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cxgb4/chcr: avoid -Wreturn-local-addr warning

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gcc-10 warns about functions that return a pointer to a stack
variable. In chcr_write_cpl_set_tcb_ulp(), this does not actually
happen, but it's too hard to see for the compiler:

drivers/crypto/chelsio/chcr_ktls.c: In function 'chcr_write_cpl_set_tcb_ulp.constprop':
drivers/crypto/chelsio/chcr_ktls.c:760:9: error: function may return address of local variable [-Werror=return-local-addr]
  760 |  return pos;
      |         ^~~
drivers/crypto/chelsio/chcr_ktls.c:712:5: note: declared here
  712 |  u8 buf[48] = {0};
      |     ^~~

Split the middle part of the function out into a helper to make
it easier to understand by both humans and compilers, which avoids
the warning.

Fixes: 5a4b9fe7fe ("cxgb4/chcr: complete record tx handling")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2020-04-30 12:39:02 +02:00 committed by David S. Miller
parent c649c41d5d
commit 071a43e660
1 changed files with 46 additions and 37 deletions
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83
drivers/crypto/chelsio/chcr_ktls.c
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@ -673,41 +673,14 @@ int chcr_ktls_cpl_set_tcb_rpl(struct adapter *adap, unsigned char *input)
return 0;
}
/*
* chcr_write_cpl_set_tcb_ulp: update tcb values.
* TCB is responsible to create tcp headers, so all the related values
* should be correctly updated.
* @tx_info - driver specific tls info.
* @q - tx queue on which packet is going out.
* @tid - TCB identifier.
* @pos - current index where should we start writing.
* @word - TCB word.
* @mask - TCB word related mask.
* @val - TCB word related value.
* @reply - set 1 if looking for TP response.
* return - next position to write.
*/
static void *chcr_write_cpl_set_tcb_ulp(struct chcr_ktls_info *tx_info,
struct sge_eth_txq *q, u32 tid,
void *pos, u16 word, u64 mask,
static void *__chcr_write_cpl_set_tcb_ulp(struct chcr_ktls_info *tx_info,
u32 tid, void *pos, u16 word, u64 mask,
u64 val, u32 reply)
{
struct cpl_set_tcb_field_core *cpl;
struct ulptx_idata *idata;
struct ulp_txpkt *txpkt;
void *save_pos = NULL;
u8 buf[48] = {0};
int left;
left = (void *)q->q.stat - pos;
if (unlikely(left < CHCR_SET_TCB_FIELD_LEN)) {
if (!left) {
pos = q->q.desc;
} else {
save_pos = pos;
pos = buf;
}
}
/* ULP_TXPKT */
txpkt = pos;
txpkt->cmd_dest = htonl(ULPTX_CMD_V(ULP_TX_PKT) | ULP_TXPKT_DEST_V(0));
@ -732,18 +705,54 @@ static void *chcr_write_cpl_set_tcb_ulp(struct chcr_ktls_info *tx_info,
idata = (struct ulptx_idata *)(cpl + 1);
idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_NOOP));
idata->len = htonl(0);
pos = idata + 1;
if (save_pos) {
pos = chcr_copy_to_txd(buf, &q->q, save_pos,
CHCR_SET_TCB_FIELD_LEN);
} else {
/* check again if we are at the end of the queue */
if (left == CHCR_SET_TCB_FIELD_LEN)
return pos;
}
/*
* chcr_write_cpl_set_tcb_ulp: update tcb values.
* TCB is responsible to create tcp headers, so all the related values
* should be correctly updated.
* @tx_info - driver specific tls info.
* @q - tx queue on which packet is going out.
* @tid - TCB identifier.
* @pos - current index where should we start writing.
* @word - TCB word.
* @mask - TCB word related mask.
* @val - TCB word related value.
* @reply - set 1 if looking for TP response.
* return - next position to write.
*/
static void *chcr_write_cpl_set_tcb_ulp(struct chcr_ktls_info *tx_info,
struct sge_eth_txq *q, u32 tid,
void *pos, u16 word, u64 mask,
u64 val, u32 reply)
{
int left = (void *)q->q.stat - pos;
if (unlikely(left < CHCR_SET_TCB_FIELD_LEN)) {
if (!left) {
pos = q->q.desc;
else
pos = idata + 1;
} else {
u8 buf[48] = {0};
__chcr_write_cpl_set_tcb_ulp(tx_info, tid, buf, word,
mask, val, reply);
return chcr_copy_to_txd(buf, &q->q, pos,
CHCR_SET_TCB_FIELD_LEN);
}
}
pos = __chcr_write_cpl_set_tcb_ulp(tx_info, tid, pos, word,
mask, val, reply);
/* check again if we are at the end of the queue */
if (left == CHCR_SET_TCB_FIELD_LEN)
pos = q->q.desc;
return pos;
}