target/linux/bcm27xx/patches-5.15/950-0671-misc-bcm2835_smi-Use-proper-enum-types-for-dma_-un-m.patch

   1 From db1007fae024ae65b6f8a28988ce9d87c7d92995 Mon Sep 17 00:00:00 2001
   2 From: Nathan Chancellor <nathan@kernel.org>
   3 Date: Mon, 31 Jan 2022 17:12:10 -0700
   4 Subject: [PATCH] misc: bcm2835_smi: Use proper enum types for
   5  dma_{,un}map_single()
   6
   7 Clang warns:
   8
   9   drivers/misc/bcm2835_smi.c:692:4: warning: implicit conversion from enumeration type 'enum dma_transfer_direction' to different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
  10                           DMA_MEM_TO_DEV);
  11                           ^~~~~~~~~~~~~~~
  12   ./include/linux/dma-mapping.h:406:66: note: expanded from macro 'dma_map_single'
  13   #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
  14                                      ~~~~~~~~~~~~~~~~~~~~          ^
  15   drivers/misc/bcm2835_smi.c:705:35: warning: implicit conversion from enumeration type 'enum dma_transfer_direction' to different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
  16                           (inst->dev, phy_addr, n_bytes, DMA_MEM_TO_DEV);
  17                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
  18   ./include/linux/dma-mapping.h:407:70: note: expanded from macro 'dma_unmap_single'
  19   #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
  20                                        ~~~~~~~~~~~~~~~~~~~~~~          ^
  21   drivers/misc/bcm2835_smi.c:751:12: warning: implicit conversion from enumeration type 'enum dma_transfer_direction' to different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
  22                                                        DMA_DEV_TO_MEM);
  23                                                        ^~~~~~~~~~~~~~~
  24   ./include/linux/dma-mapping.h:406:66: note: expanded from macro 'dma_map_single'
  25   #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
  26                                      ~~~~~~~~~~~~~~~~~~~~          ^
  27   drivers/misc/bcm2835_smi.c:761:50: warning: implicit conversion from enumeration type 'enum dma_transfer_direction' to different enumeration type 'enum dma_data_direction' [-Wenum-conversion]
  28                   dma_unmap_single(inst->dev, phy_addr, n_bytes, DMA_DEV_TO_MEM);
  29                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
  30   ./include/linux/dma-mapping.h:407:70: note: expanded from macro 'dma_unmap_single'
  31   #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
  32                                        ~~~~~~~~~~~~~~~~~~~~~~          ^
  33   4 warnings generated.
  34
  35 Use the proper enumerated type to clear up the warning. There is not
  36 actually a bug here because the enumerated types have the same integer
  37 value:
  38
  39 DMA_MEM_TO_DEV = DMA_TO_DEVICE = 1
  40 DMA_DEV_TO_MEM = DMA_FROM_DEVICE = 2
  41
  42 Fixes: 93254d0f7bc8 ("Add SMI driver")
  43 Signed-off-by: Nathan Chancellor <nathan@kernel.org>
  44 ---
  45  drivers/misc/bcm2835_smi.c | 8 ++++----
  46  1 file changed, 4 insertions(+), 4 deletions(-)
  47
  48 --- a/drivers/misc/bcm2835_smi.c
  49 +++ b/drivers/misc/bcm2835_smi.c
  50 @@ -689,7 +689,7 @@ void bcm2835_smi_write_buf(
  51                         inst->dev,
  52                         (void *)buf,
  53                         n_bytes,
  54 -                       DMA_MEM_TO_DEV);
  55 +                       DMA_TO_DEVICE);
  56                 struct scatterlist *sgl =
  57                         smi_scatterlist_from_buffer(inst, phy_addr, n_bytes,
  58                                 &inst->buffer_sgl);
  59 @@ -702,7 +702,7 @@ void bcm2835_smi_write_buf(
  60                 smi_dma_write_sgl(inst, sgl, 1, n_bytes);
  61
  62                 dma_unmap_single
  63 -                       (inst->dev, phy_addr, n_bytes, DMA_MEM_TO_DEV);
  64 +                       (inst->dev, phy_addr, n_bytes, DMA_TO_DEVICE);
  65         } else if (n_bytes) {
  66                 smi_write_fifo(inst, (uint32_t *) buf, n_bytes);
  67         }
  68 @@ -748,7 +748,7 @@ void bcm2835_smi_read_buf(struct bcm2835
  69         if (n_bytes > DMA_THRESHOLD_BYTES) {
  70                 dma_addr_t phy_addr = dma_map_single(inst->dev,
  71                                                      buf, n_bytes,
  72 -                                                    DMA_DEV_TO_MEM);
  73 +                                                    DMA_FROM_DEVICE);
  74                 struct scatterlist *sgl = smi_scatterlist_from_buffer(
  75                         inst, phy_addr, n_bytes,
  76                         &inst->buffer_sgl);
  77 @@ -758,7 +758,7 @@ void bcm2835_smi_read_buf(struct bcm2835
  78                         goto out;
  79                 }
  80                 smi_dma_read_sgl(inst, sgl, 1, n_bytes);
  81 -               dma_unmap_single(inst->dev, phy_addr, n_bytes, DMA_DEV_TO_MEM);
  82 +               dma_unmap_single(inst->dev, phy_addr, n_bytes, DMA_FROM_DEVICE);
  83         } else if (n_bytes) {
  84                 smi_read_fifo(inst, (uint32_t *)buf, n_bytes);
  85         }