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cxl/region: Fix region commit uninitialized variable warning

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0day robot reports:

drivers/cxl/core/region.c:196 cxl_region_decode_commit() error: uninitialized symbol 'rc'.

The re-checking of loop termination conditions to determine "success"
makes it hard to see that @rc is initialized in all cases. Remove those
to make it explicit that @rc reflects a commit error and that the rest
of logic is concerned with unwinding committed decoders.

This change potentially results in cxl_region_decode_reset() being
called with @count == 0 where it was not called before, but
cxl_region_decode_reset() treats that as a nop.

Fixes: 176baefb2e ("cxl/hdm: Commit decoder state to hardware")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: http://lore.kernel.org/r/165951148105.967013.14191992449932268431.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2022-08-02 14:47:08 -07:00
parent 8d42854257
commit 69c9961387
1 changed files with 13 additions and 17 deletions
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30
drivers/cxl/core/region.c
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@ -159,7 +159,7 @@ static int cxl_region_decode_reset(struct cxl_region *cxlr, int count)
static int cxl_region_decode_commit(struct cxl_region *cxlr)
{
struct cxl_region_params *p = &cxlr->params;
int i, rc;
int i, rc = 0;
for (i = 0; i < p->nr_targets; i++) {
struct cxl_endpoint_decoder *cxled = p->targets[i];
@ -179,27 +179,23 @@ static int cxl_region_decode_commit(struct cxl_region *cxlr)
break;
}
/* success, all decoders up to the root are programmed */
if (is_cxl_root(iter))
continue;
if (rc) {
/* programming @iter failed, teardown */
for (ep = cxl_ep_load(iter, cxlmd); ep && iter;
iter = ep->next, ep = cxl_ep_load(iter, cxlmd)) {
cxl_rr = cxl_rr_load(iter, cxlr);
cxld = cxl_rr->decoder;
cxld->reset(cxld);
}
/* programming @iter failed, teardown */
for (ep = cxl_ep_load(iter, cxlmd); ep && iter;
iter = ep->next, ep = cxl_ep_load(iter, cxlmd)) {
cxl_rr = cxl_rr_load(iter, cxlr);
cxld = cxl_rr->decoder;
cxld->reset(cxld);
cxled->cxld.reset(&cxled->cxld);
goto err;
}
cxled->cxld.reset(&cxled->cxld);
if (i == 0)
return rc;
break;
}
if (i >= p->nr_targets)
return 0;
return 0;
err:
/* undo the targets that were successfully committed */
cxl_region_decode_reset(cxlr, i);
return rc;