[PATCH 3.4 64/88] mpt2sas: Fix for device scan following host reset could get stuck in a infinite loop

From: Greg Kroah-Hartman
Date: Mon Jun 09 2014 - 20:33:16 EST

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3.4-stable review patch. If anyone has any objections, please let me know.

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

From: Sreekanth Reddy <Sreekanth.Reddy@xxxxxxx>

commit 6241f22ca12a26ee149cbe31b27bac97dbdc8bc4 upstream.

Modified device scan routine so each configuration page read breaks from the
while loop when the ioc_status is not equal to MPI2_IOCSTATUS_SUCCESS.

[jejb: checkpatch fixes]
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@xxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
[bwh: Backported to 3.2; adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Rui Xiang <rui.xiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/scsi/mpt2sas/mpt2sas_scsih.c | 118 ++++++++++++++++++++++++++++++++++-
1 file changed, 115 insertions(+), 3 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -7039,11 +7039,14 @@ _scsih_scan_for_devices_after_reset(stru
struct _sas_device *sas_device;
struct _sas_node *expander_device;
static struct _raid_device *raid_device;
+ u8 retry_count;

printk(MPT2SAS_INFO_FMT "scan devices: start\n", ioc->name);

_scsih_sas_host_refresh(ioc);

+ printk(MPT2SAS_INFO_FMT "\tscan devices: expanders start\n",
+ ioc->name);
/* expanders */
handle = 0xFFFF;
while (!(mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
@@ -7052,19 +7055,39 @@ _scsih_scan_for_devices_after_reset(stru
MPI2_IOCSTATUS_MASK;
if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
break;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from expander scan: "
+ "ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
handle = le16_to_cpu(expander_pg0.DevHandle);
expander_device = mpt2sas_scsih_expander_find_by_sas_address(
ioc, le64_to_cpu(expander_pg0.SASAddress));
if (expander_device)
_scsih_refresh_expander_links(ioc, expander_device,
handle);
- else
+ else {
+ printk(MPT2SAS_INFO_FMT "\tBEFORE adding expander: "
+ "handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(expander_pg0.SASAddress));
_scsih_expander_add(ioc, handle);
+ printk(MPT2SAS_INFO_FMT "\tAFTER adding expander: "
+ "handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(expander_pg0.SASAddress));
+ }
}

+ printk(MPT2SAS_INFO_FMT "\tscan devices: expanders complete\n",
+ ioc->name);
+
if (!ioc->ir_firmware)
goto skip_to_sas;

+ printk(MPT2SAS_INFO_FMT "\tscan devices phys disk start\n", ioc->name);
/* phys disk */
phys_disk_num = 0xFF;
while (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
@@ -7074,6 +7097,13 @@ _scsih_scan_for_devices_after_reset(stru
MPI2_IOCSTATUS_MASK;
if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
break;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from phys disk scan:"
+ "ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
phys_disk_num = pd_pg0.PhysDiskNum;
handle = le16_to_cpu(pd_pg0.DevHandle);
sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
@@ -7083,17 +7113,46 @@ _scsih_scan_for_devices_after_reset(stru
&sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
handle) != 0)
continue;
+ ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+ MPI2_IOCSTATUS_MASK;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from phys disk scan "
+ "ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
if (!_scsih_get_sas_address(ioc, parent_handle,
&sas_address)) {
+ printk(MPT2SAS_INFO_FMT "\tBEFORE adding phys disk: "
+ " handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(sas_device_pg0.SASAddress));
mpt2sas_transport_update_links(ioc, sas_address,
handle, sas_device_pg0.PhyNum,
MPI2_SAS_NEG_LINK_RATE_1_5);
set_bit(handle, ioc->pd_handles);
- _scsih_add_device(ioc, handle, 0, 1);
+ retry_count = 0;
+ /* This will retry adding the end device.
+ * _scsih_add_device() will decide on retries and
+ * return "1" when it should be retried
+ */
+ while (_scsih_add_device(ioc, handle, retry_count++,
+ 1)) {
+ ssleep(1);
+ }
+ printk(MPT2SAS_INFO_FMT "\tAFTER adding phys disk: "
+ " handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(sas_device_pg0.SASAddress));
}
}

