perf/x86/intel/uncore: Fix reference count leak in hswep_has_limit_sbox()

pci_get_device() will increase the reference count for the returned
'dev'. We need to call pci_dev_put() to decrease the reference count.
Since 'dev' is only used in pci_read_config_dword(), let's add
pci_dev_put() right after it.

Fixes: 9d480158ee86 ("perf/x86/intel/uncore: Remove uncore extra PCI dev HSWEP_PCI_PCU_3")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20221118063137.121512-3-wangxiongfeng2@huawei.com

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index b14d5918351689cea0a5857cd7a388ac99cae93b..93b0f1f4d0d1124ab041d86cc0882ae53ede3406 100644 (file)
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -2910,6 +2910,7 @@ static bool hswep_has_limit_sbox(unsigned int device)
                return false;
 
        pci_read_config_dword(dev, HSWEP_PCU_CAPID4_OFFET, &capid4);
+       pci_dev_put(dev);
        if (!hswep_get_chop(capid4))
                return true;