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Subject[patch 45/71] [SCSI] mpt2sas: fix config request and diag reset deadlock
2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Kashyap, Desai <kashyap.desai@lsi.com>

commit 388ce4beb7135722c584b0af18f215e3ec657adf upstream.

Moving the setting and clearing of the mutex's to
_config_request. There was a mutex deadlock when diag reset is called from
inside _config_request, so diag reset was moved to outside the mutexs.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: Eric Moore <Eric.moore@lsi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/scsi/mpt2sas/mpt2sas_config.c | 85 ++++++++--------------------------
1 file changed, 20 insertions(+), 65 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -236,12 +236,14 @@ _config_request(struct MPT2SAS_ADAPTER *
Mpi2ConfigRequest_t *config_request;
int r;
u8 retry_count;
- u8 issue_reset;
+ u8 issue_host_reset = 0;
u16 wait_state_count;

+ mutex_lock(&ioc->config_cmds.mutex);
if (ioc->config_cmds.status != MPT2_CMD_NOT_USED) {
printk(MPT2SAS_ERR_FMT "%s: config_cmd in use\n",
ioc->name, __func__);
+ mutex_unlock(&ioc->config_cmds.mutex);
return -EAGAIN;
}
retry_count = 0;
@@ -260,8 +262,8 @@ _config_request(struct MPT2SAS_ADAPTER *
printk(MPT2SAS_ERR_FMT
"%s: failed due to ioc not operational\n",
ioc->name, __func__);
- ioc->config_cmds.status = MPT2_CMD_NOT_USED;
- return -EFAULT;
+ r = -EFAULT;
+ goto out;
}
ssleep(1);
ioc_state = mpt2sas_base_get_iocstate(ioc, 1);
@@ -277,8 +279,8 @@ _config_request(struct MPT2SAS_ADAPTER *
if (!smid) {
printk(MPT2SAS_ERR_FMT "%s: failed obtaining a smid\n",
ioc->name, __func__);
- ioc->config_cmds.status = MPT2_CMD_NOT_USED;
- return -EAGAIN;
+ r = -EAGAIN;
+ goto out;
}

r = 0;
@@ -298,9 +300,15 @@ _config_request(struct MPT2SAS_ADAPTER *
ioc->name, __func__);
_debug_dump_mf(mpi_request,
sizeof(Mpi2ConfigRequest_t)/4);
- if (!(ioc->config_cmds.status & MPT2_CMD_RESET))
- issue_reset = 1;
- goto issue_host_reset;
+ retry_count++;
+ if (ioc->config_cmds.smid == smid)
+ mpt2sas_base_free_smid(ioc, smid);
+ if ((ioc->shost_recovery) ||
+ (ioc->config_cmds.status & MPT2_CMD_RESET))
+ goto retry_config;
+ issue_host_reset = 1;
+ r = -EFAULT;
+ goto out;
}
if (ioc->config_cmds.status & MPT2_CMD_REPLY_VALID)
memcpy(mpi_reply, ioc->config_cmds.reply,
@@ -308,21 +316,13 @@ _config_request(struct MPT2SAS_ADAPTER *
if (retry_count)
printk(MPT2SAS_INFO_FMT "%s: retry completed!!\n",
ioc->name, __func__);
+out:
ioc->config_cmds.status = MPT2_CMD_NOT_USED;
- return r;
-
- issue_host_reset:
- if (issue_reset)
+ mutex_unlock(&ioc->config_cmds.mutex);
+ if (issue_host_reset)
mpt2sas_base_hard_reset_handler(ioc, CAN_SLEEP,
FORCE_BIG_HAMMER);
- ioc->config_cmds.status = MPT2_CMD_NOT_USED;
- if (!retry_count) {
- printk(MPT2SAS_INFO_FMT "%s: attempting retry\n",
- ioc->name, __func__);
- retry_count++;
- goto retry_config;
- }
- return -EFAULT;
+ return r;
}

