xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
[ 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: 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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiongfeng Wang
2022-11-18 14:31:37 +08:00
committed by Greg Kroah-Hartman
parent d2afced511
commit 0afcb759f6
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/events/intel/uncore_snb.c
View File

@@ -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 = {