From ed8a72d108bd951909b28fa4a89aad6489f414e1 Mon Sep 17 00:00:00 2001 From: Jeff Skirvin Date: Thu, 31 Mar 2011 13:10:40 -0700 Subject: [PATCH] isci: Qualify when the host lock is managed for STP/SATA callbacks. In the case of internal discovery related STP/SATA I/O started through sas_execute_task the host lock is not taken by libsas before calling lldd_execute_task, so the lock should not be managed before calling back to libsas through task->task_done or sas_task_abort. Signed-off-by: Jeff Skirvin Signed-off-by: Dan Williams --- drivers/scsi/isci/request.c | 20 ++++---------------- drivers/scsi/isci/sata.c | 1 - drivers/scsi/isci/task.c | 29 +++++++++-------------------- drivers/scsi/isci/task.h | 37 +++++++++++++++++++++++++++++++++++++ 4 files changed, 50 insertions(+), 37 deletions(-) diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c index 946caaeb66c6..b519373597a5 100644 --- a/drivers/scsi/isci/request.c +++ b/drivers/scsi/isci/request.c @@ -53,7 +53,6 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ -#include #include "isci.h" #include "scic_remote_device.h" #include "scic_io_request.h" @@ -452,22 +451,11 @@ int isci_request_execute( task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; spin_unlock_irqrestore(&task->task_state_lock, flags); - /* Cause this task to be scheduled in the SCSI error handler - * thread. + /* Cause this task to be scheduled in the SCSI error + * handler thread. */ - if (dev_is_sata(task->dev)) { - /* Since we are still in the submit path, and since - * libsas takes the host lock on behalf of SATA - * devices before I/O starts, we need to unlock - * before we can put the task in the error path. - */ - raw_local_irq_save(flags); - spin_unlock(isci_host->shost->host_lock); - sas_task_abort(task); - spin_lock(isci_host->shost->host_lock); - raw_local_irq_restore(flags); - } else - sas_task_abort(task); + isci_execpath_callback(isci_host, task, + sas_task_abort); /* Change the status, since we are holding * the I/O until it is managed by the SCSI diff --git a/drivers/scsi/isci/sata.c b/drivers/scsi/isci/sata.c index 794ab7ca9f1a..c941d9090b8d 100644 --- a/drivers/scsi/isci/sata.c +++ b/drivers/scsi/isci/sata.c @@ -299,7 +299,6 @@ int isci_task_send_lu_reset_sata( { struct isci_tmf tmf; int ret = TMF_RESP_FUNC_FAILED; - unsigned long flags; /* Send the soft reset to the target */ #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */ diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c index 338f08ec4d8e..5bcea60fd8c4 100644 --- a/drivers/scsi/isci/task.c +++ b/drivers/scsi/isci/task.c @@ -55,7 +55,6 @@ #include #include -#include #include "scic_task_request.h" #include "scic_remote_device.h" #include "scic_io_request.h" @@ -93,26 +92,13 @@ static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task, case isci_perform_normal_io_completion: /* Normal notification (task_done) */ dev_dbg(&ihost->pdev->dev, - "%s: Normal - task = %p, response=%d, status=%d\n", + "%s: Normal - task = %p, response=%d, " + "status=%d\n", __func__, task, response, status); task->lldd_task = NULL; - if (dev_is_sata(task->dev)) { - /* Since we are still in the submit path, and since - * libsas takes the host lock on behalf of SATA - * devices before I/O starts, we need to unlock - * before we can call back and report the I/O - * submission error. - */ - unsigned long flags; - raw_local_irq_save(flags); - spin_unlock(ihost->shost->host_lock); - task->task_done(task); - spin_lock(ihost->shost->host_lock); - raw_local_irq_restore(flags); - } else - task->task_done(task); + isci_execpath_callback(ihost, task, task->task_done); break; case isci_perform_aborted_io_completion: @@ -120,16 +106,19 @@ static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task, * abort path. */ dev_warn(&ihost->pdev->dev, - "%s: Aborted - task = %p, response=%d, status=%d\n", + "%s: Aborted - task = %p, response=%d, " + "status=%d\n", __func__, task, response, status); break; case isci_perform_error_io_completion: /* Use sas_task_abort */ dev_warn(&ihost->pdev->dev, - "%s: Error - task = %p, response=%d, status=%d\n", + "%s: Error - task = %p, response=%d, " + "status=%d\n", __func__, task, response, status); - sas_task_abort(task); + + isci_execpath_callback(ihost, task, sas_task_abort); break; default: diff --git a/drivers/scsi/isci/task.h b/drivers/scsi/isci/task.h index d7cb6fe268c4..c5afd1cfbde7 100644 --- a/drivers/scsi/isci/task.h +++ b/drivers/scsi/isci/task.h @@ -56,6 +56,8 @@ #if !defined(_ISCI_TASK_H_) #define _ISCI_TASK_H_ +#include + struct isci_request; struct isci_host; @@ -332,5 +334,40 @@ isci_task_set_completion_status( return task_notification_selection; } +/** +* isci_execpath_callback() - This function is called from the task +* execute path when the task needs to callback libsas about the submit-time +* task failure. The callback occurs either through the task's done function +* or through sas_task_abort. In the case of regular non-discovery SATA/STP I/O +* requests, libsas takes the host lock before calling execute task. Therefore +* in this situation the host lock must be managed before calling the func. +* +* @ihost: This parameter is the controller to which the I/O request was sent. +* @task: This parameter is the I/O request. +* @func: This parameter is the function to call in the correct context. +* @status: This parameter is the status code for the completed task. +* +*/ +static inline void isci_execpath_callback( + struct isci_host *ihost, + struct sas_task *task, + void (*func)(struct sas_task *)) +{ + unsigned long flags; + + if (dev_is_sata(task->dev) && task->uldd_task) { + /* Since we are still in the submit path, and since + * libsas takes the host lock on behalf of SATA + * devices before I/O starts (in the non-discovery case), + * we need to unlock before we can call the callback function. + */ + raw_local_irq_save(flags); + spin_unlock(ihost->shost->host_lock); + func(task); + spin_lock(ihost->shost->host_lock); + raw_local_irq_restore(flags); + } else + func(task); +} #endif /* !defined(_SCI_TASK_H_) */