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util/vfio-helpers: Simplify qemu_vfio_dma_map() returning directly 

To simplify qemu_vfio_dma_map():
- reduce 'ret' (returned value) scope by returning errno directly,
- remove the goto 'out' label.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210902070025.197072-10-philmd@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2021-09-02 09:00:23 +02:00 committed by Stefan Hajnoczi
parent 453095e98d
commit 5a4f1626e3
1 changed files with 10 additions and 13 deletions
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23
util/vfio-helpers.c
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@ -748,7 +748,6 @@ static bool qemu_vfio_water_mark_reached(QEMUVFIOState *s, size_t size,
int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
bool temporary, uint64_t *iova, Error **errp)
{
int ret = 0;
int index;
IOVAMapping *mapping;
uint64_t iova0;
@ -761,32 +760,31 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
if (mapping) {
iova0 = mapping->iova + ((uint8_t *)host - (uint8_t *)mapping->host);
} else {
int ret;
if (qemu_vfio_water_mark_reached(s, size, errp)) {
ret = -ENOMEM;
goto out;
return -ENOMEM;
}
if (!temporary) {
if (!qemu_vfio_find_fixed_iova(s, size, &iova0, errp)) {
ret = -ENOMEM;
goto out;
return -ENOMEM;
}
mapping = qemu_vfio_add_mapping(s, host, size, index + 1, iova0);
assert(qemu_vfio_verify_mappings(s));
ret = qemu_vfio_do_mapping(s, host, size, iova0);
if (ret) {
if (ret < 0) {
qemu_vfio_undo_mapping(s, mapping, NULL);
goto out;
return ret;
}
qemu_vfio_dump_mappings(s);
} else {
if (!qemu_vfio_find_temp_iova(s, size, &iova0, errp)) {
ret = -ENOMEM;
goto out;
return -ENOMEM;
}
ret = qemu_vfio_do_mapping(s, host, size, iova0);
if (ret) {
goto out;
if (ret < 0) {
return ret;
}
}
}
@ -794,8 +792,7 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size,
if (iova) {
*iova = iova0;
}
out:
return ret;
return 0;
}
/* Reset the high watermark and free all "temporary" mappings. */