diff options
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-core.c | 56 | ||||
| -rw-r--r-- | drivers/ata/libata-scsi.c | 59 |
2 files changed, 57 insertions, 58 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 3587ac3fe3f..def3682f416 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4642,28 +4642,6 @@ int ata_check_atapi_dma(struct ata_queued_cmd *qc) } /** - * atapi_qc_may_overflow - Check whether data transfer may overflow - * @qc: ATA command in question - * - * ATAPI commands which transfer variable length data to host - * might overflow due to application error or hardare bug. This - * function checks whether overflow should be drained and ignored - * for @qc. - * - * LOCKING: - * None. - * - * RETURNS: - * 1 if @qc may overflow; otherwise, 0. - */ -static int atapi_qc_may_overflow(struct ata_queued_cmd *qc) -{ - return ata_is_atapi(qc->tf.protocol) && ata_is_data(qc->tf.protocol) && - atapi_cmd_type(qc->cdb[0]) == ATAPI_MISC && - !(qc->tf.flags & ATA_TFLAG_WRITE); -} - -/** * ata_std_qc_defer - Check whether a qc needs to be deferred * @qc: ATA command in question * @@ -5026,36 +5004,10 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) next_sg: sg = qc->cursg; if (unlikely(!sg)) { - /* - * The end of qc->sg is reached and the device expects - * more data to transfer. In order not to overrun qc->sg - * and fulfill length specified in the byte count register, - * - for read case, discard trailing data from the device - * - for write case, padding zero data to the device - */ - u16 pad_buf[1] = { 0 }; - - if (qc->curbytes + bytes > qc->nbytes + ATAPI_MAX_DRAIN) { - ata_ehi_push_desc(ehi, "too much trailing data " - "buf=%u cur=%u bytes=%u", - qc->nbytes, qc->curbytes, bytes); - return -1; - } - - /* allow overflow only for misc ATAPI commands */ - if (!atapi_qc_may_overflow(qc)) { - ata_ehi_push_desc(ehi, "unexpected trailing data " - "%u bytes", bytes); - return -1; - } - - consumed = 0; - while (consumed < bytes) - consumed += ap->ops->data_xfer(dev, - (unsigned char *)pad_buf, 2, rw); - - qc->curbytes += bytes; - return 0; + ata_ehi_push_desc(ehi, "unexpected or too much trailing data " + "buf=%u cur=%u bytes=%u", + qc->nbytes, qc->curbytes, bytes); + return -1; } page = sg_page(sg); diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 6e15c5ddae6..dd41b1a1b30 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -826,17 +826,56 @@ static void ata_scsi_sdev_config(struct scsi_device *sdev) sdev->max_device_blocked = 1; } -static void ata_scsi_dev_config(struct scsi_device *sdev, - struct ata_device *dev) +/** + * atapi_drain_needed - Check whether data transfer may overflow + * @request: request to be checked + * + * ATAPI commands which transfer variable length data to host + * might overflow due to application error or hardare bug. This + * function checks whether overflow should be drained and ignored + * for @request. + * + * LOCKING: + * None. + * + * RETURNS: + * 1 if ; otherwise, 0. + */ +static int atapi_drain_needed(struct request *rq) +{ + if (likely(!blk_pc_request(rq))) + return 0; + + if (!rq->data_len || (rq->cmd_flags & REQ_RW)) + return 0; + + return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; +} + +static int ata_scsi_dev_config(struct scsi_device *sdev, + struct ata_device *dev) { /* configure max sectors */ blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); - if (dev->class == ATA_DEV_ATAPI) + if (dev->class == ATA_DEV_ATAPI) { + struct request_queue *q = sdev->request_queue; + void *buf; + /* set the min alignment */ blk_queue_update_dma_alignment(sdev->request_queue, ATA_DMA_PAD_SZ - 1); - else { + + /* configure draining */ + buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); + if (!buf) { + ata_dev_printk(dev, KERN_ERR, + "drain buffer allocation failed\n"); + return -ENOMEM; + } + + blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); + } else { /* ATA devices must be sector aligned */ blk_queue_update_dma_alignment(sdev->request_queue, ATA_SECT_SIZE - 1); @@ -853,6 +892,8 @@ static void ata_scsi_dev_config(struct scsi_device *sdev, depth = min(ATA_MAX_QUEUE - 1, depth); scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); } + + return 0; } /** @@ -871,13 +912,14 @@ int ata_scsi_slave_config(struct scsi_device *sdev) { struct ata_port *ap = ata_shost_to_port(sdev->host); struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); + int rc = 0; ata_scsi_sdev_config(sdev); if (dev) - ata_scsi_dev_config(sdev, dev); + rc = ata_scsi_dev_config(sdev, dev); - return 0; + return rc; } /** @@ -897,6 +939,7 @@ int ata_scsi_slave_config(struct scsi_device *sdev) void ata_scsi_slave_destroy(struct scsi_device *sdev) { struct ata_port *ap = ata_shost_to_port(sdev->host); + struct request_queue *q = sdev->request_queue; unsigned long flags; struct ata_device *dev; @@ -912,6 +955,10 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev) ata_port_schedule_eh(ap); } spin_unlock_irqrestore(ap->lock, flags); + + kfree(q->dma_drain_buffer); + q->dma_drain_buffer = NULL; + q->dma_drain_size = 0; } /** |