Scsi - Index of

1192 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1193 0, us->ifnum, NULL, 0);
1194 }
进入这个函数一看,很简单,也不干别的,就是调用usb_stor_reset_common().于是,咱们接着来到了
这个来自driver/usb/storage/transport.c 中的usb_stor_reset_common()函数.
1101 /* This is the common part of the device reset code.
1102 *
1103 * It's handy that every transport mechanism uses the control endpoint for
1104 * resets.
1105 *
1106 * Basically, we send a reset with a 20-second timeout, so we don't get
1107 * jammed attempting to do the reset.
1108 */
185
1109 static int usb_stor_reset_common(struct us_data *us,
1110 u8 request, u8 requesttype,
1111 u16 value, u16 index, void *data, u16 size)
1112 {
1113 int result;
1114 int result2;
1115 int rc = FAILED;
1116
1117 /* Let the SCSI layer know we are doing a reset, set the
1118 * RESETTING bit, and clear the ABORTING bit so that the reset
1119 * may proceed.
1120 */
1121 scsi_lock(us->host);
1122 usb_stor_report_device_reset(us);
1123 set_bit(US_FLIDX_RESETTING, &us->flags);
1124 clear_bit(US_FLIDX_ABORTING, &us->flags);
1125 scsi_unlock(us->host);
1126
1127 /* A 20-second timeout may seem rather long, but a LaCie
1128 * StudioDrive USB2 device takes 16+ seconds to get going
1129 * following a powerup or USB attach event.
1130 */
1131 result = usb_stor_control_msg(us, us->send_ctrl_pipe,
1132 request, requesttype, value, index, data, size,
1133 20*HZ);
1134 if (result < 0) {
1135 US_DEBUGP("Soft reset failed: %d\n", result);
1136 goto Done;
1137 }
1138