From b43b064498702f0429e090f543a677f5c37c5857 Mon Sep 17 00:00:00 2001 From: Selvin Xavier Date: Thu, 18 May 2023 23:48:11 -0700 Subject: RDMA/bnxt_re: Disable/kill tasklet only if it is enabled [ Upstream commit ab112ee7899d6171da5acd77a7ed7ae103f488de ] When the ulp hook to start the IRQ fails because the rings are not available, tasklets are not enabled. In this case when the driver is unloaded, driver calls CREQ tasklet_kill. This causes an indefinite hang as the tasklet is not enabled. Driver shouldn't call tasklet_kill if it is not enabled. So using the creq->requested and nq->requested flags to identify if both tasklets/irqs are registered. Checking this flag while scheduling the tasklet from ISR. Also, added a cleanup for disabling tasklet, in case request_irq fails during start_irq. Check for return value for bnxt_qplib_rcfw_start_irq and in case the bnxt_qplib_rcfw_start_irq fails, return bnxt_re_start_irq without attempting to start NQ IRQs. Fixes: 1ac5a4047975 ("RDMA/bnxt_re: Add bnxt_re RoCE driver") Link: https://lore.kernel.org/r/1684478897-12247-2-git-send-email-selvin.xavier@broadcom.com Signed-off-by: Kalesh AP Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/bnxt_re/main.c | 12 +++++++++--- drivers/infiniband/hw/bnxt_re/qplib_fp.c | 16 ++++++++++------ drivers/infiniband/hw/bnxt_re/qplib_rcfw.c | 14 +++++++++----- 3 files changed, 28 insertions(+), 14 deletions(-) diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c index 8c0c80a8d338..1589b1105f2e 100644 --- a/drivers/infiniband/hw/bnxt_re/main.c +++ b/drivers/infiniband/hw/bnxt_re/main.c @@ -333,15 +333,21 @@ static void bnxt_re_start_irq(void *handle, struct bnxt_msix_entry *ent) for (indx = 0; indx < rdev->num_msix; indx++) rdev->msix_entries[indx].vector = ent[indx].vector; - bnxt_qplib_rcfw_start_irq(rcfw, msix_ent[BNXT_RE_AEQ_IDX].vector, - false); + rc = bnxt_qplib_rcfw_start_irq(rcfw, msix_ent[BNXT_RE_AEQ_IDX].vector, + false); + if (rc) { + ibdev_warn(&rdev->ibdev, "Failed to reinit CREQ\n"); + return; + } for (indx = BNXT_RE_NQ_IDX ; indx < rdev->num_msix; indx++) { nq = &rdev->nq[indx - 1]; rc = bnxt_qplib_nq_start_irq(nq, indx - 1, msix_ent[indx].vector, false); - if (rc) + if (rc) { ibdev_warn(&rdev->ibdev, "Failed to reinit NQ index %d\n", indx - 1); + return; + } } } diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c index ab2cc1c67f70..a143bd3580a2 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c @@ -405,6 +405,9 @@ static irqreturn_t bnxt_qplib_nq_irq(int irq, void *dev_instance) void bnxt_qplib_nq_stop_irq(struct bnxt_qplib_nq *nq, bool kill) { + if (!nq->requested) + return; + tasklet_disable(&nq->nq_tasklet); /* Mask h/w interrupt */ bnxt_qplib_ring_nq_db(&nq->nq_db.dbinfo, nq->res->cctx, false); @@ -412,11 +415,10 @@ void bnxt_qplib_nq_stop_irq(struct bnxt_qplib_nq *nq, bool kill) synchronize_irq(nq->msix_vec); if (kill) tasklet_kill(&nq->nq_tasklet); - if (nq->requested) { - irq_set_affinity_hint(nq->msix_vec, NULL); - free_irq(nq->msix_vec, nq); - nq->requested = false; - } + + irq_set_affinity_hint(nq->msix_vec, NULL); + free_irq(nq->msix_vec, nq); + nq->requested = false; } void bnxt_qplib_disable_nq(struct bnxt_qplib_nq *nq) @@ -455,8 +457,10 @@ int bnxt_qplib_nq_start_irq(struct bnxt_qplib_nq *nq, int nq_indx, snprintf(nq->name, sizeof(nq->name), "bnxt_qplib_nq-%d", nq_indx); rc = request_irq(nq->msix_vec, bnxt_qplib_nq_irq, 0, nq->name, nq); - if (rc) + if (rc) { + tasklet_disable(&nq->nq_tasklet); return rc; + } cpumask_clear(&nq->mask); cpumask_set_cpu(nq_indx, &nq->mask); diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c index 061b2895dd9b..e28f0eb5b55d 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c @@ -635,6 +635,10 @@ void bnxt_qplib_rcfw_stop_irq(struct bnxt_qplib_rcfw *rcfw, bool kill) struct bnxt_qplib_creq_ctx *creq; creq = &rcfw->creq; + + if (!creq->requested) + return; + tasklet_disable(&creq->creq_tasklet); /* Mask h/w interrupts */ bnxt_qplib_ring_nq_db(&creq->creq_db.dbinfo, rcfw->res->cctx, false); @@ -643,10 +647,8 @@ void bnxt_qplib_rcfw_stop_irq(struct bnxt_qplib_rcfw *rcfw, bool kill) if (kill) tasklet_kill(&creq->creq_tasklet); - if (creq->requested) { - free_irq(creq->msix_vec, rcfw); - creq->requested = false; - } + free_irq(creq->msix_vec, rcfw); + creq->requested = false; } void bnxt_qplib_disable_rcfw_channel(struct bnxt_qplib_rcfw *rcfw) @@ -692,8 +694,10 @@ int bnxt_qplib_rcfw_start_irq(struct bnxt_qplib_rcfw *rcfw, int msix_vector, tasklet_enable(&creq->creq_tasklet); rc = request_irq(creq->msix_vec, bnxt_qplib_creq_irq, 0, "bnxt_qplib_creq", rcfw); - if (rc) + if (rc) { + tasklet_disable(&creq->creq_tasklet); return rc; + } creq->requested = true; bnxt_qplib_ring_nq_db(&creq->creq_db.dbinfo, rcfw->res->cctx, true); -- cgit v1.2.3