linux-kernel - [PATCH v2] nfc: port100: fix using -ERRNO as command type mask

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Message-Id: <20211025144936.556495-1-krzysztof.kozlowski@canonical.com>
Date:   Mon, 25 Oct 2021 16:49:36 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Thierry Escande <thierry.escande@...ux.intel.com>,
        linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: [PATCH v2] nfc: port100: fix using -ERRNO as command type mask

During probing, the driver tries to get a list (mask) of supported
command types in port100_get_command_type_mask() function.  The value
is u64 and 0 is treated as invalid mask (no commands supported).  The
function however returns also -ERRNO as u64 which will be interpret as
valid command mask.

Return 0 on every error case of port100_get_command_type_mask(), so the
probing will stop.

Cc: <stable@...r.kernel.org>
Fixes: 0347a6ab300a ("NFC: port100: Commands mechanism implementation")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

---

Changes since v1:
1. Drop debug code.
---
 drivers/nfc/port100.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 517376c43b86..16ceb763594f 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -1006,11 +1006,11 @@ static u64 port100_get_command_type_mask(struct port100 *dev)
 
 	skb = port100_alloc_skb(dev, 0);
 	if (!skb)
-		return -ENOMEM;
+		return 0;
 
 	resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_COMMAND_TYPE, skb);
 	if (IS_ERR(resp))
-		return PTR_ERR(resp);
+		return 0;
 
 	if (resp->len < 8)
 		mask = 0;
-- 
2.30.2