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scsi: megaraid_mbox: remove bogus use of pci_dma_sync_sg_* APIs

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The dma_map_sg / dma_unmap_sg APIs called from scsi_dma_map /
scsi_dma_unmap already transfer memory ownership to the device or cpu
respectively.  Adding additional calls to pci_dma_sync_sg_* will in fact
lead to data corruption if we end up using swiotlb for some reason.

Also remove the now pointless megaraid_mbox_sync_scb function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-10-11 09:15:35 +02:00 committed by Martin K. Petersen
parent ca2ade2415
commit 67d98f0a83
1 changed files with 1 additions and 34 deletions
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35
drivers/scsi/megaraid/megaraid_mbox.c
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@ -1428,12 +1428,6 @@ mbox_post_cmd(adapter_t *adapter, scb_t *scb)
adapter->outstanding_cmds++;
if (scb->dma_direction == PCI_DMA_TODEVICE)
pci_dma_sync_sg_for_device(adapter->pdev,
scsi_sglist(scb->scp),
scsi_sg_count(scb->scp),
PCI_DMA_TODEVICE);
mbox->busy = 1; // Set busy
mbox->poll = 0;
mbox->ack = 0;
@ -2180,31 +2174,6 @@ megaraid_isr(int irq, void *devp)
}
/**
* megaraid_mbox_sync_scb - sync kernel buffers
* @adapter : controller's soft state
* @scb : pointer to the resource packet
*
* DMA sync if required.
*/
static void
megaraid_mbox_sync_scb(adapter_t *adapter, scb_t *scb)
{
mbox_ccb_t *ccb;
ccb = (mbox_ccb_t *)scb->ccb;
if (scb->dma_direction == PCI_DMA_FROMDEVICE)
pci_dma_sync_sg_for_cpu(adapter->pdev,
scsi_sglist(scb->scp),
scsi_sg_count(scb->scp),
PCI_DMA_FROMDEVICE);
scsi_dma_unmap(scb->scp);
return;
}
/**
* megaraid_mbox_dpc - the tasklet to complete the commands from completed list
* @devp : pointer to HBA soft state
@ -2403,9 +2372,7 @@ megaraid_mbox_dpc(unsigned long devp)
megaraid_mbox_display_scb(adapter, scb);
}
// Free our internal resources and call the mid-layer callback
// routine
megaraid_mbox_sync_scb(adapter, scb);
scsi_dma_unmap(scp);
// remove from local clist
list_del_init(&scb->list);