jsm: adding EEH handlers

Adding EEH handlers for the serial jsm driver. This patch adds
the PCI error handlers and also register them to be called when
a error is detected.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Acked-by: Scott Kilau <scottk@digi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/jsm/jsm_driver.c b/drivers/serial/jsm/jsm_driver.c
index 48326f7..108c3e0 100644 (file)
--- a/drivers/serial/jsm/jsm_driver.c
+++ b/drivers/serial/jsm/jsm_driver.c
@@ -48,6 +48,17 @@ struct uart_driver jsm_uart_driver = {
        .nr             = NR_PORTS,
 };
 
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+                                       pci_channel_state_t state);
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
+static void jsm_io_resume(struct pci_dev *pdev);
+
+static struct pci_error_handlers jsm_err_handler = {
+       .error_detected = jsm_io_error_detected,
+       .slot_reset = jsm_io_slot_reset,
+       .resume = jsm_io_resume,
+};
+
 int jsm_debug;
 module_param(jsm_debug, int, 0);
 MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
@@ -164,6 +175,7 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device
        }
 
        pci_set_drvdata(pdev, brd);
+       pci_save_state(pdev);
 
        return 0;
  out_free_irq:
@@ -222,8 +234,42 @@ static struct pci_driver jsm_driver = {
        .id_table       = jsm_pci_tbl,
        .probe          = jsm_probe_one,
        .remove         = __devexit_p(jsm_remove_one),
+       .err_handler    = &jsm_err_handler,
 };
 
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+                                       pci_channel_state_t state)
+{
+       struct jsm_board *brd = pci_get_drvdata(pdev);
+
+       jsm_remove_uart_port(brd);
+
+       return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
+{
+       int rc;
+
+       rc = pci_enable_device(pdev);
+
+       if (rc)
+               return PCI_ERS_RESULT_DISCONNECT;
+
+       pci_set_master(pdev);
+
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void jsm_io_resume(struct pci_dev *pdev)
+{
+       struct jsm_board *brd = pci_get_drvdata(pdev);
+
+       pci_restore_state(pdev);
+
+       jsm_uart_port_init(brd);
+}
+
 static int __init jsm_init_module(void)
 {
        int rc;

diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index 1bcad59..cd95e21 100644 (file)
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -430,7 +430,7 @@ int __devinit jsm_tty_init(struct jsm_board *brd)
        return 0;
 }
 
-int __devinit jsm_uart_port_init(struct jsm_board *brd)
+int jsm_uart_port_init(struct jsm_board *brd)
 {
        int i;
        unsigned int line;