[PATCH] libata: improve failed qc reporting

	}

	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {

		static const char *dma_str[] = {

			[DMA_BIDIRECTIONAL]	= "bidi",

			[DMA_TO_DEVICE]		= "out",

			[DMA_FROM_DEVICE]	= "in",

			[DMA_NONE]		= "",

		};

		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);

		struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;

		unsigned int nbytes;

		if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)

			continue;

		ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x "

			       "Emask 0x%x stat 0x%x err 0x%x (%s)\n",

			       qc->tag, qc->tf.command, qc->err_mask,

			       qc->result_tf.command, qc->result_tf.feature,

			       ata_err_string(qc->err_mask));

		nbytes = qc->nbytes;

		if (!nbytes)

			nbytes = qc->nsect << 9;

		ata_dev_printk(qc->dev, KERN_ERR,

			"cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "

			"tag %d data %u %s\n         "

			"res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "

			"Emask 0x%x (%s)\n",

			cmd->command, cmd->feature, cmd->nsect,

			cmd->lbal, cmd->lbam, cmd->lbah,

			cmd->hob_feature, cmd->hob_nsect,

			cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,

			cmd->device, qc->tag, nbytes, dma_str[qc->dma_dir],

			res->command, res->feature, res->nsect,

			res->lbal, res->lbam, res->lbah,

			res->hob_feature, res->hob_nsect,

			res->hob_lbal, res->hob_lbam, res->hob_lbah,

			res->device, qc->err_mask, ata_err_string(qc->err_mask));

	}

}