s390/pci: fix dma address calculation in map_sg

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__s390_dma_map_sg maps a dma-contiguous area. Although we only map
whole pages we have to take into account that the area doesn't start
or stop at a page boundary because we use the dma address to loop
over the individual sg entries. Failing to do that might lead to an
access of the wrong sg entry.

Fixes: ee877b81c6 ("s390/pci_dma: improve map_sg")
Reported-and-tested-by: Christoph Raisch <raisch@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Sebastian Ott 2016-11-07 15:06:03 +01:00 • committed by Martin Schwidefsky

parent 191ce9d1fd

commit 6b7df3ce92

1 changed files with 8 additions and 7 deletions

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arch/s390/pci/pci_dma.c

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