RE: [PATCH] mfd: Fix usbhs_enable error handling

From: Keshava Munegowda
Date: Tue Mar 29 2011 - 06:35:53 EST


> -----Original Message-----
> From: Axel Lin [mailto:axel.lin@xxxxxxxxx]
> Sent: Tuesday, March 29, 2011 3:38 PM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Keshava Munegowda; Samuel Ortiz
> Subject: [PATCH] mfd: Fix usbhs_enable error handling
>
> In the case of missing platform_data we do not hold a spin_lock,
> thus we should not call spin_unlock_irqrestore in the error path.
>
> Also simplify the error handling by separating the successful path
> from error path. I think this change improves readability.
>
> Signed-off-by: Axel Lin <axel.lin@xxxxxxxxx>
> ---
> drivers/mfd/omap-usb-host.c | 8 +++-----
> 1 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index cb01209..4157d76 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -700,8 +700,7 @@ static int usbhs_enable(struct device *dev)
> dev_dbg(dev, "starting TI HSUSB Controller\n");
> if (!pdata) {
> dev_dbg(dev, "missing platform_data\n");
> - ret = -ENODEV;
> - goto end_enable;
> + return -ENODEV;
> }
>
> spin_lock_irqsave(&omap->lock, flags);
> @@ -915,7 +914,8 @@ static int usbhs_enable(struct device *dev)
>
> end_count:
> omap->count++;
> - goto end_enable;
> + spin_unlock_irqrestore(&omap->lock, flags);
> + return 0;
>
> err_tll:
> if (pdata->ehci_data->phy_reset) {
> @@ -931,8 +931,6 @@ err_tll:
> clk_disable(omap->usbhost_fs_fck);
> clk_disable(omap->usbhost_hs_fck);
> clk_disable(omap->usbhost_ick);
> -
> -end_enable:
> spin_unlock_irqrestore(&omap->lock, flags);
> return ret;
> }
> --
> 1.7.1

Thanks Axel!
Acked-by: Keshava Munegowda < keshava_mgowda@xxxxxx>

>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/