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From: Alim Akhtar <alim.akhtar@samsung.com>
To: linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org
Cc: krzysztof.kozlowski+dt@linaro.org, vkoul@kernel.org,
	chanho61.park@samsung.com, pankaj.dubey@samsung.com,
	Alim Akhtar <alim.akhtar@samsung.com>
Subject: [PATCH -next] phy: samsung-ufs: fix NULL pointer dereference
Date: Fri, 10 Jun 2022 12:35:47 +0530	[thread overview]
Message-ID: <20220610070547.71193-1-alim.akhtar@samsung.com> (raw)
In-Reply-To: CGME20220610070811epcas5p3c62ef9ad9c82092deac59ff9be896677@epcas5p3.samsung.com

commit f86c1d0a58b1f63a ("phy: samsung: ufs: remove drvdata from struct
samsung_ufs_phy")

removes _drvdata_ initialization which resulting in NULL pointer
dereferencing in samsung_ufs_phy_wait_for_lock_acq(). Fix this by
initializing drvdata.

The said commit also duplicate "has_symbol_clk" both in drvdata struct
and in samsung_ufs_phy struct, let's go back and use only one
"has_symbol_clk".

Fixes: f86c1d0a58b1 phy: samsung: ufs: remove drvdata from struct samsung_ufs_phy
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/phy/samsung/phy-samsung-ufs.c | 6 +++---
 drivers/phy/samsung/phy-samsung-ufs.h | 1 -
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/samsung/phy-samsung-ufs.c b/drivers/phy/samsung/phy-samsung-ufs.c
index 206a79c69a6c..6708877b20d7 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.c
+++ b/drivers/phy/samsung/phy-samsung-ufs.c
@@ -207,7 +207,7 @@ static int samsung_ufs_phy_init(struct phy *phy)
 	ss_phy->lane_cnt = phy->attrs.bus_width;
 	ss_phy->ufs_phy_state = CFG_PRE_INIT;
 
-	if (ss_phy->has_symbol_clk) {
+	if (ss_phy->drvdata->has_symbol_clk) {
 		ret = samsung_ufs_phy_symbol_clk_init(ss_phy);
 		if (ret)
 			dev_err(ss_phy->dev, "failed to set ufs phy symbol clocks\n");
@@ -259,7 +259,7 @@ static int samsung_ufs_phy_exit(struct phy *phy)
 
 	clk_disable_unprepare(ss_phy->ref_clk);
 
-	if (ss_phy->has_symbol_clk) {
+	if (ss_phy->drvdata->has_symbol_clk) {
 		clk_disable_unprepare(ss_phy->tx0_symbol_clk);
 		clk_disable_unprepare(ss_phy->rx0_symbol_clk);
 		clk_disable_unprepare(ss_phy->rx1_symbol_clk);
@@ -327,8 +327,8 @@ static int samsung_ufs_phy_probe(struct platform_device *pdev)
 
 	drvdata = match->data;
 	phy->dev = dev;
+	phy->drvdata = drvdata;
 	phy->cfgs = drvdata->cfgs;
-	phy->has_symbol_clk = drvdata->has_symbol_clk;
 	memcpy(&phy->isol, &drvdata->isol, sizeof(phy->isol));
 
 	if (!of_property_read_u32_index(dev->of_node, "samsung,pmu-syscon", 1,
diff --git a/drivers/phy/samsung/phy-samsung-ufs.h b/drivers/phy/samsung/phy-samsung-ufs.h
index 854b53bdf347..b9144586daf5 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.h
+++ b/drivers/phy/samsung/phy-samsung-ufs.h
@@ -125,7 +125,6 @@ struct samsung_ufs_phy {
 	const struct samsung_ufs_phy_drvdata *drvdata;
 	const struct samsung_ufs_phy_cfg * const *cfgs;
 	struct samsung_ufs_phy_pmu_isol isol;
-	bool has_symbol_clk;
 	u8 lane_cnt;
 	int ufs_phy_state;
 	enum phy_mode mode;

base-commit: ff539ac73ea559a8c146d99ab14bfcaddd30547a
-- 
2.25.1


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       reply	other threads:[~2022-06-10  7:08 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220610070811epcas5p3c62ef9ad9c82092deac59ff9be896677@epcas5p3.samsung.com>
2022-06-10  7:05 ` Alim Akhtar [this message]
2022-06-10  8:15   ` [PATCH -next] phy: samsung-ufs: fix NULL pointer dereference Chanho Park
2022-06-10  9:16     ` Alim Akhtar
2022-06-10  9:15   ` Alim Akhtar

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