linux-kernel - [PATCH 02/11] habanalabs: remove in

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Date:   Tue, 14 Dec 2021 17:05:42 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 02/11] habanalabs: remove in_debug check in device open

The driver supports only a single user anyway, so there is no point
in checking whether we are in_debug state when a user tries to open
the device, because if we are in_debug, it means a user is already
using the device.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/habanalabs.h     | 5 +++--
 drivers/misc/habanalabs/common/habanalabs_drv.c | 8 --------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index eda1c70f6966..362eee3f028c 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -2561,8 +2561,9 @@ struct last_error_session_info {
  * @init_done: is the initialization of the device done.
  * @device_cpu_disabled: is the device CPU disabled (due to timeouts)
  * @dma_mask: the dma mask that was set for this device
- * @in_debug: is device under debug. This, together with fpriv_list, enforces
- *            that only a single user is configuring the debug infrastructure.
+ * @in_debug: whether the device is in a state where the profiling/tracing infrastructure
+ *            can be used. This indication is needed because in some ASICs we need to do
+ *            specific operations to enable that infrastructure.
  * @power9_64bit_dma_enable: true to enable 64-bit DMA mask support. Relevant
  *                           only to POWER9 machines.
  * @cdev_sysfs_created: were char devices and sysfs nodes created.
diff --git a/drivers/misc/habanalabs/common/habanalabs_drv.c b/drivers/misc/habanalabs/common/habanalabs_drv.c
index 62a02ef43bb7..d59201f93de9 100644
--- a/drivers/misc/habanalabs/common/habanalabs_drv.c
+++ b/drivers/misc/habanalabs/common/habanalabs_drv.c
@@ -153,14 +153,6 @@ int hl_device_open(struct inode *inode, struct file *filp)
 		goto out_err;
 	}
 
-	if (hdev->in_debug) {
-		dev_err_ratelimited(hdev->dev,
-			"Can't open %s because it is being debugged by another user\n",
-			dev_name(hdev->dev));
-		rc = -EPERM;
-		goto out_err;
-	}
-
 	if (hdev->is_compute_ctx_active) {
 		dev_dbg_ratelimited(hdev->dev,
 			"Can't open %s because another user is working on it\n",
-- 
2.25.1