Merge tag 'misc-habanalabs-fixes-2021-09-29' of https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux into char-misc-linus

Oded writes:

This tag contains the following fix for 5.15-rc4:

- Prevent memset of ioctl arguments in case driver returns -EINTR

* tag 'misc-habanalabs-fixes-2021-09-29' of https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux:
  habanalabs: fix resetting args in wait for CS IOCTL

Author: gregkh

drivers/misc/habanalabs/common/command_submission.c

@@ -2649,11 +2649,18 @@ static int hl_multi_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 free_seq_arr:
 	kfree(cs_seq_arr);
 
-	/* update output args */
-	memset(args, 0, sizeof(*args));
 	if (rc)
 		return rc;
 
+	if (mcs_data.wait_status == -ERESTARTSYS) {
+		dev_err_ratelimited(hdev->dev,
+				"user process got signal while waiting for Multi-CS\n");
+		return -EINTR;
+	}
+
+	/* update output args */
+	memset(args, 0, sizeof(*args));
+
 	if (mcs_data.completion_bitmap) {
 		args->out.status = HL_WAIT_CS_STATUS_COMPLETED;
 		args->out.cs_completion_map = mcs_data.completion_bitmap;
@@ -2667,8 +2674,6 @@ static int hl_multi_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 		/* update if some CS was gone */
 		if (mcs_data.timestamp)
 			args->out.flags |= HL_WAIT_CS_STATUS_FLAG_GONE;
-	} else if (mcs_data.wait_status == -ERESTARTSYS) {
-		args->out.status = HL_WAIT_CS_STATUS_INTERRUPTED;
 	} else {
 		args->out.status = HL_WAIT_CS_STATUS_BUSY;
 	}
@@ -2688,16 +2693,17 @@ static int hl_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 	rc = _hl_cs_wait_ioctl(hdev, hpriv->ctx, args->in.timeout_us, seq,
 				&status, &timestamp);
 
+	if (rc == -ERESTARTSYS) {
+		dev_err_ratelimited(hdev->dev,
+			"user process got signal while waiting for CS handle %llu\n",
+			seq);
+		return -EINTR;
+	}
+
 	memset(args, 0, sizeof(*args));
 
 	if (rc) {
-		if (rc == -ERESTARTSYS) {
-			dev_err_ratelimited(hdev->dev,
-				"user process got signal while waiting for CS handle %llu\n",
-				seq);
-			args->out.status = HL_WAIT_CS_STATUS_INTERRUPTED;
-			rc = -EINTR;
-		} else if (rc == -ETIMEDOUT) {
+		if (rc == -ETIMEDOUT) {
 			dev_err_ratelimited(hdev->dev,
 				"CS %llu has timed-out while user process is waiting for it\n",
 				seq);
@@ -2823,7 +2829,6 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 		dev_err_ratelimited(hdev->dev,
 			"user process got signal while waiting for interrupt ID %d\n",
 			interrupt->interrupt_id);
-		*status = HL_WAIT_CS_STATUS_INTERRUPTED;
 		rc = -EINTR;
 	} else {
 		*status = CS_WAIT_STATUS_BUSY;
@@ -2878,8 +2883,6 @@ static int hl_interrupt_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 				args->in.interrupt_timeout_us, args->in.addr,
 				args->in.target, interrupt_offset, &status);
 
-	memset(args, 0, sizeof(*args));
-
 	if (rc) {
 		if (rc != -EINTR)
 			dev_err_ratelimited(hdev->dev,
@@ -2888,6 +2891,8 @@ static int hl_interrupt_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 		return rc;
 	}
 
+	memset(args, 0, sizeof(*args));
+
 	switch (status) {
 	case CS_WAIT_STATUS_COMPLETED:
 		args->out.status = HL_WAIT_CS_STATUS_COMPLETED;

include/uapi/misc/habanalabs.h

@@ -917,7 +917,6 @@ struct hl_wait_cs_in {
 #define HL_WAIT_CS_STATUS_BUSY		1
 #define HL_WAIT_CS_STATUS_TIMEDOUT	2
 #define HL_WAIT_CS_STATUS_ABORTED	3
-#define HL_WAIT_CS_STATUS_INTERRUPTED	4
 
 #define HL_WAIT_CS_STATUS_FLAG_GONE		0x1
 #define HL_WAIT_CS_STATUS_FLAG_TIMESTAMP_VLD	0x2
@@ -1286,16 +1285,15 @@ struct hl_debug_args {
  * EIO       - The CS was aborted (usually because the device was reset)
  * ENODEV    - The device wants to do hard-reset (so user need to close FD)
  *
- * The driver also returns a custom define inside the IOCTL which can be:
+ * The driver also returns a custom define in case the IOCTL call returned 0.
+ * The define can be one of the following:
  *
  * HL_WAIT_CS_STATUS_COMPLETED   - The CS has been completed successfully (0)
  * HL_WAIT_CS_STATUS_BUSY        - The CS is still executing (0)
  * HL_WAIT_CS_STATUS_TIMEDOUT    - The CS has caused a timeout on the device
  *                                 (ETIMEDOUT)
  * HL_WAIT_CS_STATUS_ABORTED     - The CS was aborted, usually because the
  *                                 device was reset (EIO)
- * HL_WAIT_CS_STATUS_INTERRUPTED - Waiting for the CS was interrupted (EINTR)
- *
  */
 
 #define HL_IOCTL_WAIT_CS			\