[PATCH] tty: synclink_gt: switch from 'pci_' to 'dma_' API

From: Christophe JAILLET
Date: Thu Aug 06 2020 - 01:44:16 EST


The wrappers in include/linux/pci-dma-compat.h should go away.

The patch has been generated with the coccinelle script below and has been
hand modified to replace GFP_ with a correct flag.
It has been compile tested.

When memory is allocated in 'alloc_desc()' and 'alloc_bufs()', GFP_KERNEL
can be used because it is only called from a probe function and no lock is
acquired.
The call chain is:
init_one (the probe function)
--> device_init
--> alloc_dma_bufs
--> alloc_desc
--> alloc_bufs

@@
@@
- PCI_DMA_BIDIRECTIONAL
+ DMA_BIDIRECTIONAL

@@
@@
- PCI_DMA_TODEVICE
+ DMA_TO_DEVICE

@@
@@
- PCI_DMA_FROMDEVICE
+ DMA_FROM_DEVICE

@@
@@
- PCI_DMA_NONE
+ DMA_NONE

@@
expression e1, e2, e3;
@@
- pci_alloc_consistent(e1, e2, e3)
+ dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3;
@@
- pci_zalloc_consistent(e1, e2, e3)
+ dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3, e4;
@@
- pci_free_consistent(e1, e2, e3, e4)
+ dma_free_coherent(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_map_single(e1, e2, e3, e4)
+ dma_map_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_single(e1, e2, e3, e4)
+ dma_unmap_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4, e5;
@@
- pci_map_page(e1, e2, e3, e4, e5)
+ dma_map_page(&e1->dev, e2, e3, e4, e5)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_page(e1, e2, e3, e4)
+ dma_unmap_page(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_map_sg(e1, e2, e3, e4)
+ dma_map_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_unmap_sg(e1, e2, e3, e4)
+ dma_unmap_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_single_for_cpu(e1, e2, e3, e4)
+ dma_sync_single_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_single_for_device(e1, e2, e3, e4)
+ dma_sync_single_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_sg_for_cpu(e1, e2, e3, e4)
+ dma_sync_sg_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
- pci_dma_sync_sg_for_device(e1, e2, e3, e4)
+ dma_sync_sg_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2;
@@
- pci_dma_mapping_error(e1, e2)
+ dma_mapping_error(&e1->dev, e2)

@@
expression e1, e2;
@@
- pci_set_dma_mask(e1, e2)
+ dma_set_mask(&e1->dev, e2)

@@
expression e1, e2;
@@
- pci_set_consistent_dma_mask(e1, e2)
+ dma_set_coherent_mask(&e1->dev, e2)

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
drivers/tty/synclink_gt.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index b794177ccfb9..1edf06653148 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -3341,8 +3341,8 @@ static int alloc_desc(struct slgt_info *info)
unsigned int pbufs;

/* allocate memory to hold descriptor lists */
- info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
- &info->bufs_dma_addr);
+ info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
+ &info->bufs_dma_addr, GFP_KERNEL);
if (info->bufs == NULL)
return -ENOMEM;

@@ -3384,7 +3384,8 @@ static int alloc_desc(struct slgt_info *info)
static void free_desc(struct slgt_info *info)
{
if (info->bufs != NULL) {
- pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
+ dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
+ info->bufs, info->bufs_dma_addr);
info->bufs = NULL;
info->rbufs = NULL;
info->tbufs = NULL;
@@ -3395,7 +3396,9 @@ static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
{
int i;
for (i=0; i < count; i++) {
- if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
+ bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
+ &bufs[i].buf_dma_addr, GFP_KERNEL);
+ if (!bufs[i].buf)
return -ENOMEM;
bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
}
@@ -3408,7 +3411,8 @@ static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
for (i=0; i < count; i++) {
if (bufs[i].buf == NULL)
continue;
- pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
+ dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
+ bufs[i].buf_dma_addr);
bufs[i].buf = NULL;
}
}
--
2.25.1