From: Stefan Richter Date: Sat, 9 Aug 2008 18:16:24 +0000 (+0200) Subject: ieee1394: sbp2: check for DMA mapping failures X-Git-Tag: v2.6.28-rc1~277^2~13 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=cd8c79f17a878b01f3e83a8efd89da18ccdc7ef3;p=linux-2.6-omap-h63xx.git ieee1394: sbp2: check for DMA mapping failures Signed-off-by: Stefan Richter --- diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c index 7a8119e0c91..0037305f599 100644 --- a/drivers/ieee1394/sbp2.c +++ b/drivers/ieee1394/sbp2.c @@ -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, @@ -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); @@ -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); @@ -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; @@ -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); @@ -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); @@ -1613,11 +1633,13 @@ 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)); @@ -1625,6 +1647,7 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu, 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, @@ -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; }