From 1ccf6aa19aabc11587d6d7818a5729adfed0e3de Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Fri, 22 Sep 2006 15:17:20 -0700 Subject: [PATCH] IB/uverbs: Fix lockdep warning when QP is created with 2 CQs Lockdep warns when userspace creates a QP that uses different CQs for send completions and receive completions, because both CQs are locked and their mutexes belong to the same lock class. However, we know that the mutexes are distinct and the nesting is safe (there is no possibility of AB-BA deadlock because the mutexes are locked with down_read()), so annotate the situation with SINGLE_DEPTH_NESTING to get rid of the lockdep warning. Signed-off-by: Roland Dreier --- drivers/infiniband/core/uverbs_cmd.c | 34 ++++++++++++++++------------ 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index b81307b625..8b6df7cec0 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -155,7 +155,7 @@ static struct ib_uobject *__idr_get_uobj(struct idr *idr, int id, } static struct ib_uobject *idr_read_uobj(struct idr *idr, int id, - struct ib_ucontext *context) + struct ib_ucontext *context, int nested) { struct ib_uobject *uobj; @@ -163,7 +163,10 @@ static struct ib_uobject *idr_read_uobj(struct idr *idr, int id, if (!uobj) return NULL; - down_read(&uobj->mutex); + if (nested) + down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING); + else + down_read(&uobj->mutex); if (!uobj->live) { put_uobj_read(uobj); return NULL; @@ -190,17 +193,18 @@ static struct ib_uobject *idr_write_uobj(struct idr *idr, int id, return uobj; } -static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context) +static void *idr_read_obj(struct idr *idr, int id, struct ib_ucontext *context, + int nested) { struct ib_uobject *uobj; - uobj = idr_read_uobj(idr, id, context); + uobj = idr_read_uobj(idr, id, context, nested); return uobj ? uobj->object : NULL; } static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context) { - return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context); + return idr_read_obj(&ib_uverbs_pd_idr, pd_handle, context, 0); } static void put_pd_read(struct ib_pd *pd) @@ -208,9 +212,9 @@ static void put_pd_read(struct ib_pd *pd) put_uobj_read(pd->uobject); } -static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context) +static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested) { - return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context); + return idr_read_obj(&ib_uverbs_cq_idr, cq_handle, context, nested); } static void put_cq_read(struct ib_cq *cq) @@ -220,7 +224,7 @@ static void put_cq_read(struct ib_cq *cq) static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context) { - return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context); + return idr_read_obj(&ib_uverbs_ah_idr, ah_handle, context, 0); } static void put_ah_read(struct ib_ah *ah) @@ -230,7 +234,7 @@ static void put_ah_read(struct ib_ah *ah) static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context) { - return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context); + return idr_read_obj(&ib_uverbs_qp_idr, qp_handle, context, 0); } static void put_qp_read(struct ib_qp *qp) @@ -240,7 +244,7 @@ static void put_qp_read(struct ib_qp *qp) static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context) { - return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context); + return idr_read_obj(&ib_uverbs_srq_idr, srq_handle, context, 0); } static void put_srq_read(struct ib_srq *srq) @@ -867,7 +871,7 @@ ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file, (unsigned long) cmd.response + sizeof resp, in_len - sizeof cmd, out_len - sizeof resp); - cq = idr_read_cq(cmd.cq_handle, file->ucontext); + cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0); if (!cq) return -EINVAL; @@ -914,7 +918,7 @@ ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file, goto out_wc; } - cq = idr_read_cq(cmd.cq_handle, file->ucontext); + cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0); if (!cq) { ret = -EINVAL; goto out; @@ -962,7 +966,7 @@ ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file, if (copy_from_user(&cmd, buf, sizeof cmd)) return -EFAULT; - cq = idr_read_cq(cmd.cq_handle, file->ucontext); + cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0); if (!cq) return -EINVAL; @@ -1060,9 +1064,9 @@ ssize_t ib_uverbs_create_qp(struct ib_uverbs_file *file, srq = cmd.is_srq ? idr_read_srq(cmd.srq_handle, file->ucontext) : NULL; pd = idr_read_pd(cmd.pd_handle, file->ucontext); - scq = idr_read_cq(cmd.send_cq_handle, file->ucontext); + scq = idr_read_cq(cmd.send_cq_handle, file->ucontext, 0); rcq = cmd.recv_cq_handle == cmd.send_cq_handle ? - scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext); + scq : idr_read_cq(cmd.recv_cq_handle, file->ucontext, 1); if (!pd || !scq || !rcq || (cmd.is_srq && !srq)) { ret = -EINVAL; -- 2.39.5