+ printk(MPT2SAS_INFO_FMT "\tscan devices: phys disk complete\n",
+ ioc->name);
+
+ printk(MPT2SAS_INFO_FMT "\tscan devices: volumes start\n", ioc->name);
/* volumes */
handle = 0xFFFF;
while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
@@ -7102,6 +7161,13 @@ _scsih_scan_for_devices_after_reset(stru
MPI2_IOCSTATUS_MASK;
if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
break;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from volume scan: "
+ "ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
handle = le16_to_cpu(volume_pg1.DevHandle);
raid_device = _scsih_raid_device_find_by_wwid(ioc,
le64_to_cpu(volume_pg1.WWID));
@@ -7111,18 +7177,38 @@ _scsih_scan_for_devices_after_reset(stru
&volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
sizeof(Mpi2RaidVolPage0_t)))
continue;
+ ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+ MPI2_IOCSTATUS_MASK;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from volume scan: "
+ "ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED) {
memset(&element, 0, sizeof(Mpi2EventIrConfigElement_t));
element.ReasonCode = MPI2_EVENT_IR_CHANGE_RC_ADDED;
element.VolDevHandle = volume_pg1.DevHandle;
+ printk(MPT2SAS_INFO_FMT "\tBEFORE adding volume: "
+ " handle (0x%04x)\n", ioc->name,
+ volume_pg1.DevHandle);
_scsih_sas_volume_add(ioc, &element);
+ printk(MPT2SAS_INFO_FMT "\tAFTER adding volume: "
+ " handle (0x%04x)\n", ioc->name,
+ volume_pg1.DevHandle);
}
}

+ printk(MPT2SAS_INFO_FMT "\tscan devices: volumes complete\n",
+ ioc->name);
+
skip_to_sas:

+ printk(MPT2SAS_INFO_FMT "\tscan devices: end devices start\n",
+ ioc->name);
/* sas devices */
handle = 0xFFFF;
while (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
@@ -7132,6 +7218,13 @@ _scsih_scan_for_devices_after_reset(stru
MPI2_IOCSTATUS_MASK;
if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
break;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_INFO_FMT "\tbreak from end device scan:"
+ " ioc_status(0x%04x), loginfo(0x%08x)\n",
+ ioc->name, ioc_status,
+ le32_to_cpu(mpi_reply.IOCLogInfo));
+ break;
+ }
handle = le16_to_cpu(sas_device_pg0.DevHandle);
if (!(_scsih_is_end_device(
le32_to_cpu(sas_device_pg0.DeviceInfo))))
@@ -7142,12 +7235,31 @@ _scsih_scan_for_devices_after_reset(stru
continue;
parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address)) {
+ printk(MPT2SAS_INFO_FMT "\tBEFORE adding end device: "
+ "handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(sas_device_pg0.SASAddress));
mpt2sas_transport_update_links(ioc, sas_address, handle,
sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
- _scsih_add_device(ioc, handle, 0, 0);
+ retry_count = 0;
+ /* This will retry adding the end device.
+ * _scsih_add_device() will decide on retries and
+ * return "1" when it should be retried
+ */
+ while (_scsih_add_device(ioc, handle, retry_count++,
+ 0)) {
+ ssleep(1);
+ }
+ printk(MPT2SAS_INFO_FMT "\tAFTER adding end device: "
+ "handle (0x%04x), sas_addr(0x%016llx)\n",
+ ioc->name, handle, (unsigned long long)
+ le64_to_cpu(sas_device_pg0.SASAddress));
}
}

+ printk(MPT2SAS_INFO_FMT "\tscan devices: end devices complete\n",
+ ioc->name);
+
printk(MPT2SAS_INFO_FMT "scan devices: complete\n", ioc->name);
}

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Next message: Greg Kroah-Hartman: "[PATCH 3.4 62/88] nfsd: check passed sockets net matches NFSd superblocks one"
Previous message: Greg Kroah-Hartman: "[PATCH 3.4 67/88] iscsi-target: Always send a response before terminating iSCSI connection"
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Next in thread: Greg Kroah-Hartman: "[PATCH 3.4 62/88] nfsd: check passed sockets net matches NFSd superblocks one"
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