* uart ops tx_empty lock
@ 2011-02-12 13:16 Richard Zhao
2011-02-12 16:11 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Richard Zhao @ 2011-02-12 13:16 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: linux-serial
Hi Greg,
Does uart_ops.tx_empty need to hold port->lock?
I find some drivers hold the lock in tx_empty hook, for example 8250.
But many more drivers don't hold it, for example imx.c, sh-sci.c.
Thanks
Richard
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: uart ops tx_empty lock
2011-02-12 13:16 uart ops tx_empty lock Richard Zhao
@ 2011-02-12 16:11 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2011-02-12 16:11 UTC (permalink / raw)
To: Richard Zhao; +Cc: linux-serial
On Sat, Feb 12, 2011 at 09:16:45PM +0800, Richard Zhao wrote:
> Hi Greg,
>
> Does uart_ops.tx_empty need to hold port->lock?
> I find some drivers hold the lock in tx_empty hook, for example 8250.
> But many more drivers don't hold it, for example imx.c, sh-sci.c.
I do not know, Alan would know best about this.
Alan?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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