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authorVinicius Costa Gomes <vinicius.gomes@intel.com>2023-04-18 00:18:39 +0200
committerTony Nguyen <anthony.l.nguyen@intel.com>2023-06-12 22:18:30 +0200
commitc080fe262f9e73a00934b70c16b1479cf40cd2bd (patch)
tree356154f8a91145391adec8a739c2b8c3e4980b88
parentigc: Clean the TX buffer and TX descriptor ring (diff)
downloadlinux-c080fe262f9e73a00934b70c16b1479cf40cd2bd.tar.xz
linux-c080fe262f9e73a00934b70c16b1479cf40cd2bd.zip
igc: Fix possible system crash when loading module
Guarantee that when probe() is run again, PTM and PCI busmaster will be in the same state as it was if the driver was never loaded. Avoid an i225/i226 hardware issue that PTM requests can be made even though PCI bus mastering is not enabled. These unexpected PTM requests can crash some systems. So, "force" disable PTM and busmastering before removing the driver, so they can be re-enabled in the right order during probe(). This is more like a workaround and should be applicable for i225 and i226, in any platform. Fixes: 1b5d73fb8624 ("igc: Enable PCIe PTM") Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Reviewed-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com> Tested-by: Naama Meir <naamax.meir@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
-rw-r--r--drivers/net/ethernet/intel/igc/igc_main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index f986e88be5c1..fa764190f270 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6730,6 +6730,9 @@ static void igc_remove(struct pci_dev *pdev)
igc_ptp_stop(adapter);
+ pci_disable_ptm(pdev);
+ pci_clear_master(pdev);
+
set_bit(__IGC_DOWN, &adapter->state);
del_timer_sync(&adapter->watchdog_timer);