linux-kernel - Re: [PATCH v1] USB: storage: Notify the subdrivers that they need to reinitialize the device.

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Date:   Wed, 29 Nov 2017 10:42:46 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Mikhail Zaytsev <flashed@...l.ru>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>,
        <usb-storage@...ts.one-eyed-alien.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] USB: storage: Notify the subdrivers that they need
 to reinitialize the device.

On Wed, 29 Nov 2017, Mikhail Zaytsev wrote:

> This patch adds the device_reinit function into the us_data structure.
> The usb-storage driver uses this function for notify the subdrivers that
>  they need to reinitialize the device.
> 
> Signed-off-by: Mikhail Zaytsev <flashed@...l.ru>

I'd feel more inclined to accept this patch if the new code got used 
somewhere.  As it is, it fixes a "problem" that doesn't actually have 
any real effect.

Alan Stern


> ---
>  drivers/usb/storage/usb.c | 16 ++++++++--------
>  drivers/usb/storage/usb.h |  8 +++++---
>  2 files changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
> index a0c07e05a8f1..60c47b2e877d 100644
> --- a/drivers/usb/storage/usb.c
> +++ b/drivers/usb/storage/usb.c
> @@ -210,10 +210,10 @@ int usb_stor_reset_resume(struct usb_interface *iface)
>         /* Report the reset to the SCSI core */
>         usb_stor_report_bus_reset(us);
> 
> -	/*
> -	 * FIXME: Notify the subdrivers that they need to reinitialize
> -	 * the device
> -	 */
> +	if (us->device_reinit) {
> +		usb_stor_dbg(us, "-- calling device_reinit()\n");
> +		us->device_reinit(us);
> +	}
>         return 0;
>  }
>  EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
> @@ -242,10 +242,10 @@ int usb_stor_post_reset(struct usb_interface *iface)
>         /* Report the reset to the SCSI core */
>         usb_stor_report_bus_reset(us);
> 
> -	/*
> -	 * FIXME: Notify the subdrivers that they need to reinitialize
> -	 * the device
> -	 */
> +	if (us->device_reinit) {
> +		usb_stor_dbg(us, "-- calling device_reinit()\n");
> +		us->device_reinit(us);
> +	}
> 
>         mutex_unlock(&us->dev_mutex);
>         return 0;
> diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
> index 90133e16bec5..c646a0464a51 100644
> --- a/drivers/usb/storage/usb.h
> +++ b/drivers/usb/storage/usb.h
> @@ -77,9 +77,10 @@ struct us_unusual_dev {
>  #define US_IOBUF_SIZE		64	/* Size of the DMA-mapped I/O buffer */
>  #define US_SENSE_SIZE		18	/* Size of the autosense data buffer */
> 
> -typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
> -typedef int (*trans_reset)(struct us_data*);
> -typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
> +typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data *);
> +typedef int (*trans_reset)(struct us_data *);
> +typedef int (*dev_reinit)(struct us_data *);
> +typedef void (*proto_cmnd)(struct scsi_cmnd *, struct us_data *);
>  typedef void (*extra_data_destructor)(void *);	/* extra data destructor */
>  typedef void (*pm_hook)(struct us_data *, int);	/* power management hook */
> 
> @@ -119,6 +120,7 @@ struct us_data {
>         /* function pointers for this device */
>         trans_cmnd		transport;	 /* transport function	   */
>         trans_reset		transport_reset; /* transport device reset */
> +	dev_reinit		device_reinit;   /* device reinitialize	   */
>         proto_cmnd		proto_handler;	 /* protocol handler	   */
> 
>         /* SCSI interfaces */
> --
> 
>