[PATCH 1/2] scsi: qla2xxx: replace non-standard flexible array purex_item.iocb

[Chris Leech <cleech@redhat.com>]

This is defined as a 64-element u8 array, but 64 is the minimum size and
it can be allocated larger. I don't know why the array was wrapped as a
single element struct of the same name.

Replace with a union around DECLARE_FLEX_ARRAY and padding to maintain
sizeof(struct purex_item) and associated use.

This was triggering a field-spanning write warning during FPIN testing
https://lore.kernel.org/linux-nvme/20250709211919.49100-1-bgurney@redhat.com/

  >  kernel: memcpy: detected field-spanning write (size 60) of single field
  >  "((uint8_t *)fpin_pkt + buffer_copy_offset)"
  >  at drivers/scsi/qla2xxx/qla_isr.c:1221 (size 44)

Tested-by: Bryan Gurney <bgurney@redhat.com>
Signed-off-by: Chris Leech <cleech@redhat.com>
---
 drivers/scsi/qla2xxx/qla_def.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index cb95b7b12051d..6237fefeca149 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -4890,8 +4890,9 @@ struct purex_item {
 			     struct purex_item *pkt);
 	atomic_t in_use;
 	uint16_t size;
-	struct {
-		uint8_t iocb[64];
+	union {
+		uint8_t __padding[QLA_DEFAULT_PAYLOAD_SIZE];
+		DECLARE_FLEX_ARRAY(uint8_t, iocb);
 	} iocb;
 };
 
-- 
2.50.1