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nfc: port100: fix using -ERRNO as command type mask

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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@vger.kernel.org>
Fixes: 0347a6ab300a ("NFC: port100: Commands mechanism implementation")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Kozlowski 2021-10-25 16:49:36 +02:00 committed by Greg Kroah-Hartman
parent 875483783c
commit e316ae47ff
1 changed files with 2 additions and 2 deletions
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4
drivers/nfc/port100.c
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@ -1011,11 +1011,11 @@ 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;