linux-kernel - [PATCH] habanalabs: cannot sleep while holding spinlock

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Date:   Sun, 22 Aug 2021 12:04:34 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     farah kassabri <fkassabri@...ana.ai>
Subject: [PATCH] habanalabs: cannot sleep while holding spinlock

From: farah kassabri <fkassabri@...ana.ai>

Fix 2 areas in the code where it's possible the code will
go to sleep while holding a spinlock.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: farah kassabri <fkassabri@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/command_buffer.c | 2 --
 drivers/misc/habanalabs/common/memory.c         | 2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c
index 58afefcd74f3..8132a84698d5 100644
--- a/drivers/misc/habanalabs/common/command_buffer.c
+++ b/drivers/misc/habanalabs/common/command_buffer.c
@@ -314,8 +314,6 @@ int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
 
 	spin_lock(&mgr->cb_lock);
 	rc = idr_alloc(&mgr->cb_handles, cb, 1, 0, GFP_ATOMIC);
-	if (rc < 0)
-		rc = idr_alloc(&mgr->cb_handles, cb, 1, 0, GFP_KERNEL);
 	spin_unlock(&mgr->cb_lock);
 
 	if (rc < 0) {
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index 72954abf20fe..8cf5437c0390 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -126,7 +126,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 
 	spin_lock(&vm->idr_lock);
 	handle = idr_alloc(&vm->phys_pg_pack_handles, phys_pg_pack, 1, 0,
-				GFP_KERNEL);
+				GFP_ATOMIC);
 	spin_unlock(&vm->idr_lock);
 
 	if (handle < 0) {
-- 
2.17.1