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Message-ID: <20120104192102.GB18214@kroah.com>
Date: Wed, 4 Jan 2012 11:21:02 -0800
From: Greg KH <greg@...ah.com>
To: James Bottomley <James.Bottomley@...senPartnership.com>,
"David S. Miller" <davem@...emloft.net>
Cc: "Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@....com>,
"stable@...r.kernel.org" <stable@...r.kernel.org>,
Greg KH <gregkh@...e.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"Moore, Eric" <Eric.Moore@....com>
Subject: Re: [PATCH] mpt2sas: fix non-x86 crash on shutdown
On Wed, Jan 04, 2012 at 09:25:13AM -0600, James Bottomley wrote:
> From: "nagalakshmi.nandigama@....com" <nagalakshmi.nandigama@....com>
That's not a correct "from" line, sorry. That would create a mess of
the log. Oh, I see Linus's tree is already a mess here, ugh. Please be
more careful when accepting patches, otherwise stuff like this causes me
to have to hand-edit the kernel git logs when I run the "who does what"
statistic reports...
David, any objection for me taking this patch (left below) instead of
your original one for the stable tree?
thanks,
greg k-h
> 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@....com>
> Signed-off-by: James Bottomley <JBottomley@...allels.com>
>
> diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
> index 83035bd..39e81cd 100644
> --- a/drivers/scsi/mpt2sas/mpt2sas_base.c
> +++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
> @@ -1082,41 +1082,6 @@ _base_config_dma_addressing(struct MPT2SAS_ADAPTER *ioc, struct pci_dev *pdev)
> }
>
> /**
> - * _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 8d5be21..7df640f 100644
> --- 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 */
>
>
> --
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