Recently i use mcp2518fd on 4.x kernel which multiple write is not backported, regmap_raw_write will cause old kernel crash because the tx buffer in driver is smaller then 2K. Use regmap_bulk_write instead for compatibility. Signed-off-by: Su Yanjun <suyanjun218@xxxxxxxxx> --- drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c index 3dde52669343..ab8aad0a7594 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c @@ -932,6 +932,7 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv *priv) void *ram; u32 val = 0; int err; + int val_bytes = regmap_get_val_bytes(priv->map_reg); ecc->ecc_stat = 0; @@ -947,8 +948,8 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv *priv) if (!ram) return -ENOMEM; - err = regmap_raw_write(priv->map_reg, MCP251XFD_RAM_START, ram, - MCP251XFD_RAM_SIZE); + err = regmap_bulk_write(priv->map_reg, MCP251XFD_RAM_START, ram, + MCP251XFD_RAM_SIZE / val_bytes); kfree(ram); return err; -- 2.25.1
