From a9b9e3adc9a98ce59a8544d31da597807a473bd1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 18 Oct 2018 15:05:36 +0200 Subject: [PATCH] scsi: pmcraid: don't allocate a dma coherent buffer for sense data We can just dma map the sense buffer passed with the scsi command, and that gets us out of the nasty business of doing dma coherent allocations from irq context. Signed-off-by: Christoph Hellwig Signed-off-by: Martin K. Petersen --- drivers/scsi/pmcraid.c | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c index 3ba6064..401e543 100644 --- a/drivers/scsi/pmcraid.c +++ b/drivers/scsi/pmcraid.c @@ -846,16 +846,9 @@ static void pmcraid_erp_done(struct pmcraid_cmd *cmd) cmd->ioa_cb->ioarcb.cdb[0], ioasc); } - /* if we had allocated sense buffers for request sense, copy the sense - * release the buffers - */ - if (cmd->sense_buffer != NULL) { - memcpy(scsi_cmd->sense_buffer, - cmd->sense_buffer, - SCSI_SENSE_BUFFERSIZE); - pci_free_consistent(pinstance->pdev, - SCSI_SENSE_BUFFERSIZE, - cmd->sense_buffer, cmd->sense_buffer_dma); + if (cmd->sense_buffer) { + dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma, + SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); cmd->sense_buffer = NULL; cmd->sense_buffer_dma = 0; } @@ -2444,13 +2437,12 @@ static void pmcraid_request_sense(struct pmcraid_cmd *cmd) { struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl; + struct device *dev = &cmd->drv_inst->pdev->dev; - /* allocate DMAable memory for sense buffers */ - cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev, - SCSI_SENSE_BUFFERSIZE, - &cmd->sense_buffer_dma); - - if (cmd->sense_buffer == NULL) { + cmd->sense_buffer = cmd->scsi_cmd->sense_buffer; + cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer, + SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, cmd->sense_buffer_dma)) { pmcraid_err ("couldn't allocate sense buffer for request sense\n"); pmcraid_erp_done(cmd); -- 2.7.4