[PATCH 5.14 170/849] cxl/pci: Fix NULL vs ERR_PTR confusion

Greg Kroah-Hartman
2021-11-15T22:03:59Z

From: Dan Williams <dan.j.williams@intel.com>

commit ca76a3a8052b71c0334d5c094859cfa340c290a8 upstream.

cxl_pci_map_regblock() may return an ERR_PTR(), but cxl_pci_setup_regs()
is only prepared for NULL as the error case. Pick the minimal fix for
-stable backport purposes and just have cxl_pci_map_regblock() return
NULL for errors.

Fixes: f8a7e8c29be8 ("cxl/pci: Reserve all device regions at once")
Cc: <stable@vger.kernel.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163433325724.834522.17809774578178224149.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/cxl/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -970,7 +970,7 @@ static void __iomem *cxl_mem_map_regbloc
if (pci_resource_len(pdev, bar) < offset) {
dev_err(dev, "BAR%d: %pr: too small (offset: %#llx)\n", bar,
&pdev->resource[bar], (unsigned long long)offset);
- return IOMEM_ERR_PTR(-ENXIO);
+ return NULL;
}

addr = pci_iomap(pdev, bar, 0);