[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Qemu serial patch
On 24/9/06 23:13, "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> wrote: > - qemu_chr_write(s->chr, &ch, 1); > + if (qemu_chr_write(s->chr, &ch, 1) == -1) > + fprintf(logfile, "serial write error\n"); > s->thr_ipending = 1; > s->lsr |= UART_LSR_THRE; > s->lsr |= UART_LSR_TEMT; > > Doesn't the above mean we still drop the character? Shouldn't we be > storing the character somewhere and retrying it later? We should > probably also clear the tx ready bit (bit 5) in the UART's Line Status > Register. We should then retry the write in ~100ms, and set the tx ready > bit again. There's not even any need to poll, if the serial fd is in the set of writefd's. Buffering internally to some reasonable limit and then clearing THRE until the fd appears in the pollset and some FIFO space is cleared is the right thing to do. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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