On 11/18/2010 12:19 AM, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
>
> This patch converts the mpt2sas driver to run in host_lock less mode
> with the new IRQ_DISABLE_SCSI_QCMD() that disables interrupts while
> calling ->queuecommand() dispatch
>
> Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
> ---
> drivers/scsi/mpt2sas/mpt2sas_scsih.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
> index 1a96a00..e564fe7 100644
> --- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
> +++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
> @@ -3304,7 +3304,7 @@ _scsih_eedp_error_handling(struct scsi_cmnd *scmd, u16 ioc_status)
> }
>
> /**
> - * _scsih_qcmd - main scsi request entry point
> + * _scsih_qcmd_irq_disable - main scsi request entry point
> * @scmd: pointer to scsi command object
> * @done: function pointer to be invoked on completion
> *
> @@ -3315,7 +3315,7 @@ _scsih_eedp_error_handling(struct scsi_cmnd *scmd, u16 ioc_status)
> * SCSI_MLQUEUE_HOST_BUSY if the entire host queue is full
> */
> static int
> -_scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
> +_scsih_qcmd_irq_disable(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
> {
> struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
> struct MPT2SAS_DEVICE *sas_device_priv_data;
> @@ -3441,7 +3441,7 @@ _scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
> return SCSI_MLQUEUE_HOST_BUSY;
> }
>
> -static DEF_SCSI_QCMD(_scsih_qcmd)
> +static IRQ_DISABLE_SCSI_QCMD(_scsih_qcmd)
>
How can this (and other in the patchset) can be correct? I mean I expect
that if you remove the lock,xx_qcmd_lck,unlock then inside the xx_qcmd_lck
there was an unlock,do123,lock and that driver was effectively running lockless
before. (like in iscsi). But here this is new behaviour. If it is correct
I would like to see a statement from you that:
"I have audited this driver, and all shared resources are protected by
XYZ so ..."
Otherwise how can I know this is correct? I have never audited this driver myself
Thanks
Boaz
> /**
> * _scsih_normalize_sense - normalize descriptor and fixed format sense data
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