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net: dsa: qca8k: fix regmap bulk read/write methods on big endian systems 

Commit c766e077d9 ("net: dsa: qca8k: convert to regmap read/write
API") introduced bulk read/write methods to qca8k's regmap.

The regmap bulk read/write methods get the register address in a buffer
passed as a void pointer parameter (the same buffer contains also the
read/written values). The register address occupies only as many bytes
as it requires at the beginning of this buffer. For example if the
.reg_bits member in regmap_config is 16 (as is the case for this
driver), the register address occupies only the first 2 bytes in this
buffer, so it can be cast to u16.

But the original commit implementing these bulk read/write methods cast
the buffer to u32:
  u32 reg = *(u32 *)reg_buf & U16_MAX;
taking the first 4 bytes. This works on little endian systems where the
first 2 bytes of the buffer correspond to the low 16-bits, but it
obviously cannot work on big endian systems.

Fix this by casting the beginning of the buffer to u16 as
   u32 reg = *(u16 *)reg_buf;

Fixes: c766e077d9 ("net: dsa: qca8k: convert to regmap read/write API")
Signed-off-by: Marek Behún <kabel@kernel.org>
Tested-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marek Behún 2023-10-04 11:19:03 +02:00 committed by David S. Miller
parent 109c2de9ab
commit 5652d17415
1 changed files with 2 additions and 2 deletions
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4
drivers/net/dsa/qca/qca8k-8xxx.c
View File

@ -505,8 +505,8 @@ qca8k_bulk_read(void *ctx, const void *reg_buf, size_t reg_len,
void *val_buf, size_t val_len)
{
int i, count = val_len / sizeof(u32), ret;
u32 reg = *(u32 *)reg_buf & U16_MAX;
struct qca8k_priv *priv = ctx;
u32 reg = *(u16 *)reg_buf;
if (priv->mgmt_master &&
!qca8k_read_eth(priv, reg, val_buf, val_len))
@ -527,8 +527,8 @@ qca8k_bulk_gather_write(void *ctx, const void *reg_buf, size_t reg_len,
const void *val_buf, size_t val_len)
{
int i, count = val_len / sizeof(u32), ret;
u32 reg = *(u32 *)reg_buf & U16_MAX;
struct qca8k_priv *priv = ctx;
u32 reg = *(u16 *)reg_buf;
u32 *val = (u32 *)val_buf;
if (priv->mgmt_master &&