A couple serial drivers I maintain check the value of tty->receive_room
to decide the max number of bytes to pull out of the UART's receive
FIFO and shove into a flip buffer.
After checking tty->receive room to decide how many bytes to read, one
of the drivers uses this sequence:
tty_prepare_flip_string_flags(...)
<fill up char buffer and flag buffer>
tty_flip_buffer_push(...)
The other uses
for (i=0; i<count; ++i)
uart_insert_char(...);
tty_flip_buffer_push(...);
But, starting with kernel 3.12.0, whenSMP is enabled, tty->receive_room
is always 0 and never changes. With SMP disabled, it seems to work the
way it always has.
Is use of tty->receive room no longer supported for SMP kernels?
How _should_ a serial driver decide how many rx characters there are
room for?
--
Grant Edwards grant.b.edwards Yow! What I need is a
at MATURE RELATIONSHIP with a
gmail.com FLOPPY DISK ...
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