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[PATCH] cciss: fix for DMA brokeness 

The CCISS driver seems to loose track of DMA mappings created by it's
fill_cmd() routine.  Neither callers of this routine are extracting the DMA
address created in order to do the unmap.

Instead, they simply try to unmap 0x0.  It's easy to see this problem on an
x86_64 system when using the "swiotlb=force" boot option.  In this case, the
driver is leaking resources of the swiotlb and not causing a sync of the
bounce buffer.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Miller 2005-09-13 01:25:24 -07:00 committed by Linus Torvalds
parent 6a445d3ba6
commit bb2a37bf41
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/block/cciss.c
View File

@ -1730,8 +1730,10 @@ case CMD_HARDWARE_ERR:
}
}
/* unlock the buffers from DMA */
buff_dma_handle.val32.lower = c->SG[0].Addr.lower;
buff_dma_handle.val32.upper = c->SG[0].Addr.upper;
pci_unmap_single( h->pdev, (dma_addr_t) buff_dma_handle.val,
size, PCI_DMA_BIDIRECTIONAL);
c->SG[0].Len, PCI_DMA_BIDIRECTIONAL);
cmd_free(h, c, 0);
return(return_status);
@ -2011,8 +2013,10 @@ resend_cmd1:
cleanup1:
/* unlock the data buffer from DMA */
buff_dma_handle.val32.lower = c->SG[0].Addr.lower;
buff_dma_handle.val32.upper = c->SG[0].Addr.upper;
pci_unmap_single(info_p->pdev, (dma_addr_t) buff_dma_handle.val,
size, PCI_DMA_BIDIRECTIONAL);
c->SG[0].Len, PCI_DMA_BIDIRECTIONAL);
cmd_free(info_p, c, 1);
return (status);
}