linux-kernel - Re: [PATCH] mailbox: mailbox-test: avoid reading iomem twice

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Date:	Wed, 4 Nov 2015 08:16:50 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	jaswinder.singh@...aro.org
Cc:	linux-kernel@...r.kernel.org, sfr@...b.auug.org.au
Subject: Re: [PATCH] mailbox: mailbox-test: avoid reading iomem twice

On Wed, 04 Nov 2015, jaswinder.singh@...aro.org wrote:

> From: Jassi Brar <jaswinder.singh@...aro.org>
> 
> Don't pass mmio region as source to print_hex_dump() and then
> again to memcpy_fromio(). Do it once and give print_hex_dump()
> the buffer we just read the data in.
> 
> Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
> ---
>  drivers/mailbox/mailbox-test.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Nice fix Jassi.

Acked-by: Lee Jones <lee.jones@...aro.org>

> diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
> index f82dc89..684ae17 100644
> --- a/drivers/mailbox/mailbox-test.c
> +++ b/drivers/mailbox/mailbox-test.c
> @@ -221,11 +221,10 @@ static void mbox_test_receive_message(struct mbox_client *client, void *message)
>  
>  	spin_lock_irqsave(&tdev->lock, flags);
>  	if (tdev->mmio) {
> +		memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
>  		print_hex_dump(KERN_INFO, "Client: Received [MMIO]: ",
>  			       DUMP_PREFIX_ADDRESS, MBOX_BYTES_PER_LINE, 1,
> -			       __io_virt(tdev->mmio), MBOX_MAX_MSG_LEN, true);
> -		memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
> -
> +			       tdev->rx_buffer, MBOX_MAX_MSG_LEN, true);
>  	} else if (message) {
>  		print_hex_dump(KERN_INFO, "Client: Received [API]: ",
>  			       DUMP_PREFIX_ADDRESS, MBOX_BYTES_PER_LINE, 1,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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