linux-kernel - Re: [PATCH 3/3] 8250: add workaround for MPC8[356]xx UART break IRQ storm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <176AE2A1-6AA2-4F14-942F-8ED77AB1DBEC@kernel.crashing.org>
Date:	Thu, 1 Dec 2011 18:17:56 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Scott Wood <scottwood@...escale.com>, <gregkh@...e.de>,
	<alan@...ux.intel.com>, <linux-serial@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] 8250: add workaround for MPC8[356]xx UART break IRQ storm


On Dec 1, 2011, at 6:05 PM, Paul Gortmaker wrote:

> On 11-12-01 06:51 PM, Scott Wood wrote:
>> On 12/01/2011 05:47 PM, Paul Gortmaker wrote:
>>> diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
>>> index 8c660af..b0f4042 100644
>>> --- a/include/linux/serial_8250.h
>>> +++ b/include/linux/serial_8250.h
>>> @@ -18,6 +18,11 @@
>>> #define UART_BUG_TXEN	(1 << 1)	/* buggy TX IIR status */
>>> #define UART_BUG_NOMSR	(1 << 2)	/* buggy MSR status bits (Au1x00) */
>>> #define UART_BUG_THRE	(1 << 3)	/* buggy THRE reassertion */
>>> +#ifdef CONFIG_PPC32
>>> +#define UART_BUG_FSLBK	(1 << 4)	/* buggy FSL break IRQ storm */
>>> +#else	/* help GCC optimize away IRQ handler errata code for ARCH != PPC32 */
>>> +#define UART_BUG_FSLBK	0
>>> +#endif
>> 
>> I believe this bug still exists on our 64-bit chips.
> 
> OK, I'll simply change the above to CONFIG_PPC then.

It does, the bug is in the uart IP which I don't think we ever plan on fixing, so 32 or 64-bit parts will have it for ever and ever ;)

- k--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/