linux-kernel - RE: [PATCH v2 RESEND 02/23] bfa: Do not call pci_enable

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Date:	Wed, 16 Apr 2014 09:03:47 +0000
From:	Anil Gurumurthy <Anil.Gurumurthy@...gic.com>
To:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-pci <linux-pci@...r.kernel.org>
Subject: RE: [PATCH v2 RESEND 02/23] bfa: Do not call pci_enable_msix()
 after it failed once

Patch look good.
Acked-by: Anil Gurumurthy <anil.gurumurthy@...gic.com>

-----Original Message-----
From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-owner@...r.kernel.org] On Behalf Of Alexander Gordeev
Sent: 14 April 2014 13:35
To: linux-kernel
Cc: Alexander Gordeev; Anil Gurumurthy; Vijaya Mohan Guvva; linux-scsi; linux-pci
Subject: [PATCH v2 RESEND 02/23] bfa: Do not call pci_enable_msix() after it failed once

Function pci_enable_msix() should not be called in case it threw a negative errno from a previous call.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
Cc: Anil Gurumurthy <agurumur@...cade.com>
Cc: Vijaya Mohan Guvva <vmohan@...cade.com>
Cc: linux-scsi@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Acked-by: Anil Gurumurthy <anil.gurumurthy@...gic.com>
---
 drivers/scsi/bfa/bfad.c |   48 ++++++++++++++++++++++------------------------
 1 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c index cc0fbcd..972ff8d 100644
--- a/drivers/scsi/bfa/bfad.c
+++ b/drivers/scsi/bfa/bfad.c
@@ -1235,33 +1235,31 @@ bfad_setup_intr(struct bfad_s *bfad)
           (bfa_asic_id_cb(pdev->device) && !msix_disable_cb)) {

                error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
-               if (error) {
-                       /* In CT1 & CT2, try to allocate just one vector */
-                       if (bfa_asic_id_ctc(pdev->device)) {
-                               printk(KERN_WARNING "bfa %s: trying one msix "
-                                      "vector failed to allocate %d[%d]\n",
-                                      bfad->pci_name, bfad->nvec, error);
-                               bfad->nvec = 1;
-                               error = pci_enable_msix(bfad->pcidev,
+               /* In CT1 & CT2, try to allocate just one vector */
+               if (error > 0 && bfa_asic_id_ctc(pdev->device)) {
+                       printk(KERN_WARNING "bfa %s: trying one msix "
+                              "vector failed to allocate %d[%d]\n",
+                              bfad->pci_name, bfad->nvec, error);
+                       bfad->nvec = 1;
+                       error = pci_enable_msix(bfad->pcidev,
                                                msix_entries, bfad->nvec);
-                       }
+               }

-                       /*
-                        * Only error number of vector is available.
-                        * We don't have a mechanism to map multiple
-                        * interrupts into one vector, so even if we
-                        * can try to request less vectors, we don't
-                        * know how to associate interrupt events to
-                        *  vectors. Linux doesn't duplicate vectors
-                        * in the MSIX table for this case.
-                        */
-                       if (error) {
-                               printk(KERN_WARNING "bfad%d: "
-                                      "pci_enable_msix failed (%d), "
-                                      "use line based.\n",
-                                       bfad->inst_no, error);
-                               goto line_based;
-                       }
+               /*
+                * Only error number of vector is available.
+                * We don't have a mechanism to map multiple
+                * interrupts into one vector, so even if we
+                * can try to request less vectors, we don't
+                * know how to associate interrupt events to
+                *  vectors. Linux doesn't duplicate vectors
+                * in the MSIX table for this case.
+                */
+               if (error) {
+                       printk(KERN_WARNING "bfad%d: "
+                              "pci_enable_msix failed (%d), "
+                              "use line based.\n",
+                               bfad->inst_no, error);
+                       goto line_based;
                }

                /* Disable INTX in MSI-X mode */
--
1.7.7.6

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