mpt2sas: [Resend] Power cycling cascaded expanders causes kernel panic

PATCH In review Kashyap, Desai 1 participant 1 message Aug 5, 2009 SCSI

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Kashyap, Desai

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2009-08-05 06:04 UTC #0 lore raw

PATCH 1/11 mpt2sas: [Resend] Power cycling cascaded expanders causes kernel panic

Kernel panic is seen because of enclosure_handle received from FW is zero.

Check is introduced before calling mpt2sas_config_get_enclosure_pg0.
---

Signed-off-by Kashyap Desai <[email protected]>

Signed-off-by Eric Moore <[email protected]>

---

drivers/scsi/mpt2sas/mpt2sas_scsih.c +3 -4

index 2a01a5f..b1326bf 100644
@@ -3663,12 +3663,11 @@ _scsih_add_device(struct MPT2SAS_ADAPTER *ioc, u16 handle, u8 phy_num, u8 is_pd)
 	sas_device->hidden_raid_component = is_pd;
 
 	/* get enclosure_logical_id */
-	if (!(mpt2sas_config_get_enclosure_pg0(ioc, &mpi_reply, &enclosure_pg0,
-	   MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
-	   sas_device->enclosure_handle))) {
+	if (sas_device->enclosure_handle && !(mpt2sas_config_get_enclosure_pg0(
+	   ioc, &mpi_reply, &enclosure_pg0, MPI2_SAS_ENCLOS_PGAD_FORM_HANDLE,
+	   sas_device->enclosure_handle)))
 		sas_device->enclosure_logical_id =
 		    le64_to_cpu(enclosure_pg0.EnclosureLogicalID);
-	}
 
 	/* get device name */
 	sas_device->device_name = le64_to_cpu(sas_device_pg0.DeviceName);