diff options
Diffstat (limited to 'drivers/usb/serial/ch341.c')
| -rw-r--r-- | drivers/usb/serial/ch341.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 59eff721fcc5..9f4fed1968b5 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -22,6 +22,7 @@ #include <linux/usb.h> #include <linux/usb/serial.h> #include <linux/serial.h> +#include <asm/unaligned.h> #define DEFAULT_BAUD_RATE 9600 #define DEFAULT_TIMEOUT 1000 @@ -70,7 +71,7 @@ static int debug; -static struct usb_device_id id_table [] = { +static const struct usb_device_id id_table[] = { { USB_DEVICE(0x4348, 0x5523) }, { USB_DEVICE(0x1a86, 0x7523) }, { }, @@ -392,16 +393,22 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) struct usb_serial_port *port = tty->driver_data; int r; uint16_t reg_contents; - uint8_t break_reg[2]; + uint8_t *break_reg; dbg("%s()", __func__); + break_reg = kmalloc(2, GFP_KERNEL); + if (!break_reg) { + dev_err(&port->dev, "%s - kmalloc failed\n", __func__); + return; + } + r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, - ch341_break_reg, 0, break_reg, sizeof(break_reg)); + ch341_break_reg, 0, break_reg, 2); if (r < 0) { - printk(KERN_WARNING "%s: USB control read error whilst getting" - " break register contents.\n", __FILE__); - return; + dev_err(&port->dev, "%s - USB control read error (%d)\n", + __func__, r); + goto out; } dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x", __func__, break_reg[0], break_reg[1]); @@ -416,12 +423,14 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state) } dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x", __func__, break_reg[0], break_reg[1]); - reg_contents = (uint16_t)break_reg[0] | ((uint16_t)break_reg[1] << 8); + reg_contents = get_unaligned_le16(break_reg); r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, ch341_break_reg, reg_contents); if (r < 0) - printk(KERN_WARNING "%s: USB control write error whilst setting" - " break register contents.\n", __FILE__); + dev_err(&port->dev, "%s - USB control write error (%d)\n", + __func__, r); +out: + kfree(break_reg); } static int ch341_tiocmset(struct tty_struct *tty, struct file *file, |