net: stmmac: do not use a bitwise AND operator with a bool operand

Doing a bitwise AND between a bool and an int is generally not a good idea.
The bool will be promoted to an int with value 0 or 1,
the int is generally regarded as true with a non-zero value,
thus ANDing them has the potential to yield an undesired result.

This commit fixes the following smatch warnings:

drivers/net/ethernet/stmicro/stmmac/enh_desc.c:344 enh_desc_prepare_tx_desc() warn: maybe use && instead of &
drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c:337 dwmac4_rd_prepare_tx_desc() warn: maybe use && instead of &
drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c:380 dwmac4_rd_prepare_tso_tx_desc() warn: maybe use && instead of &

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index 2fd8456..c728ffa 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -334,7 +334,7 @@ static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
        if (tx_own)
                tdes3 |= TDES3_OWN;
 
-       if (is_fs & tx_own)
+       if (is_fs && tx_own)
                /* When the own bit, for the first frame, has to be set, all
                 * descriptors for the same frame has to be set before, to
                 * avoid race condition.
@@ -377,7 +377,7 @@ static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
        if (tx_own)
                tdes3 |= TDES3_OWN;
 
-       if (is_fs & tx_own)
+       if (is_fs && tx_own)
                /* When the own bit, for the first frame, has to be set, all
                 * descriptors for the same frame has to be set before, to
                 * avoid race condition.

diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index b47cb5c..6768a25 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -341,7 +341,7 @@ static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
        if (tx_own)
                tdes0 |= ETDES0_OWN;
 
-       if (is_fs & tx_own)
+       if (is_fs && tx_own)
                /* When the own bit, for the first frame, has to be set, all
                 * descriptors for the same frame has to be set before, to
                 * avoid race condition.