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Commit 6431f5d7 authored by Sumit.Saxena@lsi.com's avatar Sumit.Saxena@lsi.com Committed by James Bottomley
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[SCSI] megaraid_sas: megaraid_sas driver init fails in kdump kernel 



Problem: When Hardware IOMMU is on, megaraid_sas driver initialization fails
in kdump kernel with LSI MegaRAID controller(device id-0x73).

Actually this issue needs fix in firmware, but for firmware running in field,
this driver fix is proposed to resolve the issue.  At firmware initialization
time, if firmware does not come to ready state, driver will reset the adapter
and retry for firmware transition to ready state unconditionally(not only
executed for kdump kernel).

Signed-off-by: default avatarSumit Saxena <sumit.saxena@lsi.com>
Signed-off-by: default avatarKashyap Desai <kashyap.desai@lsi.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 36f571e9

drivers/scsi/megaraid/megaraid_sas_base.c

+15 −5
Original line number Diff line number Diff line
@@ -3547,11 +3547,21 @@ static int megasas_init_fw(struct megasas_instance *instance) 
		break;

	}



	/*

	 * We expect the FW state to be READY

	 */

	if (megasas_transition_to_ready(instance, 0)) {

		atomic_set(&instance->fw_reset_no_pci_access, 1);

		instance->instancet->adp_reset

			(instance, instance->reg_set);

		atomic_set(&instance->fw_reset_no_pci_access, 0);

		dev_info(&instance->pdev->dev,

			"megasas: FW restarted successfully from %s!\n",

			__func__);



		/*waitting for about 30 second before retry*/

		ssleep(30);



		if (megasas_transition_to_ready(instance, 0))

			goto fail_ready_state;

	}



	/*

	 * MSI-X host index 0 is common for all adapter.