e1000e: test for valid check_reset_block function pointer
commit 44abd5c12767a8c567dc4e45fd9aec3b13ca85e0 introduced NULL pointer
dereferences when attempting to access the check_reset_block function
pointer on 8257x and 80003es2lan non-copper devices.
This fix should be applied back through 3.4.
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@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 026e8b3..a134399 100644
--- a/drivers/net/ethernet/intel/e1000e/mac.c
+++ b/drivers/net/ethernet/intel/e1000e/mac.c
@@ -709,7 +709,7 @@
* In the case of the phy reset being blocked, we already have a link.
* We do not need to set it up again.
*/
- if (hw->phy.ops.check_reset_block(hw))
+ if (hw->phy.ops.check_reset_block && hw->phy.ops.check_reset_block(hw))
return 0;
/*