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NFC: digital: Fix sens_res endiannes handling

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This was triggered by the following sparse warning:

net/nfc/digital_technology.c:272:20: sparse: cast to restricted __be16

The SENS_RES response must be treated as __le16 with the first byte
received as LSB and the second one as MSB. This is the way neard
handles it in the sens_res field of the nfc_target structure which is
treated as u16 in cpu endianness. So le16_to_cpu() is used on the
received SENS_RES instead of memcpy'ing it.

SENS_RES test macros have also been fixed accordingly.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande 2013-09-24 11:47:34 +02:00 committed by Samuel Ortiz
parent 4cf7e03296
commit 13292c9a1e
1 changed files with 6 additions and 9 deletions
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15
net/nfc/digital_technology.c
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@ -32,10 +32,10 @@
#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)
#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x000C) == 0x000C)
#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)
#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
((!((sens_res) & 0x1F00) && (((sens_res) & 0x000C) == 0x000C)) || \
(((sens_res) & 0x1F00) && ((sens_res) & 0x000C) != 0x000C))
((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
(((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))
#define DIGITAL_MIFARE_READ_RES_LEN 16
#define DIGITAL_MIFARE_ACK_RES 0x0A
@ -280,7 +280,6 @@ static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
struct sk_buff *resp)
{
struct nfc_target *target = NULL;
u16 sens_res;
int rc;
if (IS_ERR(resp)) {
@ -300,17 +299,15 @@ static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
goto exit;
}
memcpy(&target->sens_res, resp->data, sizeof(u16));
target->sens_res = __le16_to_cpu(*(__le16 *)resp->data);
sens_res = be16_to_cpu(target->sens_res);
if (!DIGITAL_SENS_RES_IS_VALID(sens_res)) {
if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) {
PROTOCOL_ERR("4.6.3.3");
rc = -EINVAL;
goto exit;
}
if (DIGITAL_SENS_RES_IS_T1T(sens_res))
if (DIGITAL_SENS_RES_IS_T1T(target->sens_res))
rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
else
rc = digital_in_send_sdd_req(ddev, target);