0 Peter Ujfalusi 2015-12-14  1363  
272420214d261e Vinod Koul     2015-08-05  1364  static inline int dmaengine_desc_set_reuse(struct dma_async_tx_descriptor *tx)
272420214d261e Vinod Koul     2015-08-05  1365  {
272420214d261e Vinod Koul     2015-08-05  1366  	struct dma_slave_caps caps;
272420214d261e Vinod Koul     2015-08-05  1367  
272420214d261e Vinod Koul     2015-08-05  1368  	dma_get_slave_caps(tx->chan, &caps);
272420214d261e Vinod Koul     2015-08-05  1369  
272420214d261e Vinod Koul     2015-08-05 @1370  	if (caps.descriptor_reuse) {
272420214d261e Vinod Koul     2015-08-05  1371  		tx->flags |= DMA_CTRL_REUSE;
272420214d261e Vinod Koul     2015-08-05  1372  		return 0;
272420214d261e Vinod Koul     2015-08-05  1373  	} else {
272420214d261e Vinod Koul     2015-08-05  1374  		return -EPERM;
272420214d261e Vinod Koul     2015-08-05  1375  	}
272420214d261e Vinod Koul     2015-08-05  1376  }
272420214d261e Vinod Koul     2015-08-05  1377  

:::::: The code at line 1370 was first introduced by commit
:::::: 272420214d261e97f08a4c555defb3924de06ae8 dmaengine: Add DMA_CTRL_REUSE

:::::: TO: Vinod Koul <vinod.koul@...el.com>
:::::: CC: Vinod Koul <vinod.koul@...el.com>

---
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