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PCI: endpoint: pci-epf-test: Make use of cached 'epc_features' in pci_epf_test_core_init()

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BugLink: https://bugs.launchpad.net/bugs/2083196

[ Upstream commit 5a5095a8bd1bd349cce1c879e5e44407a34dda8a ]

Instead of getting the epc_features from pci_epc_get_features() API, use
the cached pci_epf_test::epc_features value to avoid the NULL check. Since
the NULL check is already performed in pci_epf_test_bind(), having one more
check in pci_epf_test_core_init() is redundant and it is not possible to
hit the NULL pointer dereference.

Also with commit a01e7214bef9 ("PCI: endpoint: Remove "core_init_notifier"
flag"), 'epc_features' got dereferenced without the NULL check, leading to
the following false positive Smatch warning:

  drivers/pci/endpoint/functions/pci-epf-test.c:784 pci_epf_test_core_init() error: we previously assumed 'epc_features' could be null (see line 747)

Thus, remove the redundant NULL check and also use the epc_features::
{msix_capable/msi_capable} flags directly to avoid local variables.

[kwilczynski: commit log]
Fixes: 5e50ee27d4 ("PCI: pci-epf-test: Add support to defer core initialization")
Closes: https://lore.kernel.org/linux-pci/024b5826-7180-4076-ae08-57d2584cca3f@moroto.mountain
Link: https://lore.kernel.org/linux-pci/20240418-pci-epf-test-fix-v2-1-eacd54831444@linaro.org
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Manivannan Sadhasivam
2024-04-18 13:29:58 +05:30
committed by Mehmet Basaran
parent 07bf47fc32
commit 7ea4d9ade5
1 changed files with 3 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/pci/endpoint/functions/pci-epf-test.c
+3 -11
View File
@@ -750,19 +750,11 @@ static int pci_epf_test_core_init(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
struct pci_epf_header *header = epf->header;
const struct pci_epc_features *epc_features;
const struct pci_epc_features *epc_features = epf_test->epc_features;
struct pci_epc *epc = epf->epc;
struct device *dev = &epf->dev;
bool msix_capable = false;
bool msi_capable = true;
int ret;
epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
if (epc_features) {
msix_capable = epc_features->msix_capable;
msi_capable = epc_features->msi_capable;
}
if (epf->vfunc_no <= 1) {
ret = pci_epc_write_header(epc, epf->func_no, epf->vfunc_no, header);
if (ret) {
@@ -775,7 +767,7 @@ static int pci_epf_test_core_init(struct pci_epf *epf)
if (ret)
return ret;
if (msi_capable) {
if (epc_features->msi_capable) {
ret = pci_epc_set_msi(epc, epf->func_no, epf->vfunc_no,
epf->msi_interrupts);
if (ret) {
@@ -784,7 +776,7 @@ static int pci_epf_test_core_init(struct pci_epf *epf)
}
}
if (msix_capable) {
if (epc_features->msix_capable) {
ret = pci_epc_set_msix(epc, epf->func_no, epf->vfunc_no,
epf->msix_interrupts,
epf_test->test_reg_bar,