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-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 570ef2b3d79b..df322c103466 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -1044,9 +1044,9 @@ Details:
1044 1044
1045 1045
1046/** 1046/**
1047 * queuecommand - queue scsi command, invoke 'done' on completion 1047 * queuecommand - queue scsi command, invoke scp->scsi_done on completion
1048 * @shost: pointer to the scsi host object
1048 * @scp: pointer to scsi command object 1049 * @scp: pointer to scsi command object
1049 * @done: function pointer to be invoked on completion
1050 * 1050 *
1051 * Returns 0 on success. 1051 * Returns 0 on success.
1052 * 1052 *
@@ -1074,42 +1074,45 @@ Details:
1074 * 1074 *
1075 * Other types of errors that are detected immediately may be 1075 * Other types of errors that are detected immediately may be
1076 * flagged by setting scp->result to an appropriate value, 1076 * flagged by setting scp->result to an appropriate value,
1077 * invoking the 'done' callback, and then returning 0 from this 1077 * invoking the scp->scsi_done callback, and then returning 0
1078 * function. If the command is not performed immediately (and the 1078 * from this function. If the command is not performed
1079 * LLD is starting (or will start) the given command) then this 1079 * immediately (and the LLD is starting (or will start) the given
1080 * function should place 0 in scp->result and return 0. 1080 * command) then this function should place 0 in scp->result and
1081 * return 0.
1081 * 1082 *
1082 * Command ownership. If the driver returns zero, it owns the 1083 * Command ownership. If the driver returns zero, it owns the
1083 * command and must take responsibility for ensuring the 'done' 1084 * command and must take responsibility for ensuring the
1084 * callback is executed. Note: the driver may call done before 1085 * scp->scsi_done callback is executed. Note: the driver may
1085 * returning zero, but after it has called done, it may not 1086 * call scp->scsi_done before returning zero, but after it has
1086 * return any value other than zero. If the driver makes a 1087 * called scp->scsi_done, it may not return any value other than
1087 * non-zero return, it must not execute the command's done 1088 * zero. If the driver makes a non-zero return, it must not
1088 * callback at any time. 1089 * execute the command's scsi_done callback at any time.
1089 * 1090 *
1090 * Locks: struct Scsi_Host::host_lock held on entry (with "irqsave") 1091 * Locks: up to and including 2.6.36, struct Scsi_Host::host_lock
1091 * and is expected to be held on return. 1092 * held on entry (with "irqsave") and is expected to be
1093 * held on return. From 2.6.37 onwards, queuecommand is
1094 * called without any locks held.
1092 * 1095 *
1093 * Calling context: in interrupt (soft irq) or process context 1096 * Calling context: in interrupt (soft irq) or process context
1094 * 1097 *
1095 * Notes: This function should be relatively fast. Normally it will 1098 * Notes: This function should be relatively fast. Normally it
1096 * not wait for IO to complete. Hence the 'done' callback is invoked 1099 * will not wait for IO to complete. Hence the scp->scsi_done
1097 * (often directly from an interrupt service routine) some time after 1100 * callback is invoked (often directly from an interrupt service
1098 * this function has returned. In some cases (e.g. pseudo adapter 1101 * routine) some time after this function has returned. In some
1099 * drivers that manufacture the response to a SCSI INQUIRY) 1102 * cases (e.g. pseudo adapter drivers that manufacture the
1100 * the 'done' callback may be invoked before this function returns. 1103 * response to a SCSI INQUIRY) the scp->scsi_done callback may be
1101 * If the 'done' callback is not invoked within a certain period 1104 * invoked before this function returns. If the scp->scsi_done
1102 * the SCSI mid level will commence error processing. 1105 * callback is not invoked within a certain period the SCSI mid
1103 * If a status of CHECK CONDITION is placed in "result" when the 1106 * level will commence error processing. If a status of CHECK
1104 * 'done' callback is invoked, then the LLD driver should 1107 * CONDITION is placed in "result" when the scp->scsi_done
1105 * perform autosense and fill in the struct scsi_cmnd::sense_buffer 1108 * callback is invoked, then the LLD driver should perform
1109 * autosense and fill in the struct scsi_cmnd::sense_buffer
1106 * array. The scsi_cmnd::sense_buffer array is zeroed prior to 1110 * array. The scsi_cmnd::sense_buffer array is zeroed prior to
1107 * the mid level queuing a command to an LLD. 1111 * the mid level queuing a command to an LLD.
1108 * 1112 *
1109 * Defined in: LLD 1113 * Defined in: LLD
1110 **/ 1114 **/
1111 int queuecommand(struct scsi_cmnd * scp, 1115 int queuecommand(struct Scsi_Host *shost, struct scsi_cmnd * scp)
1112 void (*done)(struct scsi_cmnd *))
1113 1116
1114 1117
1115/** 1118/**