FAILED: patch "[PATCH] tpm: tpm_tis: stop transmit if retries are exhausted" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 949692da7211572fac419b2986b6abc0cd1aeb76
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026050324-engulf-headset-e9c2@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 949692da7211572fac419b2986b6abc0cd1aeb76 Mon Sep 17 00:00:00 2001
From: Jacqueline Wong <[email protected]>
Date: Wed, 15 Apr 2026 16:00:06 +0000
Subject: [PATCH] tpm: tpm_tis: stop transmit if retries are exhausted

tpm_tis_send_main() will attempt to retry sending data TPM_RETRY times. Currently, if those retries are exhausted, the driver will attempt to call execute. The TPM will be in the wrong state, leading to the operation simply timing out.

Instead, if there is still an error after retries are exhausted, return that error immediately.

index acb91bf1e5f5..21d79ad3b164 100644
@@ -556,11 +556,16 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
 			break;
 		else if (rc != -EAGAIN && rc != -EIO)
 			/* Data transfer failed, not recoverable */
-			return rc;
+			goto out_err;
 
 		usleep_range(priv->timeout_min, priv->timeout_max);
 	}
 
+	if (rc == -EAGAIN || rc == -EIO) {
+		dev_err(&chip->dev, "Exhausted %d tpm_tis_send_data retries\n", TPM_RETRY);
+		goto out_err;
+	}
+
 	/* go and do it */
 	rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
 	if (rc < 0)