Re: [PATCH v2 2/3] scsi: ufs: core: Add ufshcd_wb_buf_resize function to enable WB buffer resize

kernel test robot
2023-09-08T14:12:22Z

Hi Lu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on jejb-scsi/for-next linus/master v6.5 next-20230908]
[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/Lu-Hongfei/scsi-ufs-core-add-wb-buffer-resize-related-attr_idn/20230908-182656
base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
patch link: https://lore.kernel.org/r/20230908102113.547-3-luhongfei%40vivo.com
patch subject: [PATCH v2 2/3] scsi: ufs: core: Add ufshcd_wb_buf_resize function to enable WB buffer resize
config: s390-randconfig-001-20230908 (https://download.01.org/0day-ci/archive/20230908/202309082109.DPcrgu3e-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230908/202309082109.DPcrgu3e-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/202309082109.DPcrgu3e-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from drivers/ufs/core/ufshcd.c:25:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from drivers/ufs/core/ufshcd.c:25:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from drivers/ufs/core/ufshcd.c:25:
In file included from include/linux/iopoll.h:14:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
692 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
700 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
708 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
717 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
726 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
735 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> drivers/ufs/core/ufshcd.c:6055:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
6055 | if (ufshcd_wait_for_doorbell_clr(hba, 1 * USEC_PER_SEC))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/ufs/core/ufshcd.c:6067:9: note: uninitialized use occurs here
6067 | return ret;
| ^~~
drivers/ufs/core/ufshcd.c:6055:2: note: remove the 'if' if its condition is always false
6055 | if (ufshcd_wait_for_doorbell_clr(hba, 1 * USEC_PER_SEC))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6056 | goto out;
| ~~~~~~~~~~~~~~~~~~~~~~~~
drivers/ufs/core/ufshcd.c:6051:9: note: initialize the variable 'ret' to silence this warning
6051 | int ret;
| ^
| = 0
13 warnings generated.

vim +6055 drivers/ufs/core/ufshcd.c

6048
6049 int ufshcd_wb_buf_resize(struct ufs_hba *hba, u32 resize_op)
6050 {
6051 int ret;
6052 u8 index;
6053
6054 ufshcd_scsi_block_requests(hba);
> 6055 if (ufshcd_wait_for_doorbell_clr(hba, 1 * USEC_PER_SEC))
6056 goto out;
6057
6058 index = ufshcd_wb_get_query_index(hba);
6059 ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
6060 QUERY_ATTR_IDN_WB_BUF_RESIZE_EN, index, 0, &resize_op);
6061 if (ret)
6062 dev_err(hba->dev,
6063 "%s: Enable WB buf resize operation failed %d\n",
6064 __func__, ret);
6065 out:
6066 ufshcd_scsi_unblock_requests(hba);
6067 return ret;
6068 }
6069

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