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vme: tsi148: fix first DMA item mapping

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This moves DMA mapping of the first list element to vme_list_add, the
same place where other elements mappings occur. This prevents extra
mapping or over-unmapping in the cases when vme_list_exec is called more
or less than one time respectively.

Also adds dma_mapping_error check.

Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Cc: Igor Alekseev <igor.alekseev@itep.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Kalinkin 2015-05-28 15:07:00 +03:00 committed by Greg Kroah-Hartman
parent f656eaee63
commit b2383c90a9
1 changed files with 12 additions and 11 deletions
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23
drivers/vme/bridges/vme_tsi148.c
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@ -1833,17 +1833,21 @@ static int tsi148_dma_list_add(struct vme_dma_list *list,
/* Add to list */
list_add_tail(&entry->list, &list->entries);
entry->dma_handle = dma_map_single(tsi148_bridge->parent,
&entry->descriptor,
sizeof(struct tsi148_dma_descriptor), DMA_TO_DEVICE);
if (dma_mapping_error(tsi148_bridge->parent, entry->dma_handle)) {
dev_err(tsi148_bridge->parent, "DMA mapping error\n");
retval = -EINVAL;
goto err_dma;
}
/* Fill out previous descriptors "Next Address" */
if (entry->list.prev != &list->entries) {
prev = list_entry(entry->list.prev, struct tsi148_dma_entry,
list);
/* We need the bus address for the pointer */
entry->dma_handle = dma_map_single(tsi148_bridge->parent,
&entry->descriptor,
sizeof(struct tsi148_dma_descriptor), DMA_TO_DEVICE);
reg_split((unsigned long long)entry->dma_handle, &address_high,
&address_low);
prev = list_entry(entry->list.prev, struct tsi148_dma_entry,
list);
prev->descriptor.dnlau = cpu_to_be32(address_high);
prev->descriptor.dnlal = cpu_to_be32(address_low);
@ -1851,6 +1855,7 @@ static int tsi148_dma_list_add(struct vme_dma_list *list,
return 0;
err_dma:
err_dest:
err_source:
err_align:
@ -1921,10 +1926,6 @@ static int tsi148_dma_list_exec(struct vme_dma_list *list)
entry = list_first_entry(&list->entries, struct tsi148_dma_entry,
list);
entry->dma_handle = dma_map_single(tsi148_bridge->parent,
&entry->descriptor,
sizeof(struct tsi148_dma_descriptor), DMA_TO_DEVICE);
mutex_unlock(&ctrlr->mtx);
reg_split(entry->dma_handle, &bus_addr_high, &bus_addr_low);