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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-24 12:58:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-24 12:58:43 -0800
commit08da5a32b7789289f48f3037b64df2945b5dafc2 (patch)
treecc55fc18248cb6f1fd745c3d5530591810c83203 /Documentation
parenteda4b716ea1f2a647a39cebae66b3fae4c4b80e4 (diff)
parent29687512c0b084957112cc2c0743ce34cd0d5055 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6: [SCSI] fix up documentation for change in ->queuecommand to lockless calling [SCSI] bfa: rename log_level to bfa_log_level
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/scsi/scsi_mid_low_api.txt59
1 files changed, 31 insertions, 28 deletions
diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index 570ef2b3d79..df322c10346 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -1044,9 +1044,9 @@ Details:
/**
- * queuecommand - queue scsi command, invoke 'done' on completion
+ * queuecommand - queue scsi command, invoke scp->scsi_done on completion
+ * @shost: pointer to the scsi host object
* @scp: pointer to scsi command object
- * @done: function pointer to be invoked on completion
*
* Returns 0 on success.
*
@@ -1074,42 +1074,45 @@ Details:
*
* Other types of errors that are detected immediately may be
* flagged by setting scp->result to an appropriate value,
- * invoking the 'done' callback, and then returning 0 from this
- * function. If the command is not performed immediately (and the
- * LLD is starting (or will start) the given command) then this
- * function should place 0 in scp->result and return 0.
+ * invoking the scp->scsi_done callback, and then returning 0
+ * from this function. If the command is not performed
+ * immediately (and the LLD is starting (or will start) the given
+ * command) then this function should place 0 in scp->result and
+ * return 0.
*
* Command ownership. If the driver returns zero, it owns the
- * command and must take responsibility for ensuring the 'done'
- * callback is executed. Note: the driver may call done before
- * returning zero, but after it has called done, it may not
- * return any value other than zero. If the driver makes a
- * non-zero return, it must not execute the command's done
- * callback at any time.
- *
- * Locks: struct Scsi_Host::host_lock held on entry (with "irqsave")
- * and is expected to be held on return.
+ * command and must take responsibility for ensuring the
+ * scp->scsi_done callback is executed. Note: the driver may
+ * call scp->scsi_done before returning zero, but after it has
+ * called scp->scsi_done, it may not return any value other than
+ * zero. If the driver makes a non-zero return, it must not
+ * execute the command's scsi_done callback at any time.
+ *
+ * Locks: up to and including 2.6.36, struct Scsi_Host::host_lock
+ * held on entry (with "irqsave") and is expected to be
+ * held on return. From 2.6.37 onwards, queuecommand is
+ * called without any locks held.
*
* Calling context: in interrupt (soft irq) or process context
*
- * Notes: This function should be relatively fast. Normally it will
- * not wait for IO to complete. Hence the 'done' callback is invoked
- * (often directly from an interrupt service routine) some time after
- * this function has returned. In some cases (e.g. pseudo adapter
- * drivers that manufacture the response to a SCSI INQUIRY)
- * the 'done' callback may be invoked before this function returns.
- * If the 'done' callback is not invoked within a certain period
- * the SCSI mid level will commence error processing.
- * If a status of CHECK CONDITION is placed in "result" when the
- * 'done' callback is invoked, then the LLD driver should
- * perform autosense and fill in the struct scsi_cmnd::sense_buffer
+ * Notes: This function should be relatively fast. Normally it
+ * will not wait for IO to complete. Hence the scp->scsi_done
+ * callback is invoked (often directly from an interrupt service
+ * routine) some time after this function has returned. In some
+ * cases (e.g. pseudo adapter drivers that manufacture the
+ * response to a SCSI INQUIRY) the scp->scsi_done callback may be
+ * invoked before this function returns. If the scp->scsi_done
+ * callback is not invoked within a certain period the SCSI mid
+ * level will commence error processing. If a status of CHECK
+ * CONDITION is placed in "result" when the scp->scsi_done
+ * callback is invoked, then the LLD driver should perform
+ * autosense and fill in the struct scsi_cmnd::sense_buffer
* array. The scsi_cmnd::sense_buffer array is zeroed prior to
* the mid level queuing a command to an LLD.
*
* Defined in: LLD
**/
- int queuecommand(struct scsi_cmnd * scp,
- void (*done)(struct scsi_cmnd *))
+ int queuecommand(struct Scsi_Host *shost, struct scsi_cmnd * scp)
/**