[PATCH] scsi: megaraid_sas: handle dma_addr_t right on 32-bit

[Arnd Bergmann]

When building with a dma_addr_t that is different from pointer size, we get
this warning:

drivers/scsi/megaraid/megaraid_sas_fusion.c: In function 
'megasas_make_prp_nvme':
drivers/scsi/megaraid/megaraid_sas_fusion.c:1654:17: error: cast to pointer 
from integer of different size [-Werror=int-to-pointer-cast]

It's better to not pretend that the dma address is a pointer and instead
use a dma_addr_t consistently.

Fixes: 33203bc4d61b ("scsi: megaraid_sas: NVME fast path io support")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c 
b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 750090119f81..29650ba669da 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -1619,7 +1619,8 @@ megasas_make_prp_nvme(struct megasas_instance *instance, 
struct scsi_cmnd *scmd,
 {
        int sge_len, offset, num_prp_in_chain = 0;
        struct MPI25_IEEE_SGE_CHAIN64 *main_chain_element, *ptr_first_sgl;
-       u64 *ptr_sgl, *ptr_sgl_phys;
+       u64 *ptr_sgl;
+       dma_addr_t ptr_sgl_phys;
        u64 sge_addr;
        u32 page_mask, page_mask_result;
        struct scatterlist *sg_scmd;
@@ -1651,14 +1652,14 @@ megasas_make_prp_nvme(struct megasas_instance 
*instance, struct scsi_cmnd *scmd,
         */
        page_mask = mr_nvme_pg_size - 1;
        ptr_sgl = (u64 *)cmd->sg_frame;
-       ptr_sgl_phys = (u64 *)cmd->sg_frame_phys_addr;
+       ptr_sgl_phys = cmd->sg_frame_phys_addr;
        memset(ptr_sgl, 0, instance->max_chain_frame_sz);
 
        /* Build chain frame element which holds all prps except first*/
        main_chain_element = (struct MPI25_IEEE_SGE_CHAIN64 *)
            ((u8 *)sgl_ptr + sizeof(struct MPI25_IEEE_SGE_CHAIN64));
 
-       main_chain_element->Address = cpu_to_le64((uintptr_t)ptr_sgl_phys);
+       main_chain_element->Address = cpu_to_le64(ptr_sgl_phys);
        main_chain_element->NextChainOffset = 0;
        main_chain_element->Flags = IEEE_SGE_FLAGS_CHAIN_ELEMENT |
                                        IEEE_SGE_FLAGS_SYSTEM_ADDR |
@@ -1696,16 +1697,15 @@ megasas_make_prp_nvme(struct megasas_instance 
*instance, struct scsi_cmnd *scmd,
                        scmd_printk(KERN_NOTICE,
                                    scmd, "page boundary ptr_sgl: 0x%p\n",
                                    ptr_sgl);
-                       ptr_sgl_phys++;
-                       *ptr_sgl =
-                               cpu_to_le64((uintptr_t)ptr_sgl_phys);
+                       ptr_sgl_phys += 8;
+                       *ptr_sgl = cpu_to_le64(ptr_sgl_phys);
                        ptr_sgl++;
                        num_prp_in_chain++;
                }
 
                *ptr_sgl = cpu_to_le64(sge_addr);
                ptr_sgl++;
-               ptr_sgl_phys++;
+               ptr_sgl_phys += 8;
                num_prp_in_chain++;
 
                sge_addr += mr_nvme_pg_size;
-- 
2.9.0