From 807464d8a7326e1025a2f392bf41636b0809d6da Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 14 Jun 2016 14:17:16 +0200 Subject: [PATCH] serial: make tsr_retry unsigned It can never become negative; reflect this in the type of the field and simplify the conditions. Tested-by: Bret Ketchum Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Paolo Bonzini --- hw/char/serial.c | 12 ++++++++---- include/hw/char/serial.h | 2 +- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/hw/char/serial.c b/hw/char/serial.c index 6d815b5c69..e65e9e0b4c 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -229,7 +229,7 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque) do { assert(!(s->lsr & UART_LSR_TEMT)); - if (s->tsr_retry <= 0) { + if (s->tsr_retry == 0) { assert(!(s->lsr & UART_LSR_THRE)); if (s->fcr & UART_FCR_FE) { @@ -252,7 +252,7 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque) /* in loopback mode, say that we just received a char */ serial_receive1(s, &s->tsr, 1); } else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) { - if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY && + if (s->tsr_retry < MAX_XMIT_RETRY && qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, serial_xmit, s) > 0) { s->tsr_retry++; @@ -330,7 +330,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val, s->lsr &= ~UART_LSR_THRE; s->lsr &= ~UART_LSR_TEMT; serial_update_irq(s); - if (s->tsr_retry <= 0) { + if (s->tsr_retry == 0) { serial_xmit(NULL, G_IO_OUT, s); } } @@ -639,6 +639,10 @@ static int serial_post_load(void *opaque, int version_id) if (s->thr_ipending == -1) { s->thr_ipending = ((s->iir & UART_IIR_ID) == UART_IIR_THRI); } + if (s->tsr_retry > MAX_XMIT_RETRY) { + s->tsr_retry = MAX_XMIT_RETRY; + } + s->last_break_enable = (s->lcr >> 6) & 1; /* Initialize fcr via setter to perform essential side-effects */ serial_write_fcr(s, s->fcr_vmstate); @@ -685,7 +689,7 @@ static const VMStateDescription vmstate_serial_tsr = { .minimum_version_id = 1, .needed = serial_tsr_needed, .fields = (VMStateField[]) { - VMSTATE_INT32(tsr_retry, SerialState), + VMSTATE_UINT32(tsr_retry, SerialState), VMSTATE_UINT8(thr, SerialState), VMSTATE_UINT8(tsr, SerialState), VMSTATE_END_OF_LIST() diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h index 15beb6b45c..6a322eb22e 100644 --- a/include/hw/char/serial.h +++ b/include/hw/char/serial.h @@ -55,7 +55,7 @@ struct SerialState { int last_break_enable; int it_shift; int baudbase; - int tsr_retry; + uint32_t tsr_retry; uint32_t wakeup; /* Time when the last byte was successfully sent out of the tsr */ -- 2.11.4.GIT