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From: Christophe JAILLET <>
	Christophe JAILLET <>,
	Dan Carpenter <>
Subject: [PATCH] tty: nozomi: Fix the error handling path of 'nozomi_card_init()'
Date: Tue, 25 May 2021 20:51:57 +0200
Message-ID: <> (raw)

The error handling path is broken and we may un-register things that have
never been registered.

Update the loops index accordingly.

Fixes: 9842c38e9176 ("kfifo: fix warn_unused_result")
Suggested-by: Dan Carpenter <>
Signed-off-by: Christophe JAILLET <>
PORT_MDM is 0, so it does not really matter, but I wonder why one of the
for loop starts at PORT_MDM, while the other one explicitly starts at 0.

We have the same in the remove function, where 0 is used in both cases.
 drivers/tty/nozomi.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
index b85d4beabc1f..0c80f25c8c3d 100644
--- a/drivers/tty/nozomi.c
+++ b/drivers/tty/nozomi.c
@@ -1378,7 +1378,7 @@ static int nozomi_card_init(struct pci_dev *pdev,
 			NOZOMI_NAME, dc);
 	if (unlikely(ret)) {
 		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
-		goto err_free_kfifo;
+		goto err_free_all_kfifo;
 	DBG1("base_addr: %p", dc->base_addr);
@@ -1416,13 +1416,15 @@ static int nozomi_card_init(struct pci_dev *pdev,
 	return 0;
-	for (i = 0; i < MAX_PORT; ++i) {
+	for (i--; i >= 0; i--) {
 		tty_unregister_device(ntty_driver, dc->index_start + i);
 	free_irq(pdev->irq, dc);
+	i = MAX_PORT;
-	for (i = 0; i < MAX_PORT; i++)
+	for (i--; i >= PORT_MDM; i--)

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