[SCSI] mpt2sas: fix config request and diag reset deadlock

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>

1 files changed, 20 insertions, 65 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_config.c b/drivers/scsi/mpt2sas/mpt2sas_config.c
index 1c6658c60239..6ddee161beb3 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -236,12 +236,14 @@ _config_request(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigRequest_t
         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 *ioc, Mpi2ConfigRequest_t
                         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 *ioc, Mpi2ConfigRequest_t
         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, Mpi2ConfigRequest_t
                     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 *ioc, Mpi2ConfigRequest_t
         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(struct MPT2SAS_ADAPTER *ioc,
         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(struct MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc,
         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 MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc,
         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 MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc,
         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 MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc,
         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 MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc,
         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 MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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(struct MPT2SAS_ADAPTER *ioc, u8 *num_phys)
         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(struct MPT2SAS_ADAPTER *ioc, u8 *num_phys)
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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(struct MPT2SAS_ADAPTER *ioc,
         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(struct MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc, u16 handle,
         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 MPT2SAS_ADAPTER *ioc, u16 handle,
                 _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(struct MPT2SAS_ADAPTER *ioc,
         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(struct MPT2SAS_ADAPTER *ioc,
                 _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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
         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 MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
                 _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 MPT2SAS_ADAPTER *ioc, u16 pd_handle,
         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 MPT2SAS_ADAPTER *ioc, u16 pd_handle,
                 _config_free_config_dma_memory(ioc, &mem);
 
  out:
-        mutex_unlock(&ioc->config_cmds.mutex);
         return r;
 }