linux-kernel - Re: [PATCH] scsi/ipr: Fix runaway IRQs when falling back from MSI to LSI

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Date:   Tue, 29 Nov 2016 11:58:38 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Brian King <brking@...ux.vnet.ibm.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-scsi@...r.kernel.org,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        linuxppc dev list <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] scsi/ipr: Fix runaway IRQs when falling back from MSI to LSI

>>>>> "Benjamin" == Benjamin Herrenschmidt <benh@...nel.crashing.org> writes:

Benjamin> LSIs must be ack'ed with an MMIO otherwise they remain
Benjamin> asserted forever. This is controlled by the "clear_isr" flag.

Benjamin> While we set that flag properly when deciding initially
Benjamin> whether to use LSIs or MSIs, we fail to set it if we first
Benjamin> chose MSIs, the test fails, then fallback to LSIs.

Brian: Please review!

-- 
Martin K. Petersen	Oracle Linux Engineering