[TG3]: ethtool -d hangs PCIe systems

Resubmitting after recommendation to use GET_REG32_1() instead of
GET_REG32_LOOP(..., 1).  Retested.  Problem remains fixed.

Prevent tg3_get_regs() from reading reserved and undocumented registers
at RX_CPU_BASE and TX_CPU_BASE offsets which caused hostile behavior
on PCIe platforms.

Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 14 insertions, 2 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index cefb0c08a68d..ce252c58b3e7 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7151,8 +7151,13 @@ do {	p = (u32 *)(orig_p + (reg));		\
         GET_REG32_LOOP(BUFMGR_MODE, 0x58);
         GET_REG32_LOOP(RDMAC_MODE, 0x08);
         GET_REG32_LOOP(WDMAC_MODE, 0x08);
-        GET_REG32_LOOP(RX_CPU_BASE, 0x280);
-        GET_REG32_LOOP(TX_CPU_BASE, 0x280);
+        GET_REG32_1(RX_CPU_MODE);
+        GET_REG32_1(RX_CPU_STATE);
+        GET_REG32_1(RX_CPU_PGMCTR);
+        GET_REG32_1(RX_CPU_HWBKPT);
+        GET_REG32_1(TX_CPU_MODE);
+        GET_REG32_1(TX_CPU_STATE);
+        GET_REG32_1(TX_CPU_PGMCTR);
         GET_REG32_LOOP(GRCMBOX_INTERRUPT_0, 0x110);
         GET_REG32_LOOP(FTQ_RESET, 0x120);
         GET_REG32_LOOP(MSGINT_MODE, 0x0c);
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 94dbcf3537ec..890e1635996b 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -1124,7 +1124,14 @@
 /* 0x280 --> 0x400 unused */
 
 #define RX_CPU_BASE                     0x00005000
+#define RX_CPU_MODE                     0x00005000
+#define RX_CPU_STATE                    0x00005004
+#define RX_CPU_PGMCTR                   0x0000501c
+#define RX_CPU_HWBKPT                   0x00005034
 #define TX_CPU_BASE                     0x00005400
+#define TX_CPU_MODE                     0x00005400
+#define TX_CPU_STATE                    0x00005404
+#define TX_CPU_PGMCTR                   0x0000541c
 
 /* Mailboxes */
 #define GRCMBOX_INTERRUPT_0             0x00005800 /* 64-bit */