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ieee1394: sbp2: check for DMA mapping failures
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Stefan Richter committed Oct 15, 2008
1 parent 0a77b17 commit cd8c79f
Showing 1 changed file with 59 additions and 35 deletions.
94 changes: 59 additions & 35 deletions drivers/ieee1394/sbp2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -526,26 +526,41 @@ static void sbp2util_write_doorbell(struct work_struct *work)

static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
struct sbp2_command_info *cmd;
struct device *dmadev = lu->hi->host->device.parent;
int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS;

for (i = 0; i < orbs; i++) {
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
cmd->command_orb_dma = dma_map_single(hi->host->device.parent,
&cmd->command_orb,
sizeof(struct sbp2_command_orb),
DMA_TO_DEVICE);
cmd->sge_dma = dma_map_single(hi->host->device.parent,
&cmd->scatter_gather_element,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);
goto failed_alloc;

cmd->command_orb_dma =
dma_map_single(dmadev, &cmd->command_orb,
sizeof(struct sbp2_command_orb),
DMA_TO_DEVICE);
if (dma_mapping_error(dmadev, cmd->command_orb_dma))
goto failed_orb;

cmd->sge_dma =
dma_map_single(dmadev, &cmd->scatter_gather_element,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);
if (dma_mapping_error(dmadev, cmd->sge_dma))
goto failed_sge;

INIT_LIST_HEAD(&cmd->list);
list_add_tail(&cmd->list, &lu->cmd_orb_completed);
}
return 0;

failed_sge:
dma_unmap_single(dmadev, cmd->command_orb_dma,
sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
failed_orb:
kfree(cmd);
failed_alloc:
return -ENOMEM;
}

static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu,
Expand Down Expand Up @@ -1494,14 +1509,16 @@ static int sbp2_agent_reset(struct sbp2_lu *lu, int wait)
return 0;
}

static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
struct sbp2_fwhost_info *hi,
struct sbp2_command_info *cmd,
unsigned int scsi_use_sg,
struct scatterlist *sg,
u32 orb_direction,
enum dma_data_direction dma_dir)
static int sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
struct sbp2_fwhost_info *hi,
struct sbp2_command_info *cmd,
unsigned int scsi_use_sg,
struct scatterlist *sg,
u32 orb_direction,
enum dma_data_direction dma_dir)
{
struct device *dmadev = hi->host->device.parent;

cmd->dma_dir = dma_dir;
orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
orb->misc |= ORB_SET_DIRECTION(orb_direction);
Expand All @@ -1511,9 +1528,12 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,

cmd->dma_size = sg->length;
cmd->dma_type = CMD_DMA_PAGE;
cmd->cmd_dma = dma_map_page(hi->host->device.parent,
sg_page(sg), sg->offset,
cmd->cmd_dma = dma_map_page(dmadev, sg_page(sg), sg->offset,
cmd->dma_size, cmd->dma_dir);
if (dma_mapping_error(dmadev, cmd->cmd_dma)) {
cmd->cmd_dma = 0;
return -ENOMEM;
}

orb->data_descriptor_lo = cmd->cmd_dma;
orb->misc |= ORB_SET_DATA_SIZE(cmd->dma_size);
Expand All @@ -1523,8 +1543,7 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
&cmd->scatter_gather_element[0];
u32 sg_count, sg_len;
dma_addr_t sg_addr;
int i, count = dma_map_sg(hi->host->device.parent, sg,
scsi_use_sg, dma_dir);
int i, count = dma_map_sg(dmadev, sg, scsi_use_sg, dma_dir);

cmd->dma_size = scsi_use_sg;
cmd->sge_buffer = sg;
Expand All @@ -1533,7 +1552,7 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
orb->data_descriptor_lo = cmd->sge_dma;

dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
dma_sync_single_for_cpu(dmadev, cmd->sge_dma,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);

Expand Down Expand Up @@ -1564,22 +1583,23 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
(sizeof(struct sbp2_unrestricted_page_table)) *
sg_count);

dma_sync_single_for_device(hi->host->device.parent,
cmd->sge_dma,
dma_sync_single_for_device(dmadev, cmd->sge_dma,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);
}
return 0;
}

static void sbp2_create_command_orb(struct sbp2_lu *lu,
struct sbp2_command_info *cmd,
struct scsi_cmnd *SCpnt)
static int sbp2_create_command_orb(struct sbp2_lu *lu,
struct sbp2_command_info *cmd,
struct scsi_cmnd *SCpnt)
{
struct device *dmadev = lu->hi->host->device.parent;
struct sbp2_command_orb *orb = &cmd->command_orb;
u32 orb_direction;
unsigned int scsi_request_bufflen = scsi_bufflen(SCpnt);
enum dma_data_direction dma_dir = SCpnt->sc_data_direction;
u32 orb_direction;
int ret;

dma_sync_single_for_cpu(dmadev, cmd->command_orb_dma,
sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
Expand Down Expand Up @@ -1613,18 +1633,21 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu,
orb->data_descriptor_hi = 0x0;
orb->data_descriptor_lo = 0x0;
orb->misc |= ORB_SET_DIRECTION(1);
} else
sbp2_prep_command_orb_sg(orb, lu->hi, cmd, scsi_sg_count(SCpnt),
scsi_sglist(SCpnt),
orb_direction, dma_dir);

ret = 0;
} else {
ret = sbp2_prep_command_orb_sg(orb, lu->hi, cmd,
scsi_sg_count(SCpnt),
scsi_sglist(SCpnt),
orb_direction, dma_dir);
}
sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb));

memset(orb->cdb, 0, sizeof(orb->cdb));
memcpy(orb->cdb, SCpnt->cmnd, SCpnt->cmd_len);

dma_sync_single_for_device(dmadev, cmd->command_orb_dma,
sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
return ret;
}

static void sbp2_link_orb_command(struct sbp2_lu *lu,
Expand Down Expand Up @@ -1705,9 +1728,10 @@ static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt,
if (!cmd)
return -EIO;

sbp2_create_command_orb(lu, cmd, SCpnt);
sbp2_link_orb_command(lu, cmd);
if (sbp2_create_command_orb(lu, cmd, SCpnt))
return -ENOMEM;

sbp2_link_orb_command(lu, cmd);
return 0;
}

Expand Down

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