From: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
[ Upstream commit 17b8d847b92d815d1638f0de154654081d66b281 ]
pci_get_device() will increase the reference count for the returned
pci_dev, so tgl_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 before exiting from __uncore_imc_init_box(). Add
pci_dev_put() for both normal and error path.
Fixes: fdb64822443e ("perf/x86: Add Intel Tiger Lake uncore support")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221118063137.121512-5-wangxiongfeng2@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/x86/events/intel/uncore_snb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index fa9289718147..a4c20e37bec2 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -1274,6 +1274,7 @@ static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
/* MCHBAR is disabled */
if (!(mch_bar & BIT(0))) {
pr_warn("perf uncore: MCHBAR is disabled. Failed to map IMC free-running counters.\n");
+ pci_dev_put(pdev);
return;
}
mch_bar &= ~BIT(0);
@@ -1287,6 +1288,8 @@ static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)
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);
+
+ pci_dev_put(pdev);
}
static struct intel_uncore_ops tgl_uncore_imc_freerunning_ops = {
--
2.35.1
