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driver acr122_usb: fix dead code issue

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Redundant result check leading to dead code was probably indicative
of a missing return value check of acr122_usb_send_apdu()

Problem reported by Coverity:
  at_least: At condition "res < 0", the value of "res" must be at least 12.
  cannot_single: At condition "res < 0", the value of "res" cannot be equal to -6.
  dead_error_condition: The condition "res < 0" cannot be true.
CID 1090327 (#1 of 1): Logically dead code (DEADCODE)
  dead_error_begin: Execution cannot reach this statement "acr122_usb_ack(pnd);".
This commit is contained in:
Philippe Teuwen 2013-09-22 19:06:48 +02:00
parent 117b58f501
commit 9bb568b799
1 changed files with 17 additions and 17 deletions
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14
libnfc/drivers/acr122_usb.c
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@ -616,6 +616,8 @@ read:
} }
if (res < 12) { if (res < 12) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Invalid RDR_to_PC_DataBlock frame"); log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Invalid RDR_to_PC_DataBlock frame");
// try to interrupt current device state
acr122_usb_ack(pnd);
pnd->last_error = NFC_EIO; pnd->last_error = NFC_EIO;
return pnd->last_error; return pnd->last_error;
} }
@ -644,9 +646,7 @@ read:
pnd->last_error = NFC_EIO; pnd->last_error = NFC_EIO;
return pnd->last_error; return pnd->last_error;
} }
acr122_usb_send_apdu(pnd, APDU_GetAdditionnalData, 0x00, 0x00, NULL, 0, abtRxBuf[11], abtRxBuf, sizeof(abtRxBuf)); res = acr122_usb_send_apdu(pnd, APDU_GetAdditionnalData, 0x00, 0x00, NULL, 0, abtRxBuf[11], abtRxBuf, sizeof(abtRxBuf));
}
offset = 0;
if (res == NFC_ETIMEOUT) { if (res == NFC_ETIMEOUT) {
if (DRIVER_DATA(pnd)->abort_flag) { if (DRIVER_DATA(pnd)->abort_flag) {
DRIVER_DATA(pnd)->abort_flag = false; DRIVER_DATA(pnd)->abort_flag = false;
@ -657,14 +657,14 @@ read:
goto read; // FIXME May cause some trouble on Touchatag, right ? goto read; // FIXME May cause some trouble on Touchatag, right ?
} }
} }
if (res < 12) {
if (res < 0) {
// try to interrupt current device state // try to interrupt current device state
acr122_usb_ack(pnd); acr122_usb_ack(pnd);
pnd->last_error = res; pnd->last_error = NFC_EIO;
return pnd->last_error; return pnd->last_error;
} }
}
offset = 0;
if (abtRxBuf[offset] != attempted_response) { if (abtRxBuf[offset] != attempted_response) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Frame header mismatch"); log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Frame header mismatch");
pnd->last_error = NFC_EIO; pnd->last_error = NFC_EIO;