add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/ata/libata-scsi.c
..
..
@@ -2742,17 +2742,35 @@
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 	return 0;
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 }
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-static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
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+static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno)
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 {
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-	if (!sata_pmp_attached(ap)) {
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-		if (likely(devno >= 0 &&
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-			   devno < ata_link_max_devices(&ap->link)))
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+	/*
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+	 * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case),
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+	 * or 2 (IDE master + slave case). However, the former case includes
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+	 * libsas hosted devices which are numbered per scsi host, leading
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+	 * to devno potentially being larger than 0 but with each struct
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+	 * ata_device having its own struct ata_port and struct ata_link.
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+	 * To accommodate these, ignore devno and always use device number 0.
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+	 */
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+	if (likely(!sata_pmp_attached(ap))) {
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+		int link_max_devices = ata_link_max_devices(&ap->link);
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+
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+		if (link_max_devices == 1)
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+			return &ap->link.device[0];
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+
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+		if (devno < link_max_devices)
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 			return &ap->link.device[devno];
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-	} else {
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-		if (likely(devno >= 0 &&
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-			   devno < ap->nr_pmp_links))
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-			return &ap->pmp_link[devno].device[0];
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+
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+		return NULL;
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 	}
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+
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+	/*
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+	 * For PMP-attached devices, the device number corresponds to C
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+	 * (channel) of SCSI [H:C:I:L], indicating the port pmp link
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+	 * for the device.
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+	 */
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+	if (devno < ap->nr_pmp_links)
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+		return &ap->pmp_link[devno].device[0];
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 	return NULL;
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 }
..
..
@@ -4241,7 +4259,7 @@
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 		break;
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 	case MAINTENANCE_IN:
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-		if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
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+		if ((scsicmd[1] & 0x1f) == MI_REPORT_SUPPORTED_OPERATION_CODES)
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 			ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
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 		else
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 			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);