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xen-devel
Re: [Xen-devel] Re: [PATCH] IRQ handling race and spurious IIR read in s
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To: |
Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [PATCH] IRQ handling race and spurious IIR read in serial/8250.c |
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From: |
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
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Date: |
Thu, 12 Mar 2009 21:38:31 +0000 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Markus Armbruster <armbru@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Anders Kaseorg <andersk@xxxxxxx>, "linux-serial@xxxxxxxxxxxxxxx" <linux-serial@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> |
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Thu, 12 Mar 2009 14:39:11 -0700 |
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> 1. It is definitely correct and does not introduce any new bugs.
Right ;)
> 2. It makes the existing bug definitely go away. That is, after my
> patch is applied the code drives the UART correctly - that is,
> according to the specification and in a manner guaranteed to be
The UART hardware and specifications diverge - often quite spectacularly.
> 4. Any fix which does not involve completely removing UART_BUG_TXEN
> will need my change.
Or the locking fix
It was described as a band aid so I treated it as such. Regardless of the
right thing to do long term its not a 2.6.29 candidate at this point but
certainly something that wants looking into in 2.6.30
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