From eee0f03a547f50ca81a8d01ee9f1c84fecd1f64c Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Wed, 15 Jan 2014 13:30:53 +0100 Subject: [PATCH] [SCSI] hpsa: fixup MSI-X registration Commit 254f796b9f22b1944c64caabc356a56caaa2facd updated the driver to use 16 MSI-X vectors, despite the fact that older controllers would provide only 4. This was causing MSI-X registration to drop down to INTx mode. But as the controller support performant mode, the initialisation will become confused and cause the machine to stall during boot. This patch fixes up the MSI-X registration to re-issue the pci_enable_msix() call with the correct number of MSI-X vectors. With that the hpsa driver continues to works on older controllers like the P200. Signed-off-by: Hannes Reinecke Acked-by: Stephen M. Cameron Signed-off-by: James Bottomley --- drivers/scsi/hpsa.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 868318a..40989ee 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -598,7 +598,7 @@ static void set_performant_mode(struct ctlr_info *h, struct CommandList *c) { if (likely(h->transMethod & CFGTBL_Trans_Performant)) { c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1); - if (likely(h->msix_vector)) + if (likely(h->msix_vector > 0)) c->Header.ReplyQueue = raw_smp_processor_id() % h->nreply_queues; } @@ -4169,21 +4169,24 @@ static void hpsa_interrupt_mode(struct ctlr_info *h) goto default_int_mode; if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) { dev_info(&h->pdev->dev, "MSIX\n"); + h->msix_vector = MAX_REPLY_QUEUES; err = pci_enable_msix(h->pdev, hpsa_msix_entries, - MAX_REPLY_QUEUES); - if (!err) { - for (i = 0; i < MAX_REPLY_QUEUES; i++) - h->intr[i] = hpsa_msix_entries[i].vector; - h->msix_vector = 1; - return; - } + h->msix_vector); if (err > 0) { dev_warn(&h->pdev->dev, "only %d MSI-X vectors " "available\n", err); - goto default_int_mode; + h->msix_vector = err; + err = pci_enable_msix(h->pdev, hpsa_msix_entries, + h->msix_vector); + } + if (!err) { + for (i = 0; i < h->msix_vector; i++) + h->intr[i] = hpsa_msix_entries[i].vector; + return; } else { dev_warn(&h->pdev->dev, "MSI-X init failed %d\n", err); + h->msix_vector = 0; goto default_int_mode; } } @@ -4597,15 +4600,15 @@ static int hpsa_request_irq(struct ctlr_info *h, for (i = 0; i < MAX_REPLY_QUEUES; i++) h->q[i] = (u8) i; - if (h->intr_mode == PERF_MODE_INT && h->msix_vector) { + if (h->intr_mode == PERF_MODE_INT && h->msix_vector > 0) { /* If performant mode and MSI-X, use multiple reply queues */ - for (i = 0; i < MAX_REPLY_QUEUES; i++) + for (i = 0; i < h->msix_vector; i++) rc = request_irq(h->intr[i], msixhandler, 0, h->devname, &h->q[i]); } else { /* Use single reply pool */ - if (h->msix_vector || h->msi_vector) { + if (h->msix_vector > 0 || h->msi_vector) { rc = request_irq(h->intr[h->intr_mode], msixhandler, 0, h->devname, &h->q[h->intr_mode]); @@ -4658,7 +4661,7 @@ static void free_irqs(struct ctlr_info *h) return; } - for (i = 0; i < MAX_REPLY_QUEUES; i++) + for (i = 0; i < h->msix_vector; i++) free_irq(h->intr[i], &h->q[i]); } @@ -5178,7 +5181,7 @@ static void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h) if (!(trans_support & PERFORMANT_MODE)) return; - h->nreply_queues = h->msix_vector ? MAX_REPLY_QUEUES : 1; + h->nreply_queues = h->msix_vector > 0 ? h->msix_vector : 1; hpsa_get_max_perf_mode_cmds(h); /* Performant mode ring buffer and supporting data structures */ h->reply_pool_size = h->max_commands * sizeof(u64) * h->nreply_queues; -- 2.7.4