linux-kernel - [PATCH 5/7] habanalabs: handle case of interruptable wait

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Date:   Thu,  1 Jul 2021 14:27:15 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] habanalabs: handle case of interruptable wait

Same as we handle it in the regular wait for CS, we need to handle the
case where the waiting for user interrupt was interrupted. In that case,
we need to return correct error code to the user.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/command_submission.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c
index 12f20446e99a..997a37e78241 100644
--- a/drivers/misc/habanalabs/common/command_submission.c
+++ b/drivers/misc/habanalabs/common/command_submission.c
@@ -2102,6 +2102,12 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 			spin_unlock(&interrupt->wait_list_lock);
 			goto wait_again;
 		}
+	} else if (completion_rc == -ERESTARTSYS) {
+		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;
 	}
@@ -2159,8 +2165,9 @@ static int hl_interrupt_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 	memset(args, 0, sizeof(*args));
 
 	if (rc) {
-		dev_err_ratelimited(hdev->dev,
-			"interrupt_wait_ioctl failed (%d)\n", rc);
+		if (rc != -EINTR)
+			dev_err_ratelimited(hdev->dev,
+				"interrupt_wait_ioctl failed (%d)\n", rc);
 
 		return rc;
 	}
-- 
2.25.1