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cxl/hdm: Fail upon detecting 0-sized decoders 

commit 7701c8bef4 upstream.

Decoders committed with 0-size lead to later crashes on shutdown as
__cxl_dpa_release() assumes a 'struct resource' has been established in
the in 'cxlds->dpa_res'. Just fail the driver load in this instance
since there are deeper problems with the enumeration or the setup when
this happens.

Fixes: 9c57cde0dc ("cxl/hdm: Enumerate allocated DPA")
Cc: <stable@vger.kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/168149843516.792294.11872242648319572632.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Williams 2023-04-14 11:53:55 -07:00 committed by Greg Kroah-Hartman
parent 2d4d75789b
commit 08420e96b4
1 changed files with 12 additions and 3 deletions
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15
drivers/cxl/core/hdm.c
View File

@ -219,8 +219,11 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
lockdep_assert_held_write(&cxl_dpa_rwsem);
if (!len)
goto success;
if (!len) {
dev_warn(dev, "decoder%d.%d: empty reservation attempted\n",
port->id, cxled->cxld.id);
return -EINVAL;
}
if (cxled->dpa_res) {
dev_dbg(dev, "decoder%d.%d: existing allocation %pr assigned\n",
@ -273,7 +276,6 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
cxled->mode = CXL_DECODER_MIXED;
}
success:
port->hdm_end++;
get_device(&cxled->cxld.dev);
return 0;
@ -732,6 +734,13 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
port->id, cxld->id);
return -ENXIO;
}
if (size == 0) {
dev_warn(&port->dev,
"decoder%d.%d: Committed with zero size\n",
port->id, cxld->id);
return -ENXIO;
}
port->commit_end = cxld->id;
} else {
/* unless / until type-2 drivers arrive, assume type-3 */