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Date: Mon, 1 Nov 2021 10:17:18 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.9 09/20] nfc: port100: fix using -ERRNO as command type mask From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> commit 2195f2062e4cc93870da8e71c318ef98a1c51cef upstream. 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> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/nfc/port100.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/nfc/port100.c +++ b/drivers/nfc/port100.c @@ -1011,11 +1011,11 @@ static u64 port100_get_command_type_mask 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;
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