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scsi: message: fusion: Replace one-element array with flexible-array member

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There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code
should always use "flexible array members"[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Also, this helps with the ongoing efforts to enable -Warray-bounds by
fixing the following warning:

drivers/message/fusion/mptbase.c: In function ‘mptbase_reply’:
drivers/message/fusion/mptbase.c:7747:62: warning: array subscript 1 is above array bounds of ‘U32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
 7747 |     ioc->events[idx].data[ii] = le32_to_cpu(pEventReply->Data[ii]);
./include/uapi/linux/byteorder/little_endian.h:34:51: note: in definition of macro ‘__le32_to_cpu’
   34 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
      |                                                   ^
drivers/message/fusion/mptbase.c:7747:33: note: in expansion of macro ‘le32_to_cpu’
 7747 |     ioc->events[idx].data[ii] = le32_to_cpu(pEventReply->Data[ii]);
      |

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Link: https://lore.kernel.org/r/20210324230036.GA67851@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Gustavo A. R. Silva 2021-03-24 18:00:36 -05:00 committed by Martin K. Petersen
parent 5b11c9d80b
commit ed46ccc7fe
1 changed files with 1 additions and 1 deletions
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drivers/message/fusion/lsi/mpi_ioc.h
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@ -448,7 +448,7 @@ typedef struct _MSG_EVENT_NOTIFY_REPLY
U32 IOCLogInfo; /* 10h */ U32 IOCLogInfo; /* 10h */
U32 Event; /* 14h */ U32 Event; /* 14h */
U32 EventContext; /* 18h */ U32 EventContext; /* 18h */
U32 Data[1]; /* 1Ch */ U32 Data[]; /* 1Ch */
} MSG_EVENT_NOTIFY_REPLY, MPI_POINTER PTR_MSG_EVENT_NOTIFY_REPLY, } MSG_EVENT_NOTIFY_REPLY, MPI_POINTER PTR_MSG_EVENT_NOTIFY_REPLY,
EventNotificationReply_t, MPI_POINTER pEventNotificationReply_t; EventNotificationReply_t, MPI_POINTER pEventNotificationReply_t;