scsi: pm8001: Fix le32 values handling in pm80xx_chip_ssp_io_req()

[ Upstream commit 970404cc5744b1033b6ee601be4ef0e2d1fbcf72 ]

Make sure that the __le32 fields of struct ssp_ini_io_start_req are
manipulated after applying the correct endian conversion. That is, use
cpu_to_le32() for assigning values and le32_to_cpu() for consulting a field
value. In particular, make sure that the calculations for the 4G boundary
check are done using CPU endianness and *not* little endian values. With
these fixes, many sparse warnings are removed.

While at it, add blank lines after variable declarations and in some other
places to make this code more readable.

Link: https://lore.kernel.org/r/20220220031810.738362-11-damien.lemoal@opensource.wdc.com
Fixes: 0ecdf00ba6e5 ("[SCSI] pm80xx: 4G boundary fix.")
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index e606a9b1c3af68606f69926bf7f4688fd04ffcfc..d7a27627fce05066b66a78c52f4e27084510585a 100644 (file)
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -4381,13 +4381,15 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
        struct ssp_ini_io_start_req ssp_cmd;
        u32 tag = ccb->ccb_tag;
        int ret;
-       u64 phys_addr, start_addr, end_addr;
+       u64 phys_addr, end_addr;
        u32 end_addr_high, end_addr_low;
        struct inbound_queue_table *circularQ;
        u32 q_index, cpu_id;
        u32 opc = OPC_INB_SSPINIIOSTART;
+
        memset(&ssp_cmd, 0, sizeof(ssp_cmd));
        memcpy(ssp_cmd.ssp_iu.lun, task->ssp_task.LUN, 8);
+
        /* data address domain added for spcv; set to 0 by host,
         * used internally by controller
         * 0 for SAS 1.1 and SAS 2.0 compatible TLR
@@ -4398,7 +4400,7 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
        ssp_cmd.device_id = cpu_to_le32(pm8001_dev->device_id);
        ssp_cmd.tag = cpu_to_le32(tag);
        if (task->ssp_task.enable_first_burst)
-               ssp_cmd.ssp_iu.efb_prio_attr |= 0x80;
+               ssp_cmd.ssp_iu.efb_prio_attr = 0x80;
        ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_prio << 3);
        ssp_cmd.ssp_iu.efb_prio_attr |= (task->ssp_task.task_attr & 7);
        memcpy(ssp_cmd.ssp_iu.cdb, task->ssp_task.cmd->cmnd,
@@ -4430,21 +4432,24 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                        ssp_cmd.enc_esgl = cpu_to_le32(1<<31);
                } else if (task->num_scatter == 1) {
                        u64 dma_addr = sg_dma_address(task->scatter);
+
                        ssp_cmd.enc_addr_low =
                                cpu_to_le32(lower_32_bits(dma_addr));
                        ssp_cmd.enc_addr_high =
                                cpu_to_le32(upper_32_bits(dma_addr));
                        ssp_cmd.enc_len = cpu_to_le32(task->total_xfer_len);
                        ssp_cmd.enc_esgl = 0;
+
                        /* Check 4G Boundary */
-                       start_addr = cpu_to_le64(dma_addr);
-                       end_addr = (start_addr + ssp_cmd.enc_len) - 1;
-                       end_addr_low = cpu_to_le32(lower_32_bits(end_addr));
-                       end_addr_high = cpu_to_le32(upper_32_bits(end_addr));
-                       if (end_addr_high != ssp_cmd.enc_addr_high) {
+                       end_addr = dma_addr + le32_to_cpu(ssp_cmd.enc_len) - 1;
+                       end_addr_low = lower_32_bits(end_addr);
+                       end_addr_high = upper_32_bits(end_addr);
+
+                       if (end_addr_high != le32_to_cpu(ssp_cmd.enc_addr_high)) {
                                pm8001_dbg(pm8001_ha, FAIL,
                                           "The sg list address start_addr=0x%016llx data_len=0x%x end_addr_high=0x%08x end_addr_low=0x%08x has crossed 4G boundary\n",
-                                          start_addr, ssp_cmd.enc_len,
+                                          dma_addr,
+                                          le32_to_cpu(ssp_cmd.enc_len),
                                           end_addr_high, end_addr_low);
                                pm8001_chip_make_sg(task->scatter, 1,
                                        ccb->buf_prd);
@@ -4453,7 +4458,7 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                                        cpu_to_le32(lower_32_bits(phys_addr));
                                ssp_cmd.enc_addr_high =
                                        cpu_to_le32(upper_32_bits(phys_addr));
-                               ssp_cmd.enc_esgl = cpu_to_le32(1<<31);
+                               ssp_cmd.enc_esgl = cpu_to_le32(1U<<31);
                        }
                } else if (task->num_scatter == 0) {
                        ssp_cmd.enc_addr_low = 0;
@@ -4461,8 +4466,10 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                        ssp_cmd.enc_len = cpu_to_le32(task->total_xfer_len);
                        ssp_cmd.enc_esgl = 0;
                }
+
                /* XTS mode. All other fields are 0 */
-               ssp_cmd.key_cmode = 0x6 << 4;
+               ssp_cmd.key_cmode = cpu_to_le32(0x6 << 4);
+
                /* set tweak values. Should be the start lba */
                ssp_cmd.twk_val0 = cpu_to_le32((task->ssp_task.cmd->cmnd[2] << 24) |
                                                (task->ssp_task.cmd->cmnd[3] << 16) |
@@ -4484,20 +4491,22 @@ static int pm80xx_chip_ssp_io_req(struct pm8001_hba_info *pm8001_ha,
                        ssp_cmd.esgl = cpu_to_le32(1<<31);
                } else if (task->num_scatter == 1) {
                        u64 dma_addr = sg_dma_address(task->scatter);
+
                        ssp_cmd.addr_low = cpu_to_le32(lower_32_bits(dma_addr));
                        ssp_cmd.addr_high =
                                cpu_to_le32(upper_32_bits(dma_addr));
                        ssp_cmd.len = cpu_to_le32(task->total_xfer_len);
                        ssp_cmd.esgl = 0;
+
                        /* Check 4G Boundary */
-                       start_addr = cpu_to_le64(dma_addr);
-                       end_addr = (start_addr + ssp_cmd.len) - 1;
-                       end_addr_low = cpu_to_le32(lower_32_bits(end_addr));
-                       end_addr_high = cpu_to_le32(upper_32_bits(end_addr));
-                       if (end_addr_high != ssp_cmd.addr_high) {
+                       end_addr = dma_addr + le32_to_cpu(ssp_cmd.len) - 1;
+                       end_addr_low = lower_32_bits(end_addr);
+                       end_addr_high = upper_32_bits(end_addr);
+                       if (end_addr_high != le32_to_cpu(ssp_cmd.addr_high)) {
                                pm8001_dbg(pm8001_ha, FAIL,
                                           "The sg list address start_addr=0x%016llx data_len=0x%x end_addr_high=0x%08x end_addr_low=0x%08x has crossed 4G boundary\n",
-                                          start_addr, ssp_cmd.len,
+                                          dma_addr,
+                                          le32_to_cpu(ssp_cmd.len),
                                           end_addr_high, end_addr_low);
                                pm8001_chip_make_sg(task->scatter, 1,
                                        ccb->buf_prd);