On 05/09/2014 02:12 PM, Arnd Bergmann wrote: > >> However, if we're going to have these devices I'm wondering if having >> /dev/portw and /dev/portl (or something like that) might not make sense, >> rather than requiring a system call per transaction. > > Actually the behavior of /dev/port for >1 byte writes seems questionable > already: There are very few devices on which writing to consecutive > port numbers makes sense. Normally you just want to write a series > of bytes (or 16/32 bit words) into the same port number instead, > as the outsb()/outsw()/outsl() functions do. > Indeed. I missed the detail that it increments the port index; it is virtually guaranteed to be bogus. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
