On 06/04/13 00:07, H Hartley Sweeten wrote:
The struct file_operations (*read) and (*write) operations expect the buffer to be a __user space pointer. Currently the (*write) operations in this driver cause this warning: warning: incorrect type in argument 2 (different address spaces) expected char const [noderef] <asn:1>*<noident> got unsigned char [usertype] *buf And the (*read) operations cause this warning: warning: incorrect type in argument 2 (different address spaces) expected char [noderef] <asn:1>*<noident> got unsigned char *<noident> Use __force to cast the buffer to a __user pointer to suppress the warnings.
The sparse warnings are probably helpful in this case. They indicate the driver is doing something wrong! Using __force just masks the problem.
-- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=- _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
