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cadence_uart: Protect against transmit errors 

If qemu_chr_fe_write() returns an error (represented by a negative
number) we should skip incrementing the count and initiating a
memmove().

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 667e5dc534d33338fcfc2471e5aa32fe7cbd13dc.1466546703.git.alistair.francis@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alistair Francis 2016-06-27 15:37:32 +01:00 committed by Peter Maydell
parent 92b30c2f7d
commit f6cf41932e
1 changed files with 5 additions and 2 deletions
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7
hw/char/cadence_uart.c
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@ -288,8 +288,11 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond,
}
ret = qemu_chr_fe_write(s->chr, s->tx_fifo, s->tx_count);
s->tx_count -= ret;
memmove(s->tx_fifo, s->tx_fifo + ret, s->tx_count);
if (ret >= 0) {
s->tx_count -= ret;
memmove(s->tx_fifo, s->tx_fifo + ret, s->tx_count);
}
if (s->tx_count) {
int r = qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP,