[PATCH for-next 05/27] IB/hfi1: Protect context array set/clear with spinlock

[Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

From: Michael J. Ruhl <michael.j.ruhl-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

The rcd array can be accessed from user context or during interrupts.
Protecting this with a mutex isn't a good idea because the mutex should
not be used from an IRQ.

Protect the allocation and freeing of rcd array elements with a
spinlock.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Reviewed-by: Sebastian Sanchez <sebastian.sanchez-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 drivers/infiniband/hw/hfi1/chip.c      |   10 +-
 drivers/infiniband/hw/hfi1/file_ops.c  |  171 ++++++++++++---------------
 drivers/infiniband/hw/hfi1/hfi.h       |    8 +
 drivers/infiniband/hw/hfi1/init.c      |  199 ++++++++++++++++++++++----------
 drivers/infiniband/hw/hfi1/vnic_main.c |   22 +---
 5 files changed, 229 insertions(+), 181 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 8c47653..249b56a 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -15054,10 +15054,16 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev,
 	if (ret)
 		goto bail_cleanup;
 
-	ret = hfi1_create_ctxts(dd);
+	ret = hfi1_create_kctxts(dd);
 	if (ret)
 		goto bail_cleanup;
 
+	/*
+	 * Initialize aspm, to be done after gen3 transition and setting up
+	 * contexts and before enabling interrupts
+	 */
+	aspm_init(dd);
+
 	dd->rcvhdrsize = DEFAULT_RCVHDRSIZE;
 	/*
 	 * rcd[0] is guaranteed to be valid by this point. Also, all
@@ -15076,7 +15082,7 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev,
 			goto bail_cleanup;
 	}
 
-	/* use contexts created by hfi1_create_ctxts */
+	/* use contexts created by hfi1_create_kctxts */
 	ret = set_up_interrupts(dd);
 	if (ret)
 		goto bail_cleanup;
diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c
index a0c13fa..7361366 100644
--- a/drivers/infiniband/hw/hfi1/file_ops.c
+++ b/drivers/infiniband/hw/hfi1/file_ops.c
@@ -79,8 +79,8 @@
 
 static u64 kvirt_to_phys(void *addr);
 static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo);
-static int init_subctxts(struct hfi1_ctxtdata *uctxt,
-			 const struct hfi1_user_info *uinfo);
+static void init_subctxts(struct hfi1_ctxtdata *uctxt,
+			  const struct hfi1_user_info *uinfo);
 static int init_user_ctxt(struct hfi1_filedata *fd,
 			  struct hfi1_ctxtdata *uctxt);
 static void user_init(struct hfi1_ctxtdata *uctxt);
@@ -758,7 +758,6 @@ static int hfi1_file_close(struct inode *inode, struct file *fp)
 		goto done;
 
 	hfi1_cdbg(PROC, "freeing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
-	mutex_lock(&hfi1_mutex);
 
 	flush_wc();
 	/* drain user sdma queue */
@@ -778,6 +777,7 @@ static int hfi1_file_close(struct inode *inode, struct file *fp)
 			   HFI1_MAX_SHARED_CTXTS) + fdata->subctxt;
 	*ev = 0;
 
+	mutex_lock(&hfi1_mutex);
 	__clear_bit(fdata->subctxt, uctxt->in_use_ctxts);
 	fdata->uctxt = NULL;
 	hfi1_rcd_put(uctxt); /* fdata reference */
@@ -844,6 +844,38 @@ static u64 kvirt_to_phys(void *addr)
 	return paddr;
 }
 
+static int complete_subctxt(struct hfi1_filedata *fd)
+{
+	int ret;
+
+	/*
+	 * sub-context info can only be set up after the base context
+	 * has been completed.
+	 */
+	ret = wait_event_interruptible(
+		fd->uctxt->wait,
+		!test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags));
+
+	if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
+		ret = -ENOMEM;
+
+	/* The only thing a sub context needs is the user_xxx stuff */
+	if (!ret) {
+		fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id);
+		ret = init_user_ctxt(fd, fd->uctxt);
+	}
+
+	if (ret) {
+		hfi1_rcd_put(fd->uctxt);
+		fd->uctxt = NULL;
+		mutex_lock(&hfi1_mutex);
+		__clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
+		mutex_unlock(&hfi1_mutex);
+	}
+
+	return ret;
+}
+
 static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
 {
 	int ret;
@@ -854,24 +886,25 @@ static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
 	if (swmajor != HFI1_USER_SWMAJOR)
 		return -ENODEV;
 
+	if (uinfo->subctxt_cnt > HFI1_MAX_SHARED_CTXTS)
+		return -EINVAL;
+
 	swminor = uinfo->userversion & 0xffff;
 
+	/*
+	 * Acquire the mutex to protect against multiple creations of what
+	 * could be a shared base context.
+	 */
 	mutex_lock(&hfi1_mutex);
 	/*
-	 * Get a sub context if necessary.
+	 * Get a sub context if available  (fd->uctxt will be set).
 	 * ret < 0 error, 0 no context, 1 sub-context found
 	 */
-	ret = 0;
-	if (uinfo->subctxt_cnt) {
-		ret = find_sub_ctxt(fd, uinfo);
-		if (ret > 0)
-			fd->rec_cpu_num =
-				hfi1_get_proc_affinity(fd->uctxt->numa_id);
-	}
+	ret = find_sub_ctxt(fd, uinfo);
 
 	/*
-	 * Allocate a base context if context sharing is not required or we
-	 * couldn't find a sub context.
+	 * Allocate a base context if context sharing is not required or a
+	 * sub context wasn't found.
 	 */
 	if (!ret)
 		ret = allocate_ctxt(fd, fd->dd, uinfo, &uctxt);
@@ -879,31 +912,10 @@ static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
 	mutex_unlock(&hfi1_mutex);
 
 	/* Depending on the context type, do the appropriate init */
-	if (ret > 0) {
-		/*
-		 * sub-context info can only be set up after the base
-		 * context has been completed.
-		 */
-		ret = wait_event_interruptible(fd->uctxt->wait, !test_bit(
-					       HFI1_CTXT_BASE_UNINIT,
-					       &fd->uctxt->event_flags));
-		if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
-			ret = -ENOMEM;
-
-		/* The only thing a sub context needs is the user_xxx stuff */
-		if (!ret)
-			ret = init_user_ctxt(fd, fd->uctxt);
-
-		if (ret)
-			clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
-
-	} else if (!ret) {
+	switch (ret) {
+	case 0:
 		ret = setup_base_ctxt(fd, uctxt);
 		if (uctxt->subctxt_cnt) {
-			/* If there is an error, set the failed bit. */
-			if (ret)
-				set_bit(HFI1_CTXT_BASE_FAILED,
-					&uctxt->event_flags);
 			/*
 			 * Base context is done, notify anybody using a
 			 * sub-context that is waiting for this completion
@@ -911,14 +923,12 @@ static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
 			clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
 			wake_up(&uctxt->wait);
 		}
-		if (ret)
-			deallocate_ctxt(uctxt);
-	}
-
-	/* If an error occurred, clear the reference */
-	if (ret && fd->uctxt) {
-		hfi1_rcd_put(fd->uctxt);
-		fd->uctxt = NULL;
+		break;
+	case 1:
+		ret = complete_subctxt(fd);
+		break;
+	default:
+		break;
 	}
 
 	return ret;
@@ -926,7 +936,7 @@ static int assign_ctxt(struct hfi1_filedata *fd, struct hfi1_user_info *uinfo)
 
 /*
  * The hfi1_mutex must be held when this function is called.  It is
- * necessary to ensure serialized access to the bitmask in_use_ctxts.
+ * necessary to ensure serialized creation of shared contexts.
  */
 static int find_sub_ctxt(struct hfi1_filedata *fd,
 			 const struct hfi1_user_info *uinfo)
@@ -935,6 +945,9 @@ static int find_sub_ctxt(struct hfi1_filedata *fd,
 	struct hfi1_devdata *dd = fd->dd;
 	u16 subctxt;
 
+	if (!uinfo->subctxt_cnt)
+		return 0;
+
 	for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) {
 		struct hfi1_ctxtdata *uctxt = dd->rcd[i];
 
@@ -983,7 +996,6 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 			 struct hfi1_ctxtdata **cd)
 {
 	struct hfi1_ctxtdata *uctxt;
-	u16 ctxt;
 	int ret, numa;
 
 	if (dd->flags & HFI1_FROZEN) {
@@ -997,22 +1009,9 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 		return -EIO;
 	}
 
-	/*
-	 * This check is sort of redundant to the next EBUSY error. It would
-	 * also indicate an inconsistancy in the driver if this value was
-	 * zero, but there were still contexts available.
-	 */
 	if (!dd->freectxts)
 		return -EBUSY;
 
-	for (ctxt = dd->first_dyn_alloc_ctxt;
-	     ctxt < dd->num_rcv_contexts; ctxt++)
-		if (!dd->rcd[ctxt])
-			break;
-
-	if (ctxt == dd->num_rcv_contexts)
-		return -EBUSY;
-
 	/*
 	 * If we don't have a NUMA node requested, preference is towards
 	 * device NUMA node.
@@ -1022,11 +1021,10 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 		numa = cpu_to_node(fd->rec_cpu_num);
 	else
 		numa = numa_node_id();
-	uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, numa);
-	if (!uctxt) {
-		dd_dev_err(dd,
-			   "Unable to allocate ctxtdata memory, failing open\n");
-		return -ENOMEM;
+	ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
+	if (ret < 0) {
+		dd_dev_err(dd, "user ctxtdata allocation failed\n");
+		return ret;
 	}
 	hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
 		  uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
@@ -1035,8 +1033,7 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 	/*
 	 * Allocate and enable a PIO send context.
 	 */
-	uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize,
-			     uctxt->dd->node);
+	uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, dd->node);
 	if (!uctxt->sc) {
 		ret = -ENOMEM;
 		goto ctxdata_free;
@@ -1048,20 +1045,13 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 		goto ctxdata_free;
 
 	/*
-	 * Setup sub context resources if the user-level has requested
+	 * Setup sub context information if the user-level has requested
 	 * sub contexts.
 	 * This has to be done here so the rest of the sub-contexts find the
-	 * proper master.
+	 * proper base context.
 	 */
-	if (uinfo->subctxt_cnt) {
-		ret = init_subctxts(uctxt, uinfo);
-		/*
-		 * On error, we don't need to disable and de-allocate the
-		 * send context because it will be done during file close
-		 */
-		if (ret)
-			goto ctxdata_free;
-	}
+	if (uinfo->subctxt_cnt)
+		init_subctxts(uctxt, uinfo);
 	uctxt->userversion = uinfo->userversion;
 	uctxt->flags = hfi1_cap_mask; /* save current flag state */
 	init_waitqueue_head(&uctxt->wait);
@@ -1081,9 +1071,7 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 	return 0;
 
 ctxdata_free:
-	*cd = NULL;
-	dd->rcd[ctxt] = NULL;
-	hfi1_rcd_put(uctxt);
+	hfi1_free_ctxt(dd, uctxt);
 	return ret;
 }
 
@@ -1093,28 +1081,17 @@ static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt)
 	hfi1_stats.sps_ctxts--;
 	if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts)
 		aspm_enable_all(uctxt->dd);
-
-	/* _rcd_put() should be done after releasing mutex */
-	uctxt->dd->rcd[uctxt->ctxt] = NULL;
 	mutex_unlock(&hfi1_mutex);
-	hfi1_rcd_put(uctxt);  /* dd reference */
+
+	hfi1_free_ctxt(uctxt->dd, uctxt);
 }
 
-static int init_subctxts(struct hfi1_ctxtdata *uctxt,
-			 const struct hfi1_user_info *uinfo)
+static void init_subctxts(struct hfi1_ctxtdata *uctxt,
+			  const struct hfi1_user_info *uinfo)
 {
-	u16 num_subctxts;
-
-	num_subctxts = uinfo->subctxt_cnt;
-	if (num_subctxts > HFI1_MAX_SHARED_CTXTS)
-		return -EINVAL;
-
 	uctxt->subctxt_cnt = uinfo->subctxt_cnt;
 	uctxt->subctxt_id = uinfo->subctxt_id;
-	uctxt->redirect_seq_cnt = 1;
 	set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
-
-	return 0;
 }
 
 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
@@ -1302,8 +1279,8 @@ static int setup_base_ctxt(struct hfi1_filedata *fd,
 	return 0;
 
 setup_failed:
-	/* Call _free_ctxtdata, not _rcd_put().  We still need the context. */
-	hfi1_free_ctxtdata(dd, uctxt);
+	set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags);
+	deallocate_ctxt(uctxt);
 	return ret;
 }
 
diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h
index 728ed45..bb003ff 100644
--- a/drivers/infiniband/hw/hfi1/hfi.h
+++ b/drivers/infiniband/hw/hfi1/hfi.h
@@ -273,7 +273,6 @@ struct hfi1_ctxtdata {
 	u16 poll_type;
 	/* receive packet sequence counter */
 	u8 seq_cnt;
-	u8 redirect_seq_cnt;
 	/* ctxt rcvhdrq head offset */
 	u32 head;
 	/* QPs waiting for context processing */
@@ -1263,9 +1262,10 @@ struct hfi1_filedata {
 
 int hfi1_create_rcvhdrq(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd);
 int hfi1_setup_eagerbufs(struct hfi1_ctxtdata *rcd);
-int hfi1_create_ctxts(struct hfi1_devdata *dd);
-struct hfi1_ctxtdata *hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, u16 ctxt,
-					   int numa);
+int hfi1_create_kctxts(struct hfi1_devdata *dd);
+int hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, int numa,
+			 struct hfi1_ctxtdata **rcd);
+void hfi1_free_ctxt(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd);
 void hfi1_init_pportdata(struct pci_dev *pdev, struct hfi1_pportdata *ppd,
 			 struct hfi1_devdata *dd, u8 hw_pidx, u8 port);
 void hfi1_free_ctxtdata(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd);
diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c
index da7cd5b..23f0bbc 100644
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -126,71 +126,67 @@
 u32 hfi1_cpulist_count;
 unsigned long *hfi1_cpulist;
 
-/*
- * Common code for creating the receive context array.
- */
-int hfi1_create_ctxts(struct hfi1_devdata *dd)
+static int hfi1_create_kctxt(struct hfi1_devdata *dd,
+			     struct hfi1_pportdata *ppd)
 {
-	u16 i;
+	struct hfi1_ctxtdata *rcd;
 	int ret;
 
 	/* Control context has to be always 0 */
 	BUILD_BUG_ON(HFI1_CTRL_CTXT != 0);
 
+	ret = hfi1_create_ctxtdata(ppd, dd->node, &rcd);
+	if (ret < 0) {
+		dd_dev_err(dd, "Kernel receive context allocation failed\n");
+		return ret;
+	}
+
+	/*
+	 * Set up the kernel context flags here and now because they use
+	 * default values for all receive side memories.  User contexts will
+	 * be handled as they are created.
+	 */
+	rcd->flags = HFI1_CAP_KGET(MULTI_PKT_EGR) |
+		HFI1_CAP_KGET(NODROP_RHQ_FULL) |
+		HFI1_CAP_KGET(NODROP_EGR_FULL) |
+		HFI1_CAP_KGET(DMA_RTAIL);
+
+	/* Control context must use DMA_RTAIL */
+	if (rcd->ctxt == HFI1_CTRL_CTXT)
+		rcd->flags |= HFI1_CAP_DMA_RTAIL;
+	rcd->seq_cnt = 1;
+
+	rcd->sc = sc_alloc(dd, SC_ACK, rcd->rcvhdrqentsize, dd->node);
+	if (!rcd->sc) {
+		dd_dev_err(dd, "Kernel send context allocation failed\n");
+		return -ENOMEM;
+	}
+	hfi1_init_ctxt(rcd->sc);
+
+	return 0;
+}
+
+/*
+ * Create the receive context array and one or more kernel contexts
+ */
+int hfi1_create_kctxts(struct hfi1_devdata *dd)
+{
+	u16 i;
+	int ret;
+
 	dd->rcd = kzalloc_node(dd->num_rcv_contexts * sizeof(*dd->rcd),
 			       GFP_KERNEL, dd->node);
 	if (!dd->rcd)
-		goto nomem;
+		return -ENOMEM;
 
-	/* create one or more kernel contexts */
 	for (i = 0; i < dd->first_dyn_alloc_ctxt; ++i) {
-		struct hfi1_pportdata *ppd;
-		struct hfi1_ctxtdata *rcd;
-
-		ppd = dd->pport + (i % dd->num_pports);
-
-		/* dd->rcd[i] gets assigned inside the callee */
-		rcd = hfi1_create_ctxtdata(ppd, i, dd->node);
-		if (!rcd) {
-			dd_dev_err(dd,
-				   "Unable to allocate kernel receive context, failing\n");
-			goto nomem;
-		}
-		/*
-		 * Set up the kernel context flags here and now because they
-		 * use default values for all receive side memories.  User
-		 * contexts will be handled as they are created.
-		 */
-		rcd->flags = HFI1_CAP_KGET(MULTI_PKT_EGR) |
-			HFI1_CAP_KGET(NODROP_RHQ_FULL) |
-			HFI1_CAP_KGET(NODROP_EGR_FULL) |
-			HFI1_CAP_KGET(DMA_RTAIL);
-
-		/* Control context must use DMA_RTAIL */
-		if (rcd->ctxt == HFI1_CTRL_CTXT)
-			rcd->flags |= HFI1_CAP_DMA_RTAIL;
-		rcd->seq_cnt = 1;
-
-		rcd->sc = sc_alloc(dd, SC_ACK, rcd->rcvhdrqentsize, dd->node);
-		if (!rcd->sc) {
-			dd_dev_err(dd,
-				   "Unable to allocate kernel send context, failing\n");
-			goto nomem;
-		}
-
-		hfi1_init_ctxt(rcd->sc);
+		ret = hfi1_create_kctxt(dd, dd->pport);
+		if (ret)
+			goto bail;
 	}
 
-	/*
-	 * Initialize aspm, to be done after gen3 transition and setting up
-	 * contexts and before enabling interrupts
-	 */
-	aspm_init(dd);
-
 	return 0;
-nomem:
-	ret = -ENOMEM;
-
+bail:
 	for (i = 0; dd->rcd && i < dd->first_dyn_alloc_ctxt; ++i)
 		hfi1_rcd_put(dd->rcd[i]);
 
@@ -208,6 +204,11 @@ static void hfi1_rcd_init(struct hfi1_ctxtdata *rcd)
 	kref_init(&rcd->kref);
 }
 
+/**
+ * hfi1_rcd_free - When reference is zero clean up.
+ * @kref: pointer to an initialized rcd data structure
+ *
+ */
 static void hfi1_rcd_free(struct kref *kref)
 {
 	struct hfi1_ctxtdata *rcd =
@@ -217,6 +218,12 @@ static void hfi1_rcd_free(struct kref *kref)
 	kfree(rcd);
 }
 
