linux-kernel - RE: [PATCH] megaraid_sas : Fix bug in handling return value of pci_enable_msix

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Message-ID: <f16ae17914f6e3023f59d4e3b1f6d188@mail.gmail.com>
Date:	Tue, 4 Nov 2014 16:06:06 +0530
From:	Sumit Saxena <sumit.saxena@...gotech.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Neela Syam Kolli <megaraidlinux@....com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>
Cc:	Alexander Gordeev <agordeev@...hat.com>, linux-pci@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH] megaraid_sas : Fix bug in handling return value of pci_enable_msix_range()

>-----Original Message-----
>From: Jiang Liu [mailto:jiang.liu@...ux.intel.com]
>Sent: Monday, November 03, 2014 6:14 PM
>To: Neela Syam Kolli; James E.J. Bottomley
>Cc: Jiang Liu; Alexander Gordeev; linux-pci@...r.kernel.org; linux-
>scsi@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: [PATCH] megaraid_sas : Fix bug in handling return value of
>pci_enable_msix_range()
>
>Function pci_enable_msix_range() may return negative values for error
>conditions. So it's a bug by checking (pci_enable_msix_range() != 0) for
>success and causes failure to megaraid driver when MSI is disabled.
>[   16.487267] megaraid_sas 0000:02:00.0: Controller type: iMR
>[   16.487275] genirq: Flags mismatch irq 0. 00000000 (megasas) vs.
00015a00 (tii
>mer)
>[   16.487347] megasas: Failed to register IRQ for vector 0.
>
>Fixes: 8ae80ed1734b "megaraid: Use pci_enable_msix_range() instead of
>pci_enable_msix()"
>
>Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>Cc: Alexander Gordeev <agordeev@...hat.com>
>Cc: "Bjorn Helgaas <bhelgaas@...gle.com>"
>Cc: linux-pci@...r.kernel.org
>Cc: <stable@...r.kernel.org> # 3.17
>---
> drivers/scsi/megaraid/megaraid_sas_base.c |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c
>b/drivers/scsi/megaraid/megaraid_sas_base.c
>index f6a69a3b1b3f..5640ad1c8214 100644
>--- a/drivers/scsi/megaraid/megaraid_sas_base.c
>+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
>@@ -4453,7 +4453,7 @@ static int megasas_init_fw(struct megasas_instance
>*instance)
> 			instance->msixentry[i].entry = i;
> 		i = pci_enable_msix_range(instance->pdev, instance-
>>msixentry,
> 					  1, instance->msix_vectors);
>-		if (i)
>+		if (i > 0)
> 			instance->msix_vectors = i;
> 		else
> 			instance->msix_vectors = 0;

Acked-by: Sumit Saxena <sumit.saxena@...gotech.com>

>--
>1.7.10.4
--
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