linux-kernel - [PATCH 5.10 050/717] spi: spi-mem: fix reference leak in spi_mem_access

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Date:   Mon, 28 Dec 2020 13:40:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhang Qilong <zhangqilong3@...wei.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 050/717] spi: spi-mem: fix reference leak in spi_mem_access_start

From: Zhang Qilong <zhangqilong3@...wei.com>

[ Upstream commit c02bb16b0e826bf0e19aa42c3ae60ea339f32cf5 ]

pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to pm_runtime_put_noidle will result in
reference leak in spi_mem_access_start, so we should fix it.

Fixes: f86c24f479530 ("spi: spi-mem: Split spi_mem_exec_op() code")
Signed-off-by: Zhang Qilong <zhangqilong3@...wei.com>
Link: https://lore.kernel.org/r/20201103140910.3482-1-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-mem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index ef53290b7d24d..4682f49dc7330 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -243,6 +243,7 @@ static int spi_mem_access_start(struct spi_mem *mem)
 
 		ret = pm_runtime_get_sync(ctlr->dev.parent);
 		if (ret < 0) {
+			pm_runtime_put_noidle(ctlr->dev.parent);
 			dev_err(&ctlr->dev, "Failed to power device: %d\n",
 				ret);
 			return ret;
-- 
2.27.0