PCI/AER: Log which device prevents error recovery

mainline inclusion
from mainline-v5.6-rc1
commit 01daacfb
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V
CVE: NA

--------------------------------

PCI error recovery will fail if any device under the Root Port doesn't have
an error_detected callback.  Currently only the failure result is printed,
which is not enough to identify the driver that lacks the callback.

Log a message to identify the device with no error_detected callback.

[bhelgaas: tweak log message]
Link: https://lore.kernel.org/r/1576237474-32021-1-git-send-email-yangyicong@hisilicon.comSigned-off-by: NYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Nliyouhong <liyouhong@kylinos.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/pci/pcie/err.c

@@ -69,10 +69,12 @@ static int report_error_detected(struct pci_dev *dev, void *data)
 		 * error callbacks of "any" device in the subtree, and will
 		 * exit in the disconnected error state.
 		 */
-		if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE)
+		if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 			vote = PCI_ERS_RESULT_NO_AER_DRIVER;
-		else
+			pci_info(dev, "AER: Can't recover (no error_detected callback)\n");
+		} else {
 			vote = PCI_ERS_RESULT_NONE;
+		}
 	} else {
 		err_handler = dev->driver->err_handler;
 		vote = err_handler->error_detected(dev, result_data->state);