diff options
| -rw-r--r-- | drivers/net/can/mcp251x.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c index 7f8aa4ce02c..c664be261e9 100644 --- a/drivers/net/can/mcp251x.c +++ b/drivers/net/can/mcp251x.c @@ -793,15 +793,20 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) /* receive buffer 0 */ if (intf & CANINTF_RX0IF) { mcp251x_hw_rx(spi, 0); - /* Free one buffer ASAP */ - mcp251x_write_bits(spi, CANINTF, intf & CANINTF_RX0IF, - 0x00); + /* + * Free one buffer ASAP + * (The MCP2515 does this automatically.) + */ + if (mcp251x_is_2510(spi)) + mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00); } /* receive buffer 1 */ if (intf & CANINTF_RX1IF) { mcp251x_hw_rx(spi, 1); - clear_intf |= CANINTF_RX1IF; + /* the MCP2515 does this automatically */ + if (mcp251x_is_2510(spi)) + clear_intf |= CANINTF_RX1IF; } /* any error or tx interrupt we need to clear? */ |