O > +static int f81534_set_normal_register(struct usb_device *dev, u16 reg, u8 > data) > +{ > + size_t count = F81534_USB_MAX_RETRY; > + int status; > + u8 *tmp; > + > + tmp = kmalloc(sizeof(u8), GFP_KERNEL); > + if (!tmp) > + return -ENOMEM;
You end up doing huge numbers of tiny allocation and frees in some of the code paths. I think it would be better to allocate them at a higher level as they are not that cheap on CPU time. > +static int f81534_read_data(struct usb_serial *usbserial, u32 address, > + size_t size, unsigned char *buf) > +{ Is a particularly good example - you do 4 mallocs plus two per byte of data. Alan