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Date: Mon, 22 Jan 2024 14:02:48 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Cc: dlemoal@...nel.org, richardcochran@...il.com, piyush.mehta@...inx.com,
axboe@...nel.dk, michal.simek@....com, linux-ide@...r.kernel.org,
linux-kernel@...r.kernel.org, git@....com,
Piyush Mehta <piyush.mehta@....com>
Subject: Re: [PATCH 1/2] ata: ahci_ceva: fix error handling for Xilinx GT PHY
support
Hello Radhey,
On Fri, Jan 19, 2024 at 12:38:23AM +0530, Radhey Shyam Pandey wrote:
> From: Piyush Mehta <piyush.mehta@....com>
>
> Platform clock and phy error resources are not cleaned up in Xilinx GT PHY
> error path. To fix introduce error label for ahci_platform_disable_clks and
> phy_power_off/exit and call them in error path. No functional change.
>
> Fixes: 9a9d3abe24bb ("ata: ahci: ceva: Update the driver to support xilinx GT phy")
> Signed-off-by: Piyush Mehta <piyush.mehta@....com>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> ---
> ---
> drivers/ata/ahci_ceva.c | 47 +++++++++++++++++++++++++++++------------
> 1 file changed, 33 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/ata/ahci_ceva.c b/drivers/ata/ahci_ceva.c
> index 64f7f7d6ba84..bfc513f1d0b3 100644
> --- a/drivers/ata/ahci_ceva.c
> +++ b/drivers/ata/ahci_ceva.c
> @@ -196,7 +196,7 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> struct ahci_host_priv *hpriv;
> struct ceva_ahci_priv *cevapriv;
> enum dev_dma_attr attr;
> - int rc;
> + int rc, i;
>
> cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL);
> if (!cevapriv)
> @@ -219,8 +219,6 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> if (rc)
> return rc;
> } else {
> - int i;
> -
> rc = ahci_platform_enable_clks(hpriv);
> if (rc)
> return rc;
> @@ -229,8 +227,11 @@ static int ceva_ahci_probe(struct platform_device *pdev)
>
> for (i = 0; i < hpriv->nports; i++) {
> rc = phy_init(hpriv->phys[i]);
> - if (rc)
> - return rc;
> + if (rc) {
> + while (--i >= 0)
> + phy_exit(hpriv->phys[i]);
It is ugly to have a loop both here and at the end of the function.
Why don't you just goto disable_phys here?
Just like how it is done in ahci_platform_enable_phys():
https://github.com/torvalds/linux/blob/v6.7/drivers/ata/libahci_platform.c#L52-L54
> + goto disable_clks;
> + }
> }
>
> /* De-assert the controller reset */
> @@ -240,7 +241,7 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> rc = phy_power_on(hpriv->phys[i]);
> if (rc) {
> phy_exit(hpriv->phys[i]);
> - return rc;
> + goto disable_phys;
> }
> }
> }
> @@ -252,52 +253,60 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> if (of_property_read_u8_array(np, "ceva,p0-cominit-params",
> (u8 *)&cevapriv->pp2c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-cominit-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-cominit-params",
> (u8 *)&cevapriv->pp2c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-cominit-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> /* Read OOB timing value for COMWAKE from device-tree*/
> if (of_property_read_u8_array(np, "ceva,p0-comwake-params",
> (u8 *)&cevapriv->pp3c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-comwake-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-comwake-params",
> (u8 *)&cevapriv->pp3c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-comwake-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> /* Read phy BURST timing value from device-tree */
> if (of_property_read_u8_array(np, "ceva,p0-burst-params",
> (u8 *)&cevapriv->pp4c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-burst-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-burst-params",
> (u8 *)&cevapriv->pp4c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-burst-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> /* Read phy RETRY interval timing value from device-tree */
> if (of_property_read_u16_array(np, "ceva,p0-retry-params",
> (u16 *)&cevapriv->pp5c[0], 2) < 0) {
> dev_warn(dev, "ceva,p0-retry-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> if (of_property_read_u16_array(np, "ceva,p1-retry-params",
> (u16 *)&cevapriv->pp5c[1], 2) < 0) {
> dev_warn(dev, "ceva,p1-retry-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_phys;
> }
>
> /*
> @@ -321,6 +330,16 @@ static int ceva_ahci_probe(struct platform_device *pdev)
>
> disable_resources:
> ahci_platform_disable_resources(hpriv);
Looking at ahci_platform_disable_resources(),
it calls ahci_platform_disable_phys(), which calls
phy_power_off() and phy_exit().
This means that if you jump to disable_resources,
you will call phy_power_off() and phy_exit() twice.
Looking at the phy code, it does not handle these functions being called
twice.
You already call ahci_platform_get_resources(), so why don't you just set
AHCI_PLATFORM_GET_RESETS, that way you should be able to remove a bunch of
duplicated code from this driver.
One major difference seems to be that ahci_platform_enable_resources() does
not assert reset before deasserting it.
Can't we just add a reset_control_assert() + some small usleep
(e.g. usleep_range(1000, 1500)) before the reset_control_deassert()?
Have you tried doing that?
Kind regards,
Niklas
> +
> +disable_phys:
> + while (--i >= 0) {
> + phy_power_off(hpriv->phys[i]);
> + phy_exit(hpriv->phys[i]);
> + }
> +
> +disable_clks:
> + ahci_platform_disable_clks(hpriv);
> +
> return rc;
> }
>
> --
> 2.34.1
>
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