/**
@@ -381,7 +381,6 @@ mpt2sas_config_get_manufacturing_pg0(str
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2ManufacturingPage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -423,7 +422,6 @@ mpt2sas_config_get_manufacturing_pg0(str
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -444,7 +442,6 @@ mpt2sas_config_get_bios_pg2(struct MPT2S
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2BiosPage2_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -486,7 +483,6 @@ mpt2sas_config_get_bios_pg2(struct MPT2S
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -507,7 +503,6 @@ mpt2sas_config_get_bios_pg3(struct MPT2S
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2BiosPage3_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -549,7 +544,6 @@ mpt2sas_config_get_bios_pg3(struct MPT2S
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -570,7 +564,6 @@ mpt2sas_config_get_iounit_pg0(struct MPT
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2IOUnitPage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -612,7 +605,6 @@ mpt2sas_config_get_iounit_pg0(struct MPT
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -633,7 +625,6 @@ mpt2sas_config_get_iounit_pg1(struct MPT
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2IOUnitPage1_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -675,7 +666,6 @@ mpt2sas_config_get_iounit_pg1(struct MPT
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -696,7 +686,6 @@ mpt2sas_config_set_iounit_pg1(struct MPT
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_HEADER;
@@ -738,7 +727,6 @@ mpt2sas_config_set_iounit_pg1(struct MPT
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -759,7 +747,6 @@ mpt2sas_config_get_ioc_pg8(struct MPT2SA
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2IOCPage8_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -801,7 +788,6 @@ mpt2sas_config_get_ioc_pg8(struct MPT2SA
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -824,7 +810,6 @@ mpt2sas_config_get_sas_device_pg0(struct
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2SasDevicePage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -869,7 +854,6 @@ mpt2sas_config_get_sas_device_pg0(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -892,7 +876,6 @@ mpt2sas_config_get_sas_device_pg1(struct
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2SasDevicePage1_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -937,7 +920,6 @@ mpt2sas_config_get_sas_device_pg1(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -959,7 +941,6 @@ mpt2sas_config_get_number_hba_phys(struc
Mpi2ConfigReply_t mpi_reply;
Mpi2SasIOUnitPage0_t config_page;

- mutex_lock(&ioc->config_cmds.mutex);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_HEADER;
@@ -1008,7 +989,6 @@ mpt2sas_config_get_number_hba_phys(struc
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1032,8 +1012,6 @@ mpt2sas_config_get_sas_iounit_pg0(struct
Mpi2ConfigRequest_t mpi_request;
int r;
struct config_request mem;
-
- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sz);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1076,7 +1054,6 @@ mpt2sas_config_get_sas_iounit_pg0(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1101,7 +1078,6 @@ mpt2sas_config_get_sas_iounit_pg1(struct
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sz);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1144,7 +1120,6 @@ mpt2sas_config_get_sas_iounit_pg1(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1167,7 +1142,6 @@ mpt2sas_config_get_expander_pg0(struct M
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2ExpanderPage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1212,7 +1186,6 @@ mpt2sas_config_get_expander_pg0(struct M
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1236,7 +1209,6 @@ mpt2sas_config_get_expander_pg1(struct M
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2ExpanderPage1_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1283,7 +1255,6 @@ mpt2sas_config_get_expander_pg1(struct M
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1306,7 +1277,6 @@ mpt2sas_config_get_enclosure_pg0(struct
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2SasEnclosurePage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1351,7 +1321,6 @@ mpt2sas_config_get_enclosure_pg0(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1373,7 +1342,6 @@ mpt2sas_config_get_phy_pg0(struct MPT2SA
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2SasPhyPage0_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1419,7 +1387,6 @@ mpt2sas_config_get_phy_pg0(struct MPT2SA
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1441,7 +1408,6 @@ mpt2sas_config_get_phy_pg1(struct MPT2SA
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2SasPhyPage1_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1487,7 +1453,6 @@ mpt2sas_config_get_phy_pg1(struct MPT2SA
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1511,7 +1476,6 @@ mpt2sas_config_get_raid_volume_pg1(struc
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(config_page, 0, sizeof(Mpi2RaidVolPage1_t));
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1554,7 +1518,6 @@ mpt2sas_config_get_raid_volume_pg1(struc
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1578,7 +1541,6 @@ mpt2sas_config_get_number_pds(struct MPT
struct config_request mem;
u16 ioc_status;

- mutex_lock(&ioc->config_cmds.mutex);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
*num_pds = 0;
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1626,7 +1588,6 @@ mpt2sas_config_get_number_pds(struct MPT
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1651,7 +1612,6 @@ mpt2sas_config_get_raid_volume_pg0(struc
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
memset(config_page, 0, sz);
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1693,7 +1653,6 @@ mpt2sas_config_get_raid_volume_pg0(struc
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1717,7 +1676,6 @@ mpt2sas_config_get_phys_disk_pg0(struct
int r;
struct config_request mem;

- mutex_lock(&ioc->config_cmds.mutex);
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
memset(config_page, 0, sizeof(Mpi2RaidPhysDiskPage0_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1760,7 +1718,6 @@ mpt2sas_config_get_phys_disk_pg0(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}

@@ -1784,7 +1741,6 @@ mpt2sas_config_get_volume_handle(struct
struct config_request mem;
u16 ioc_status;

- mutex_lock(&ioc->config_cmds.mutex);
*volume_handle = 0;
memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
mpi_request.Function = MPI2_FUNCTION_CONFIG;
@@ -1848,7 +1804,6 @@ mpt2sas_config_get_volume_handle(struct
_config_free_config_dma_memory(ioc, &mem);

out:
- mutex_unlock(&ioc->config_cmds.mutex);
return r;
}




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