+/**
+ * hfi1_rcd_put - decrement reference for rcd
+ * @rcd: pointer to an initialized rcd data structure
+ *
+ * Use this to put a reference after the init.
+ */
 int hfi1_rcd_put(struct hfi1_ctxtdata *rcd)
 {
 	if (rcd)
@@ -225,16 +232,58 @@ int hfi1_rcd_put(struct hfi1_ctxtdata *rcd)
 	return 0;
 }
 
+/**
+ * hfi1_rcd_get - increment reference for rcd
+ * @rcd: pointer to an initialized rcd data structure
+ *
+ * Use this to get a reference after the init.
+ */
 void hfi1_rcd_get(struct hfi1_ctxtdata *rcd)
 {
 	kref_get(&rcd->kref);
 }
 
+/**
+ * allocate_rcd_index - allocate an rcd index from the rcd array
+ * @dd: pointer to a valid devdata structure
+ * @rcd: rcd data structure to assign
+ * @index: pointer to index that is allocated
+ *
+ * Find an empty index in the rcd array, and assign the given rcd to it.
+ * If the array is full, we are EBUSY.
+ *
+ */
+static u16 allocate_rcd_index(struct hfi1_devdata *dd,
+			      struct hfi1_ctxtdata *rcd, u16 *index)
+{
+	unsigned long flags;
+	u16 ctxt;
+
+	spin_lock_irqsave(&dd->uctxt_lock, flags);
+	for (ctxt = 0; ctxt < dd->num_rcv_contexts; ctxt++)
+		if (!dd->rcd[ctxt])
+			break;
+
+	if (ctxt < dd->num_rcv_contexts) {
+		rcd->ctxt = ctxt;
+		dd->rcd[ctxt] = rcd;
+		hfi1_rcd_init(rcd);
+	}
+	spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+
+	if (ctxt >= dd->num_rcv_contexts)
+		return -EBUSY;
+
+	*index = ctxt;
+
+	return 0;
+}
+
 /*
  * Common code for user and kernel context setup.
  */
-struct hfi1_ctxtdata *hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, u16 ctxt,
-					   int numa)
+int hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, int numa,
+			 struct hfi1_ctxtdata **context)
 {
 	struct hfi1_devdata *dd = ppd->dd;
 	struct hfi1_ctxtdata *rcd;
@@ -248,9 +297,18 @@ struct hfi1_ctxtdata *hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, u16 ctxt,
 	rcd = kzalloc_node(sizeof(*rcd), GFP_KERNEL, numa);
 	if (rcd) {
 		u32 rcvtids, max_entries;
+		u16 ctxt;
+		int ret;
 
 		hfi1_cdbg(PROC, "setting up context %u\n", ctxt);
 
+		ret = allocate_rcd_index(dd, rcd, &ctxt);
+		if (ret) {
+			*context = NULL;
+			kfree(rcd);
+			return ret;
+		}
+
 		INIT_LIST_HEAD(&rcd->qp_wait_list);
 		hfi1_exp_tid_group_init(&rcd->tid_group_list);
 		hfi1_exp_tid_group_init(&rcd->tid_used_list);
@@ -258,8 +316,6 @@ struct hfi1_ctxtdata *hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, u16 ctxt,
 		rcd->ppd = ppd;
 		rcd->dd = dd;
 		__set_bit(0, rcd->in_use_ctxts);
-		rcd->ctxt = ctxt;
-		dd->rcd[ctxt] = rcd;
 		rcd->numa_id = numa;
 		rcd->rcv_array_groups = dd->rcv_entries.ngroups;
 
@@ -363,15 +419,34 @@ struct hfi1_ctxtdata *hfi1_create_ctxtdata(struct hfi1_pportdata *ppd, u16 ctxt,
 				goto bail;
 		}
 
