net: intel: e1000e: fix possible sleep-in-atomic-context bugs in e1000e_get_hw_semaph...

The driver may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:

drivers/net/ethernet/intel/e1000e/mac.c, 1366:
	usleep_range in e1000e_get_hw_semaphore
drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322:
	e1000e_get_hw_semaphore in e1000_release_swfw_sync_80003es2lan
drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197:
	e1000_release_swfw_sync_80003es2lan in e1000_release_phy_80003es2lan
drivers/net/ethernet/intel/e1000e/netdev.c, 4883:
	(FUNC_PTR) e1000_release_phy_80003es2lan in e1000e_update_phy_stats
drivers/net/ethernet/intel/e1000e/netdev.c, 4917:
	e1000e_update_phy_stats in e1000e_update_stats
drivers/net/ethernet/intel/e1000e/netdev.c, 5945:
	e1000e_update_stats in e1000e_get_stats64
drivers/net/ethernet/intel/e1000e/netdev.c, 5944:
	spin_lock in e1000e_get_stats64

drivers/net/ethernet/intel/e1000e/mac.c, 1384:
	usleep_range in e1000e_get_hw_semaphore
drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322:
	e1000e_get_hw_semaphore in e1000_release_swfw_sync_80003es2lan
drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197:
	e1000_release_swfw_sync_80003es2lan in e1000_release_phy_80003es2lan
drivers/net/ethernet/intel/e1000e/netdev.c, 4883:
	(FUNC_PTR) e1000_release_phy_80003es2lan in e1000e_update_phy_stats
drivers/net/ethernet/intel/e1000e/netdev.c, 4917:
	e1000e_update_phy_stats in e1000e_update_stats
drivers/net/ethernet/intel/e1000e/netdev.c, 5945:
	e1000e_update_stats in e1000e_get_stats64
drivers/net/ethernet/intel/e1000e/netdev.c, 5944:
	spin_lock in e1000e_get_stats64

(FUNC_PTR) means a function pointer is called.

To fix these bugs, usleep_range() is replaced with udelay().

These bugs are found by a static analysis tool STCheck written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/e1000e/mac.c b/drivers/net/ethernet/intel/e1000e/mac.c
index e531976f8a6774a5231b6ced70c64ea599bfcced..51512a73fdd07f0c3dd02a59921009b3e4037687 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/mac.c
+++ b/drivers/net/ethernet/intel/e1000e/mac.c
@@ -1363,7 +1363,7 @@ s32 e1000e_get_hw_semaphore(struct e1000_hw *hw)
                if (!(swsm & E1000_SWSM_SMBI))
                        break;
 
-               usleep_range(50, 100);
+               udelay(100);
                i++;
        }
 
@@ -1381,7 +1381,7 @@ s32 e1000e_get_hw_semaphore(struct e1000_hw *hw)
                if (er32(SWSM) & E1000_SWSM_SWESMBI)
                        break;
 
-               usleep_range(50, 100);
+               udelay(100);
        }
 
        if (i == timeout) {