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phy: qcom-qusb2: Fix crash if nvmem cell not specified

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Driver currently crashes due to NULL pointer deference
while updating PHY tune register if nvmem cell is NULL.
Since, fused value for Tune1/2 register is optional,
we'd rather bail out.

Fixes: ca04d9d3e1 ("phy: qcom-qusb2: New driver for QUSB2 PHY on Qcom chips")
Reviewed-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
Cc: stable <stable@vger.kernel.org> # 4.14+
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Manu Gautam 2018-05-03 02:36:10 +05:30 committed by Kishon Vijay Abraham I
parent fdf37e1a1f
commit 0b4555e776
1 changed files with 4 additions and 0 deletions
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4
drivers/phy/qualcomm/phy-qcom-qusb2.c
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@ -315,6 +315,10 @@ static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy)
const struct qusb2_phy_cfg *cfg = qphy->cfg;
u8 *val;
/* efuse register is optional */
if (!qphy->cell)
return;
/*
* Read efuse register having TUNE2/1 parameter's high nibble.
* If efuse register shows value as 0x0, or if we fail to find