From a86cd017a40a66b1a3db005bfee4e76a1ae9a432 Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Mon, 13 Sep 2021 11:04:42 +0300 Subject: [PATCH] RDMA/usnic: Lock VF with mutex instead of spinlock MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Usnic VF doesn't need lock in atomic context to create QPs, so it is safe to use mutex instead of spinlock. Such change fixes the following smatch error. Smatch static checker warning: lib/kobject.c:289 kobject_set_name_vargs() warn: sleeping in atomic context Fixes: 514aee660df4 ("RDMA: Globally allocate and release QP memory") Link: https://lore.kernel.org/r/2a0e295786c127e518ebee8bb7cafcb819a625f6.1631520231.git.leonro@nvidia.com Reported-by: Dan Carpenter Signed-off-by: Leon Romanovsky Reviewed-by: HÃ¥kon Bugge Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/usnic/usnic_ib.h | 2 +- drivers/infiniband/hw/usnic/usnic_ib_main.c | 2 +- drivers/infiniband/hw/usnic/usnic_ib_verbs.c | 16 ++++++++-------- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/infiniband/hw/usnic/usnic_ib.h b/drivers/infiniband/hw/usnic/usnic_ib.h index 84dd682d23341..b350081aeb5a3 100644 --- a/drivers/infiniband/hw/usnic/usnic_ib.h +++ b/drivers/infiniband/hw/usnic/usnic_ib.h @@ -90,7 +90,7 @@ struct usnic_ib_dev { struct usnic_ib_vf { struct usnic_ib_dev *pf; - spinlock_t lock; + struct mutex lock; struct usnic_vnic *vnic; unsigned int qp_grp_ref_cnt; struct usnic_ib_pd *pd; diff --git a/drivers/infiniband/hw/usnic/usnic_ib_main.c b/drivers/infiniband/hw/usnic/usnic_ib_main.c index 228e9a36dad0d..d346dd48e731b 100644 --- a/drivers/infiniband/hw/usnic/usnic_ib_main.c +++ b/drivers/infiniband/hw/usnic/usnic_ib_main.c @@ -572,7 +572,7 @@ static int usnic_ib_pci_probe(struct pci_dev *pdev, } vf->pf = pf; - spin_lock_init(&vf->lock); + mutex_init(&vf->lock); mutex_lock(&pf->usdev_lock); list_add_tail(&vf->link, &pf->vf_dev_list); /* diff --git a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c index 06a4e9d4545da..756a83bcff58a 100644 --- a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c +++ b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c @@ -196,7 +196,7 @@ find_free_vf_and_create_qp_grp(struct ib_qp *qp, for (i = 0; dev_list[i]; i++) { dev = dev_list[i]; vf = dev_get_drvdata(dev); - spin_lock(&vf->lock); + mutex_lock(&vf->lock); vnic = vf->vnic; if (!usnic_vnic_check_room(vnic, res_spec)) { usnic_dbg("Found used vnic %s from %s\n", @@ -208,10 +208,10 @@ find_free_vf_and_create_qp_grp(struct ib_qp *qp, vf, pd, res_spec, trans_spec); - spin_unlock(&vf->lock); + mutex_unlock(&vf->lock); goto qp_grp_check; } - spin_unlock(&vf->lock); + mutex_unlock(&vf->lock); } usnic_uiom_free_dev_list(dev_list); @@ -220,7 +220,7 @@ find_free_vf_and_create_qp_grp(struct ib_qp *qp, /* Try to find resources on an unused vf */ list_for_each_entry(vf, &us_ibdev->vf_dev_list, link) { - spin_lock(&vf->lock); + mutex_lock(&vf->lock); vnic = vf->vnic; if (vf->qp_grp_ref_cnt == 0 && usnic_vnic_check_room(vnic, res_spec) == 0) { @@ -228,10 +228,10 @@ find_free_vf_and_create_qp_grp(struct ib_qp *qp, vf, pd, res_spec, trans_spec); - spin_unlock(&vf->lock); + mutex_unlock(&vf->lock); goto qp_grp_check; } - spin_unlock(&vf->lock); + mutex_unlock(&vf->lock); } usnic_info("No free qp grp found on %s\n", @@ -253,9 +253,9 @@ static void qp_grp_destroy(struct usnic_ib_qp_grp *qp_grp) WARN_ON(qp_grp->state != IB_QPS_RESET); - spin_lock(&vf->lock); + mutex_lock(&vf->lock); usnic_ib_qp_grp_destroy(qp_grp); - spin_unlock(&vf->lock); + mutex_unlock(&vf->lock); } static int create_qp_validate_user_data(struct usnic_ib_create_qp_cmd cmd) -- 2.30.2