diff options
| author | Himadri Pandya <himadrispandya@gmail.com> | 2021-08-01 23:31:21 +0300 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2021-09-21 15:23:23 +0300 |
| commit | c9129371cb3d4847ce20a6bcb9708b14eeee665b (patch) | |
| tree | 73793068eb4dfc96738ae97e0ce0709047ed97c5 /drivers/usb/serial/keyspan_pda.c | |
| parent | a738859264981ae50986471ccd9c3bb096463c4f (diff) | |
| download | linux-c9129371cb3d4847ce20a6bcb9708b14eeee665b.tar.xz | |
USB: serial: keyspan_pda: use usb_control_msg_recv()
Use the wrapper function usb_control_msg_recv() that accepts stack
variables and remove dma buffers from callers of usb_control_msg().
Signed-off-by: Himadri Pandya <himadrispandya@gmail.com>
Link: https://lore.kernel.org/r/20210801203122.3515-6-himadrispandya@gmail.com
[ johan: simplify write-room error handling further ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/keyspan_pda.c')
| -rw-r--r-- | drivers/usb/serial/keyspan_pda.c | 67 |
1 files changed, 28 insertions, 39 deletions
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index 39b0f5f344c2..3e7628becdcd 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -77,36 +77,27 @@ static int keyspan_pda_get_write_room(struct keyspan_pda_private *priv) { struct usb_serial_port *port = priv->port; struct usb_serial *serial = port->serial; - u8 *room; + u8 room; int rc; - room = kmalloc(1, GFP_KERNEL); - if (!room) - return -ENOMEM; - - rc = usb_control_msg(serial->dev, - usb_rcvctrlpipe(serial->dev, 0), - 6, /* write_room */ - USB_TYPE_VENDOR | USB_RECIP_INTERFACE - | USB_DIR_IN, - 0, /* value: 0 means "remaining room" */ - 0, /* index */ - room, - 1, - 2000); - if (rc != 1) { - if (rc >= 0) - rc = -EIO; + rc = usb_control_msg_recv(serial->dev, + 0, + 6, /* write_room */ + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_IN, + 0, /* value: 0 means "remaining room" */ + 0, /* index */ + &room, + 1, + 2000, + GFP_KERNEL); + if (rc) { dev_dbg(&port->dev, "roomquery failed: %d\n", rc); - goto out_free; + return rc; } - dev_dbg(&port->dev, "roomquery says %d\n", *room); - rc = *room; -out_free: - kfree(room); + dev_dbg(&port->dev, "roomquery says %d\n", room); - return rc; + return room; } static void keyspan_pda_request_unthrottle(struct work_struct *work) @@ -381,22 +372,20 @@ static int keyspan_pda_get_modem_info(struct usb_serial *serial, unsigned char *value) { int rc; - u8 *data; - - data = kmalloc(1, GFP_KERNEL); - if (!data) - return -ENOMEM; - - rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), - 3, /* get pins */ - USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN, - 0, 0, data, 1, 2000); - if (rc == 1) - *value = *data; - else if (rc >= 0) - rc = -EIO; + u8 data; + + rc = usb_control_msg_recv(serial->dev, 0, + 3, /* get pins */ + USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_IN, + 0, + 0, + &data, + 1, + 2000, + GFP_KERNEL); + if (rc == 0) + *value = data; - kfree(data); return rc; } |