-		hfi1_rcd_init(rcd);
+		*context = rcd;
+		return 0;
 	}
-	return rcd;
+
 bail:
-	dd->rcd[ctxt] = NULL;
-	kfree(rcd->egrbufs.rcvtids);
-	kfree(rcd->egrbufs.buffers);
-	kfree(rcd);
-	return NULL;
+	*context = NULL;
+	hfi1_free_ctxt(dd, rcd);
+	return -ENOMEM;
+}
+
+/**
+ * hfi1_free_ctxt
+ * @dd: Pointer to a valid device
+ * @rcd: pointer to an initialized rcd data structure
+ *
+ * This is the "free" to match the _create_ctxtdata (alloc) function.
+ * This is the final "put" for the kref.
+ */
+void hfi1_free_ctxt(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
+{
+	unsigned long flags;
+
+	if (rcd) {
+		spin_lock_irqsave(&dd->uctxt_lock, flags);
+		dd->rcd[rcd->ctxt] = NULL;
+		spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+		hfi1_rcd_put(rcd);
+	}
 }
 
 /*
diff --git a/drivers/infiniband/hw/hfi1/vnic_main.c b/drivers/infiniband/hw/hfi1/vnic_main.c
index 89b0564..c91456c 100644
--- a/drivers/infiniband/hw/hfi1/vnic_main.c
+++ b/drivers/infiniband/hw/hfi1/vnic_main.c
@@ -106,22 +106,13 @@ static int allocate_vnic_ctxt(struct hfi1_devdata *dd,
 			      struct hfi1_ctxtdata **vnic_ctxt)
 {
 	struct hfi1_ctxtdata *uctxt;
-	u16 ctxt;
 	int ret;
 
 	if (dd->flags & HFI1_FROZEN)
 		return -EIO;
 
-	for (ctxt = dd->first_dyn_alloc_ctxt;
-	     ctxt < dd->num_rcv_contexts; ctxt++)
-		if (!dd->rcd[ctxt])
-			break;
-
-	if (ctxt == dd->num_rcv_contexts)
-		return -EBUSY;
-
-	uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, dd->node);
-	if (!uctxt) {
+	ret = hfi1_create_ctxtdata(dd->pport, dd->node, &uctxt);
+	if (ret < 0) {
 		dd_dev_err(dd, "Unable to create ctxtdata, failing open\n");
 		return -ENOMEM;
 	}
@@ -156,11 +147,10 @@ static int allocate_vnic_ctxt(struct hfi1_devdata *dd,
 	return ret;
 bail:
 	/*
-	 * hfi1_rcd_put() will call hfi1_free_ctxtdata(), which will
+	 * hfi1_free_ctxt() will call hfi1_free_ctxtdata(), which will
 	 * release send_context structure if uctxt->sc is not null
 	 */
-	dd->rcd[uctxt->ctxt] = NULL;
-	hfi1_rcd_put(uctxt);
+	hfi1_free_ctxt(dd, uctxt);
 	dd_dev_dbg(dd, "vnic allocation failed. rc %d\n", ret);
 	return ret;
 }
@@ -201,14 +191,14 @@ static void deallocate_vnic_ctxt(struct hfi1_devdata *dd,
 	dd->send_contexts[uctxt->sc->sw_index].type = SC_USER;
 	spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 
-	dd->rcd[uctxt->ctxt] = NULL;
 	uctxt->event_flags = 0;
 
 	hfi1_clear_tids(uctxt);
 	hfi1_clear_ctxt_pkey(dd, uctxt);
 
 	hfi1_stats.sps_ctxts--;
-	hfi1_rcd_put(uctxt);
+
+	hfi1_free_ctxt(dd, uctxt);
 }
 
 void hfi1_vnic_setup(struct hfi1_devdata *dd)

--
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