mmc: sdhci-of-esdhc: Fix refcount leak in esdhc_signal_voltage_switch

[ Upstream commit b5899a3e2f783a27b268e38d37f9b24c71bddf45 ]

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.
of_node_put() checks null pointer.

Fixes: ea35645a3c66 ("mmc: sdhci-of-esdhc: add support for signal voltage switch")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220523144255.10310-1-linmq006@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 0f3658b..04a37fd 100644 (file)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -904,6 +904,7 @@ static int esdhc_signal_voltage_switch(struct mmc_host *mmc,
                scfg_node = of_find_matching_node(NULL, scfg_device_ids);
                if (scfg_node)
                        scfg_base = of_iomap(scfg_node, 0);
+               of_node_put(scfg_node);
                if (scfg_base) {
                        sdhciovselcr = SDHCIOVSELCR_TGLEN |
                                       SDHCIOVSELCR_VSELVAL;