mpt2sas: fix non-x86 crash on shutdown

Upstrem commit: 911ae9434f83e7355d343f6c2be3ef5b00ea7aed

There's a bug in the MSIX backup and restore routines that cause a crash on
non-x86 (direct access to PCI space not via read/write).  These routines are
unnecessary and were removed by the above commit, so also remove them from
stable to fix the crash.

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 83035bd1c489545f7bfcec76b1c5b90c1bafcd15..39e81cd567ae993bf780290d00313874fd4c0f88 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1081,41 +1081,6 @@ _base_config_dma_addressing(struct MPT2SAS_ADAPTER *ioc, struct pci_dev *pdev)
        return 0;
 }
 
-/**
- * _base_save_msix_table - backup msix vector table
- * @ioc: per adapter object
- *
- * This address an errata where diag reset clears out the table
- */
-static void
-_base_save_msix_table(struct MPT2SAS_ADAPTER *ioc)
-{
-       int i;
-
-       if (!ioc->msix_enable || ioc->msix_table_backup == NULL)
-               return;
-
-       for (i = 0; i < ioc->msix_vector_count; i++)
-               ioc->msix_table_backup[i] = ioc->msix_table[i];
-}
-
-/**
- * _base_restore_msix_table - this restores the msix vector table
- * @ioc: per adapter object
- *
- */
-static void
-_base_restore_msix_table(struct MPT2SAS_ADAPTER *ioc)
-{
-       int i;
-
-       if (!ioc->msix_enable || ioc->msix_table_backup == NULL)
-               return;
-
-       for (i = 0; i < ioc->msix_vector_count; i++)
-               ioc->msix_table[i] = ioc->msix_table_backup[i];
-}
-
 /**
  * _base_check_enable_msix - checks MSIX capabable.
  * @ioc: per adapter object
@@ -1128,7 +1093,7 @@ _base_check_enable_msix(struct MPT2SAS_ADAPTER *ioc)
 {
        int base;
        u16 message_control;
-       u32 msix_table_offset;
+
 
        base = pci_find_capability(ioc->pdev, PCI_CAP_ID_MSIX);
        if (!base) {
@@ -1141,14 +1106,8 @@ _base_check_enable_msix(struct MPT2SAS_ADAPTER *ioc)
        pci_read_config_word(ioc->pdev, base + 2, &message_control);
        ioc->msix_vector_count = (message_control & 0x3FF) + 1;
 
-       /* get msix table  */
-       pci_read_config_dword(ioc->pdev, base + 4, &msix_table_offset);
-       msix_table_offset &= 0xFFFFFFF8;
-       ioc->msix_table = (u32 *)((void *)ioc->chip + msix_table_offset);
-
        dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "msix is supported, "
-           "vector_count(%d), table_offset(0x%08x), table(%p)\n", ioc->name,
-           ioc->msix_vector_count, msix_table_offset, ioc->msix_table));
+           "vector_count(%d)\n", ioc->name, ioc->msix_vector_count));
        return 0;
 }
 
@@ -1162,8 +1121,6 @@ _base_disable_msix(struct MPT2SAS_ADAPTER *ioc)
 {
        if (ioc->msix_enable) {
                pci_disable_msix(ioc->pdev);
-               kfree(ioc->msix_table_backup);
-               ioc->msix_table_backup = NULL;
                ioc->msix_enable = 0;
        }
 }
@@ -1189,14 +1146,6 @@ _base_enable_msix(struct MPT2SAS_ADAPTER *ioc)
        if (_base_check_enable_msix(ioc) != 0)
                goto try_ioapic;
 
-       ioc->msix_table_backup = kcalloc(ioc->msix_vector_count,
-           sizeof(u32), GFP_KERNEL);
-       if (!ioc->msix_table_backup) {
-               dfailprintk(ioc, printk(MPT2SAS_INFO_FMT "allocation for "
-                   "msix_table_backup failed!!!\n", ioc->name));
-               goto try_ioapic;
-       }
-
        memset(&entries, 0, sizeof(struct msix_entry));
        r = pci_enable_msix(ioc->pdev, &entries, 1);
        if (r) {
@@ -3513,9 +3462,6 @@ _base_diag_reset(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
        u32 hcb_size;
 
        printk(MPT2SAS_INFO_FMT "sending diag reset !!\n", ioc->name);
-
-       _base_save_msix_table(ioc);
-
        drsprintk(ioc, printk(MPT2SAS_INFO_FMT "clear interrupts\n",
            ioc->name));
 
@@ -3611,7 +3557,6 @@ _base_diag_reset(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
                goto out;
        }
 
-       _base_restore_msix_table(ioc);
        printk(MPT2SAS_INFO_FMT "diag reset: SUCCESS\n", ioc->name);
        return 0;
 

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 8d5be2120c63ea7b9f2bcbbf99def8bf44d01c60..7df640fb54dd4df22a0553ad28765e4f3cca9293 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -636,8 +636,6 @@ enum mutex_type {
  * @wait_for_port_enable_to_complete:
  * @msix_enable: flag indicating msix is enabled
  * @msix_vector_count: number msix vectors
- * @msix_table: virt address to the msix table
- * @msix_table_backup: backup msix table
  * @scsi_io_cb_idx: shost generated commands
  * @tm_cb_idx: task management commands
  * @scsih_cb_idx: scsih internal commands
@@ -779,8 +777,6 @@ struct MPT2SAS_ADAPTER {
 
        u8              msix_enable;
        u16             msix_vector_count;
-       u32             *msix_table;
-       u32             *msix_table_backup;
        u32             ioc_reset_count;
 
        /* internal commands, callback index */