Hello Feng-Hsin Chiang,
The patch 7d50195f6c50: "usb: host: Faraday fotg210-hcd driver" from
Jul 29, 2013, leads to the following static checker warning:
drivers/usb/host/fotg210-hcd.c:3967 iso_stream_init()
warn: mask and shift to zero
drivers/usb/host/fotg210-hcd.c
3944 static void iso_stream_init(struct fotg210_hcd *fotg210,
3945 struct fotg210_iso_stream *stream, struct usb_device
*dev,
3946 int pipe, unsigned interval)
3947 {
3948 u32 buf1;
3949 unsigned epnum, maxp;
3950 int is_input;
3951 long bandwidth;
3952 unsigned multi;
3953
3954 /*
3955 * this might be a "high bandwidth" highspeed endpoint,
3956 * as encoded in the ep descriptor's wMaxPacket field
3957 */
3958 epnum = usb_pipeendpoint(pipe);
3959 is_input = usb_pipein(pipe) ? USB_DIR_IN : 0;
3960 maxp = usb_maxpacket(dev, pipe, !is_input);
3961 if (is_input)
3962 buf1 = (1 << 11);
3963 else
3964 buf1 = 0;
3965
3966 maxp = max_packet(maxp);
3967 multi = hb_mult(maxp);
"multi" is always one. max_packet() takes the lower 11 bits and
hb_mult() shifts it to zero and adds one. Maybe introduce another
variable or calculate hb_mult() before max_packet().
3968 buf1 |= maxp;
3969 maxp *= multi;
3970
3971 stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum);
3972 stream->buf1 = cpu_to_hc32(fotg210, buf1);
3973 stream->buf2 = cpu_to_hc32(fotg210, multi);
regards,
dan carpenter
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