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76 lines
3.6 KiB
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From: "Bounine, Alexandre" <Alexandre.Bounine@idt.com>
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Subject: RE: [PATCH v2 5/7] powerpc/85xx: Add MChk handler for SRIO port
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Date: Thu, 5 Aug 2010 11:17:58 -0700
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Message-ID: <0CE8B6BE3C4AD74AB97D9D29BD24E55201193609@CORPEXCH1.na.ads.idt.com>
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References: <20100308191005.GE4324@amak.tundra.com> <AANLkTine3pc2Ai2Woj81Y9fS_KgGs1sIMb2NMR6G74ww@mail.gmail.com> <AANLkTinKbimKyLpvFD7KOvavshu_n8gRcp2BvEJj0XZQ@mail.gmail.com> <4381.1280815590@neuling.org> <0CE8B6BE3C4AD74AB97D9D29BD24E5520114309D@CORPEXCH1.na.ads.idt.com> <AANLkTinpwYnyc1oN1VbtBgUF6bk6E5q_Gq1Dj3WXV3wc@mail.gmail.com> <0CE8B6BE3C4AD74AB97D9D29BD24E552011430BC@CORPEXCH1.na.ads.idt.com> <26581.1280979260@neuling.org> <0CE8B6BE3C4AD74AB97D9D29BD24E552011935BD@CORPEXCH1.na.ads.idt.com> <C9528078-D64C-4944-B960-0E985B3EE0BA@kernel.crashing.org>
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Cc: "Michael Neuling" <mikey@neuling.org>,
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"Timur Tabi" <timur@freescale.com>,
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"Alexandre Bounine" <abounine@tundra.com>,
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<linuxppc-dev@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
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<thomas.moll@sysgo.com>, "Li Yang-R58472" <r58472@freescale.com>
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To: "Kumar Gala" <galak@kernel.crashing.org>
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Thread-Topic: [PATCH v2 5/7] powerpc/85xx: Add MChk handler for SRIO port
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1019404>
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> I'm looking at this now and wondering what we added the mcheck handler
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for in the first place and what
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> its trying to accomplish.
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>
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> - k
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This protects system from hanging if RIO link fails or enters error
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state. In some situations following maintenance read may initiate link
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recovery from error state.
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As it is now, MCheck mostly prevents system from hanging, but it also
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adds sense to return status of maintenance read routine. I am using
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return status in my new set of patches to check if RIO link is valid
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during error recovery.
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Alex.
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