| Message ID | 20220422130941.2044-3-johan+linaro@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | phy: qcom-qmp: fix leaks on probe errors | expand |
Hi Johan, On Fr, 2022-04-22 at 15:09 +0200, Johan Hovold wrote: > Make sure to release the lane reset controller in case of a late probe > error (e.g. probe deferral). Right. grepping for "of_reset_control_get", there seem to be are a few other drivers that might share the same issue... > Note that due to the reset controller being defined in devicetree in > (questionable) "lane" child nodes, devm_reset_control_get_exclusive() > cannot be used (and we shouldn't add devres helpers for the legacy reset > controller API). Do you mean of_reset_control_get()? Maybe you could switch to of_reset_control_get_exclusive() while at it? That one might warrant a devres helper if other drivers were to adopt the same pattern. The patch itself looks fine to me, Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> regards Philipp
On Mon, Apr 25, 2022 at 11:45:29AM +0200, Philipp Zabel wrote: > Hi Johan, > > On Fr, 2022-04-22 at 15:09 +0200, Johan Hovold wrote: > > Make sure to release the lane reset controller in case of a late probe > > error (e.g. probe deferral). > > Right. grepping for "of_reset_control_get", there seem to be are a few > other drivers that might share the same issue... Yeah, I'm sure there are more of these. > > Note that due to the reset controller being defined in devicetree in > > (questionable) "lane" child nodes, devm_reset_control_get_exclusive() > > cannot be used (and we shouldn't add devres helpers for the legacy reset > > controller API). > > Do you mean of_reset_control_get()? Maybe you could switch to > of_reset_control_get_exclusive() while at it? Right, I was referring to of_reset_control_get() but obviously of_reset_control_get_exclusive() could still get a devres version so that sentence in parenthesis doesn't make much sense. I must have mistakingly imagined that the latter also retrieved the struct device_node from a struct device like the current devres helpers do. > That one might warrant a devres helper if other drivers were to adopt > the same pattern. Right. > The patch itself looks fine to me, > > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Thanks for reviewing. I'll send a v2 with an updated commit message and switch to the new API in a new follow-on patch. Johan
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c index a84f7d1fc9b7..3f77830921f5 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c @@ -6005,6 +6005,11 @@ static const struct phy_ops qcom_qmp_pcie_ufs_ops = { .owner = THIS_MODULE, }; +static void qcom_qmp_reset_control_put(void *data) +{ + reset_control_put(data); +} + static int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id, void __iomem *serdes, const struct qmp_phy_cfg *cfg) @@ -6099,6 +6104,10 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id, dev_err(dev, "failed to get lane%d reset\n", id); return PTR_ERR(qphy->lane_rst); } + ret = devm_add_action_or_reset(dev, qcom_qmp_reset_control_put, + qphy->lane_rst); + if (ret) + return ret; } if (cfg->type == PHY_TYPE_UFS || cfg->type == PHY_TYPE_PCIE)
Make sure to release the lane reset controller in case of a late probe error (e.g. probe deferral). Note that due to the reset controller being defined in devicetree in (questionable) "lane" child nodes, devm_reset_control_get_exclusive() cannot be used (and we shouldn't add devres helpers for the legacy reset controller API). Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets") Cc: stable@vger.kernel.org # 4.12 Cc: Vivek Gautam <vivek.gautam@codeaurora.org> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> --- drivers/phy/qualcomm/phy-qcom-qmp.c | 9 +++++++++ 1 file changed, 9 insertions(+)