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

[ Upstream commit 8ebd16c11c346751b3944d708e6c181ed4746c39 ]

pci_get_device() will increase the reference count for the returned
pci_dev, so snr_uncore_get_mc_dev() will return a pci_dev with its
reference count increased. We need to call pci_dev_put() to decrease the
reference count. Let's add the missing pci_dev_put().

Fixes: ee49532b38dd ("perf/x86/intel/uncore: Add IMC uncore support for Snow Ridge")
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/20221118063137.121512-4-wangxiongfeng2@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index f5d89d0..fcd95e9 100644 (file)
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -4860,6 +4860,8 @@ static int snr_uncore_mmio_map(struct intel_uncore_box *box,
 
        addr += box_ctl;
 
+       pci_dev_put(pdev);
+
        box->io_addr = ioremap(addr, type->mmio_map_size);
        if (!box->io_addr) {
                pr_warn("perf uncore: Failed to ioremap for %s.\n", type->name);