[PATCH 5/6] memory: renesas-rpc-if: Drop usage of RPCIF_DIRMAP_SIZE macro

Lad Prabhakar
2021-09-28T14:07:59Z

RPCIF_DIRMAP_SIZE may differ on various SoC's. Instead of using
RPCIF_DIRMAP_SIZE macro use resource size to get dirmap size
which is already part of struct rpcif.

Also make sure we return error in case devm_ioremap_resource()
fails for dirmap.

Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
Fixes: 59e27d7c94aa ("memory: renesas-rpc-if: fix possible NULL pointer dereference of resource")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
---
drivers/memory/renesas-rpc-if.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 77a011d5ff8c..140cb4e2b789 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -147,8 +147,6 @@
#define RPCIF_PHYINT 0x0088 /* R/W */
#define RPCIF_PHYINT_WPVAL BIT(1)

-#define RPCIF_DIRMAP_SIZE 0x4000000
-
static const struct regmap_range rpcif_volatile_ranges[] = {
regmap_reg_range(RPCIF_SMRDR0, RPCIF_SMRDR1),
regmap_reg_range(RPCIF_SMWDR0, RPCIF_SMWDR1),
@@ -244,7 +242,7 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rpc->dirmap))
- rpc->dirmap = NULL;
+ return PTR_ERR(rpc->dirmap);
rpc->size = resource_size(res);

rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
@@ -547,8 +545,8 @@ EXPORT_SYMBOL(rpcif_manual_xfer);

ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
{
- loff_t from = offs & (RPCIF_DIRMAP_SIZE - 1);
- size_t size = RPCIF_DIRMAP_SIZE - from;
+ loff_t from = offs & (rpc->size - 1);
+ size_t size = rpc->size - from;

if (len > size)
len = size;
--
2.17.1