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

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: fdb6482244 ("perf/x86: Add Intel Tiger Lake uncore support")
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/20221118063137.121512-5-wangxiongfeng2@huawei.com
This commit is contained in:
Xiongfeng Wang 2022-11-18 14:31:37 +08:00 committed by Peter Zijlstra
parent 8ebd16c11c
commit 17b8d847b9
1 changed files with 3 additions and 0 deletions
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3
arch/x86/events/intel/uncore_snb.c
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@ -1338,6 +1338,7 @@ static void __uncore_imc_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);
@ -1352,6 +1353,8 @@ static void __uncore_imc_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 void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box)