vmk80xx_reset_device() is called during initialization of a Velleman K8055 (aka VM110) to send a reset command to the hardware. The current function is a bit long-winded and doesn't set the TRANS_OUT_BUSY flag to prevent re-use of the transmit buffer while the URB is in progress.
Rewrite the function to use vmk80xx_write_packet() to send the command. Signed-off-by: Ian Abbott <[email protected]> --- drivers/staging/comedi/drivers/vmk80xx.c | 44 +++++++------------------------- 1 file changed, 9 insertions(+), 35 deletions(-) diff --git a/drivers/staging/comedi/drivers/vmk80xx.c b/drivers/staging/comedi/drivers/vmk80xx.c index 0a74e6c..51859b8 100644 --- a/drivers/staging/comedi/drivers/vmk80xx.c +++ b/drivers/staging/comedi/drivers/vmk80xx.c @@ -277,41 +277,6 @@ static void vmk80xx_read_eeprom(struct vmk80xx_private *devpriv, int flag) strncpy(devpriv->fw.ic6_vers, rx + 25, 24); } -static int vmk80xx_reset_device(struct vmk80xx_private *devpriv) -{ - struct usb_device *usb = devpriv->usb; - unsigned char *tx_buf = devpriv->usb_tx_buf; - struct urb *urb; - unsigned int tx_pipe; - int ival; - size_t size; - - urb = usb_alloc_urb(0, GFP_KERNEL); - if (!urb) - return -ENOMEM; - - tx_pipe = usb_sndintpipe(usb, 0x01); - - ival = devpriv->ep_tx->bInterval; - size = le16_to_cpu(devpriv->ep_tx->wMaxPacketSize); - - tx_buf[0] = VMK8055_CMD_RST; - tx_buf[1] = 0x00; - tx_buf[2] = 0x00; - tx_buf[3] = 0x00; - tx_buf[4] = 0x00; - tx_buf[5] = 0x00; - tx_buf[6] = 0x00; - tx_buf[7] = 0x00; - - usb_fill_int_urb(urb, usb, tx_pipe, tx_buf, size, - vmk80xx_tx_callback, devpriv, ival); - - usb_anchor_urb(urb, &devpriv->tx_anchor); - - return usb_submit_urb(urb, GFP_KERNEL); -} - static void vmk80xx_build_int_urb(struct urb *urb, int flag) { struct vmk80xx_private *devpriv = urb->context; @@ -468,6 +433,15 @@ exit: return retval; } +static int vmk80xx_reset_device(struct vmk80xx_private *devpriv) +{ + size_t size; + + size = le16_to_cpu(devpriv->ep_tx->wMaxPacketSize); + memset(devpriv->usb_tx_buf, 0, size); + return vmk80xx_write_packet(devpriv, VMK8055_CMD_RST); +} + #define DIR_IN 1 #define DIR_OUT 2 -- 1.8.1.2 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
