linux-kernel - [PATCH v2 03/12] scsi: mpt3sas: Make MPI2_CONFIG_PAGE_RAID_VOL

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Date:   Sun,  6 Aug 2023 10:05:55 -0700
From:   James Seo <james@...iv.tech>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>
Cc:     James Seo <james@...iv.tech>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/12] scsi: mpt3sas: Make MPI2_CONFIG_PAGE_RAID_VOL_0::PhysDisk[] a flexible array

This terminal 1-length variable array can be directly converted into
a C99 flexible array member.

As all users of MPI2_CONFIG_PAGE_RAID_VOL_0 (Mpi2RaidVolPage0_t)
either calculate its size without depending on its sizeof() or do not
use PhysDisk[], no further source changes are required:

- mpt3sas_config.c:mpt3sas_config_get_number_pds() fetches a
  Mpi2RaidVolPage0_t for itself, but does not use PhysDisk[].

- mpt3sas_config.c:mpt3sas_config_get_raid_volume_pg0() fetches a
  Mpi2RaidVolPage0_t into a caller-provided buffer, and may fetch and
  write PhysDisk[] into that buffer depending on its sz argument.
  Its callers:

  - mpt3sas_scsih.c:scsih_get_resync(),
    mpt3sas_scsih.c:scsih_get_state(),
    mpt3sas_scsih.c:_scsih_search_responding_raid_devices(), and
    mpt3sas_scsih.c:_scsih_scan_for_devices_after_reset() all pass
    sizeof(Mpi2RaidVolPage0_t) as sz, but do not use PhysDisk[].

  - mpt3sas_scsih.c:_scsih_get_volume_capabilities() and
    mpt3sas_warpdrive.c:mpt3sas_init_warpdrive_properties()
    both calculate sz independently of sizeof(Mpi2RaidVolPage0_t)
    and allocate a suitable buffer before calling
    mpt3sas_config_get_raid_volume_pg0() and using PhysDisk[].

Signed-off-by: James Seo <james@...iv.tech>
---
 drivers/scsi/mpt3sas/mpi/mpi2_cnfg.h | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpi/mpi2_cnfg.h b/drivers/scsi/mpt3sas/mpi/mpi2_cnfg.h
index 12b656bd883d..55abfc00301e 100644
--- a/drivers/scsi/mpt3sas/mpi/mpi2_cnfg.h
+++ b/drivers/scsi/mpt3sas/mpi/mpi2_cnfg.h
@@ -1801,12 +1801,9 @@ typedef struct _MPI2_RAIDVOL0_SETTINGS {
 #define MPI2_RAIDVOL0_SETTING_ENABLE_WRITE_CACHING      (0x0002)
 
 /*
- *Host code (drivers, BIOS, utilities, etc.) should leave this define set to
- *one and check the value returned for NumPhysDisks at runtime.
+ *Host code (drivers, BIOS, utilities, etc.) should check the value returned
+ *for NumPhysDisks at runtime before using PhysDisk[].
  */
-#ifndef MPI2_RAID_VOL_PAGE_0_PHYSDISK_MAX
-#define MPI2_RAID_VOL_PAGE_0_PHYSDISK_MAX       (1)
-#endif
 
 typedef struct _MPI2_CONFIG_PAGE_RAID_VOL_0 {
 	MPI2_CONFIG_PAGE_HEADER Header;            /*0x00 */
@@ -1826,8 +1823,7 @@ typedef struct _MPI2_CONFIG_PAGE_RAID_VOL_0 {
 	U8                      Reserved2;         /*0x25 */
 	U8                      Reserved3;         /*0x26 */
 	U8                      InactiveStatus;    /*0x27 */
-	MPI2_RAIDVOL0_PHYS_DISK
-	PhysDisk[MPI2_RAID_VOL_PAGE_0_PHYSDISK_MAX]; /*0x28 */
+	MPI2_RAIDVOL0_PHYS_DISK PhysDisk[];        /*0x28 */
 } MPI2_CONFIG_PAGE_RAID_VOL_0,
 	*PTR_MPI2_CONFIG_PAGE_RAID_VOL_0,
 	Mpi2RaidVolPage0_t, *pMpi2RaidVolPage0_t;
-- 
2.39.2