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kvm tools, 8250: Don't set the UART_LSR_OE bit

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User input is buffered anyway, so it's pointless to set the UART_LSR_OE bit.
Instead, wait for the guest kernel to consume the current input and send a new
character when the guest is ready.

This fixes the following warnings in guest kernels:

[  207.485000] ttyS0: 1 input overrun(s)

Reported-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:41 +01:00
committed by Will Deacon
parent 8315b1925c
commit db34045c54
1 changed files with 3 additions and 3 deletions
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8250-serial.c
+3 -3
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@@ -77,6 +77,9 @@ static void serial8250__receive(struct kvm *self, struct serial8250_device *dev)
{
int c;
if (dev->lsr & UART_LSR_DR)
return;
if (!is_readable(fileno(stdin)))
return;
@@ -84,9 +87,6 @@ static void serial8250__receive(struct kvm *self, struct serial8250_device *dev)
if (c < 0)
return;
if (dev->lsr & UART_LSR_DR)
dev->lsr |= UART_LSR_OE;
dev->rbr = c;
dev->lsr |= UART_LSR_DR;
}