[PATCH] driver core: safely unbind drivers for devices not on a bus

[linux-2.6-omap-h63xx.git] / drivers / scsi / ipr.c

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 2bba5e55d7bc6110d44aa6720280e12d4b79cbe6..5890e5f92d820c6fcf6c18e983636933bc45d313 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -5830,6 +5830,109 @@ static void ipr_initiate_ioa_reset(struct ipr_ioa_cfg *ioa_cfg,
                                shutdown_type);
 }
 
+/**
+ * ipr_reset_freeze - Hold off all I/O activity
+ * @ipr_cmd:   ipr command struct
+ *
+ * Description: If the PCI slot is frozen, hold off all I/O
+ * activity; then, as soon as the slot is available again,
+ * initiate an adapter reset.
+ */
+static int ipr_reset_freeze(struct ipr_cmnd *ipr_cmd)
+{
+       /* Disallow new interrupts, avoid loop */
+       ipr_cmd->ioa_cfg->allow_interrupts = 0;
+       list_add_tail(&ipr_cmd->queue, &ipr_cmd->ioa_cfg->pending_q);
+       ipr_cmd->done = ipr_reset_ioa_job;
+       return IPR_RC_JOB_RETURN;
+}
+
+/**
+ * ipr_pci_frozen - Called when slot has experienced a PCI bus error.
+ * @pdev:      PCI device struct
+ *
+ * Description: This routine is called to tell us that the PCI bus
+ * is down. Can't do anything here, except put the device driver
+ * into a holding pattern, waiting for the PCI bus to come back.
+ */
+static void ipr_pci_frozen(struct pci_dev *pdev)
+{
+       unsigned long flags = 0;
+       struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+       spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+       _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_freeze, IPR_SHUTDOWN_NONE);
+       spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+}
+
+/**
+ * ipr_pci_slot_reset - Called when PCI slot has been reset.
+ * @pdev:      PCI device struct
+ *
+ * Description: This routine is called by the pci error recovery
+ * code after the PCI slot has been reset, just before we
+ * should resume normal operations.
+ */
+static pci_ers_result_t ipr_pci_slot_reset(struct pci_dev *pdev)
+{
+       unsigned long flags = 0;
+       struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+       spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+       _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_restore_cfg_space,
+                                        IPR_SHUTDOWN_NONE);
+       spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+       return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * ipr_pci_perm_failure - Called when PCI slot is dead for good.
+ * @pdev:      PCI device struct
+ *
+ * Description: This routine is called when the PCI bus has
+ * permanently failed.
+ */
+static void ipr_pci_perm_failure(struct pci_dev *pdev)
+{
+       unsigned long flags = 0;
+       struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+       spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+       if (ioa_cfg->sdt_state == WAIT_FOR_DUMP)
+               ioa_cfg->sdt_state = ABORT_DUMP;
+       ioa_cfg->reset_retries = IPR_NUM_RESET_RELOAD_RETRIES;
+       ioa_cfg->in_ioa_bringdown = 1;
+       ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
+       spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+}
+
+/**
+ * ipr_pci_error_detected - Called when a PCI error is detected.
+ * @pdev:      PCI device struct
+ * @state:     PCI channel state
+ *
+ * Description: Called when a PCI error is detected.
+ *
+ * Return value:
+ *     PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
+ */
+static pci_ers_result_t ipr_pci_error_detected(struct pci_dev *pdev,
+                                              pci_channel_state_t state)
+{
+       switch (state) {
+       case pci_channel_io_frozen:
+               ipr_pci_frozen(pdev);
+               return PCI_ERS_RESULT_NEED_RESET;
+       case pci_channel_io_perm_failure:
+               ipr_pci_perm_failure(pdev);
+               return PCI_ERS_RESULT_DISCONNECT;
+               break;
+       default:
+               break;
+       }
+       return PCI_ERS_RESULT_NEED_RESET;
+}
+
 /**
  * ipr_probe_ioa_part2 - Initializes IOAs found in ipr_probe_ioa(..)
  * @ioa_cfg:   ioa cfg struct
@@ -6601,12 +6704,18 @@ static struct pci_device_id ipr_pci_table[] __devinitdata = {
 };
 MODULE_DEVICE_TABLE(pci, ipr_pci_table);
 
+static struct pci_error_handlers ipr_err_handler = {
+       .error_detected = ipr_pci_error_detected,
+       .slot_reset = ipr_pci_slot_reset,
+};
+
 static struct pci_driver ipr_driver = {
        .name = IPR_NAME,
        .id_table = ipr_pci_table,
        .probe = ipr_probe,
        .remove = ipr_remove,
        .shutdown = ipr_shutdown,
+       .err_handler = &ipr_err_handler,
 };
 
 /**