drivers/net/b44: Change to non-atomic bit operations on pwol_mask

[ Upstream commit f11421ba4af706cb4f5703de34fa77fba8472776 ]

Atomic operations that span cache lines are super-expensive on x86
(not just to the current processor, but also to other processes as all
memory operations are blocked until the operation completes). Upcoming
x86 processors have a switch to cause such operations to generate a #AC
trap. It is expected that some real time systems will enable this mode
in BIOS.

In preparation for this, it is necessary to fix code that may execute
atomic instructions with operands that cross cachelines because the #AC
trap will crash the kernel.

Since "pwol_mask" is local and never exposed to concurrency, there is
no need to set bits in pwol_mask using atomic operations.

Directly operate on the byte which contains the bit instead of using
__set_bit() to avoid any big endian concern due to type cast to
unsigned long in __set_bit().

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index 97ab0dd255522bf7b931af63526684145f20c40e..1a7710c399d74c66b32e2f9686e19d5440d897d9 100644 (file)
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -1519,8 +1519,10 @@ static int b44_magic_pattern(u8 *macaddr, u8 *ppattern, u8 *pmask, int offset)
        int ethaddr_bytes = ETH_ALEN;
 
        memset(ppattern + offset, 0xff, magicsync);
-       for (j = 0; j < magicsync; j++)
-               set_bit(len++, (unsigned long *) pmask);
+       for (j = 0; j < magicsync; j++) {
+               pmask[len >> 3] |= BIT(len & 7);
+               len++;
+       }
 
        for (j = 0; j < B44_MAX_PATTERNS; j++) {
                if ((B44_PATTERN_SIZE - len) >= ETH_ALEN)
@@ -1532,7 +1534,8 @@ static int b44_magic_pattern(u8 *macaddr, u8 *ppattern, u8 *pmask, int offset)
                for (k = 0; k< ethaddr_bytes; k++) {
                        ppattern[offset + magicsync +
                                (j * ETH_ALEN) + k] = macaddr[k];
-                       set_bit(len++, (unsigned long *) pmask);
+                       pmask[len >> 3] |= BIT(len & 7);
+                       len++;
                }
        }
        return len - 1;