diff options
| author | Iris Johnson <iris@modwiz.com> | 2021-01-30 18:40:17 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2021-02-02 17:00:54 +0000 |
| commit | f2c0fb93a44972a96f93510311c93ff4c2c6fab5 (patch) | |
| tree | 5f935e7f6a0ea80500ab9c0671686a25da9db9ff /hw/char/exynos4210_uart.c | |
| parent | 40b4c2ae90e4f864a1015ff748a4af00518ff0c0 (diff) | |
hw/char/exynos4210_uart: Fix missing call to report ready for input
When the frontend device has no space for a read the fd is removed
from polling to allow time for the guest to read and clear the buffer.
Without the call to qemu_chr_fe_accept_input(), the poll will not be
broken out of when the guest has cleared the buffer causing significant
IO delays that get worse with smaller buffers.
Buglink: https://bugs.launchpad.net/qemu/+bug/1913341
Signed-off-by: Iris Johnson <iris@modwiz.com>
Message-id: 20210130184016.1787097-1-iris@modwiz.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/char/exynos4210_uart.c')
| -rw-r--r-- | hw/char/exynos4210_uart.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/char/exynos4210_uart.c b/hw/char/exynos4210_uart.c index 9b21d201b3..80d401a379 100644 --- a/hw/char/exynos4210_uart.c +++ b/hw/char/exynos4210_uart.c @@ -519,6 +519,7 @@ static uint64_t exynos4210_uart_read(void *opaque, hwaddr offset, s->reg[I_(UTRSTAT)] &= ~UTRSTAT_Rx_BUFFER_DATA_READY; res = s->reg[I_(URXH)]; } + qemu_chr_fe_accept_input(&s->chr); exynos4210_uart_update_dmabusy(s); trace_exynos_uart_read(s->channel, offset, exynos4210_uart_regname(offset), res); |