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| author | hselasky <hselasky@FreeBSD.org> | 2011-01-24 17:38:37 +0000 |
|---|---|---|
| committer | hselasky <hselasky@FreeBSD.org> | 2011-01-24 17:38:37 +0000 |
| commit | d0e4831ad198ca8ad6fd06008a4ad49a71be2cee (patch) | |
| tree | af1a8c29cf9d914a9d3723c4ef05a85baaf515ad | |
| parent | aec2294356812c27219b097226db9f5c589f1953 (diff) | |
| download | FreeBSD-src-d0e4831ad198ca8ad6fd06008a4ad49a71be2cee.zip FreeBSD-src-d0e4831ad198ca8ad6fd06008a4ad49a71be2cee.tar.gz | |
Add more sanity checks for USB_HOST_ALIGN input values. Re-factor existing
checks for readability.
Approved by: thompsa (mentor)
| -rw-r--r-- | sys/dev/usb/usb_freebsd.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/sys/dev/usb/usb_freebsd.h b/sys/dev/usb/usb_freebsd.h index 70dd383..a44e530 100644 --- a/sys/dev/usb/usb_freebsd.h +++ b/sys/dev/usb/usb_freebsd.h @@ -46,12 +46,15 @@ #define USB_TD_GET_PROC(td) (td)->td_proc #define USB_PROC_GET_GID(td) (td)->p_pgid -#if defined(USB_HOST_ALIGN) && (USB_HOST_ALIGN != 0) -/* USB_HOST_ALIGN is already defined and valid */ -#else +#if (!defined(USB_HOST_ALIGN)) || (USB_HOST_ALIGN <= 0) +/* Use default value. */ #undef USB_HOST_ALIGN #define USB_HOST_ALIGN 8 /* bytes, must be power of two */ #endif +/* Sanity check for USB_HOST_ALIGN: Verify power of two. */ +#if ((-USB_HOST_ALIGN) & USB_HOST_ALIGN) != USB_HOST_ALIGN +#error "USB_HOST_ALIGN is not power of two." +#endif #define USB_FS_ISOC_UFRAME_MAX 4 /* exclusive unit */ #define USB_BUS_MAX 256 /* units */ #define USB_MAX_DEVICES 128 /* units */ |
