linux-kernel - RE: [PATCH] misc: pci_endpoint_test: fix misuse of COMMAND

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Date:   Wed, 29 Dec 2021 10:49:37 +0000
From:   Li Chen <lchen@...arella.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] misc: pci_endpoint_test: fix misuse of COMMAND_READ/WRITE

Sorry, I misunderstood the two functions. pci_endpoint_test_write has fulfilled orig_addr, which is used to dma_map_single. So it ask the device to read from the dma address, and **writes** to its own dma address/buf. 

Pls ignore this patch, thanks.

> -----Original Message-----
> From: Li Chen
> Sent: Wednesday, December 29, 2021 2:07 PM
> To: Kishon Vijay Abraham I; Lorenzo Pieralisi; Krzysztof Wilczyński; Arnd
> Bergmann; Greg Kroah-Hartman; linux-pci@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: [PATCH] misc: pci_endpoint_test: fix misuse of
> COMMAND_READ/WRITE
> 
> IIUC, COMMAND_WRITE should be set for pci_endpoint_test_write,
> and COMMAND_READ should be set for pci_endpoint_test_read.
> 
> Signed-off-by: Li Chen <lchen@...arella.com>
> ---
>  drivers/misc/pci_endpoint_test.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> index 2ed7e3aaff3a8..ea7a90830932d 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -551,12 +551,12 @@ static bool pci_endpoint_test_write(struct
> pci_endpoint_test *test,
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
> irq_type);
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
> -				 COMMAND_READ);
> +				 COMMAND_WRITE);
> 
>  	wait_for_completion(&test->irq_raised);
> 
>  	reg = pci_endpoint_test_readl(test, PCI_ENDPOINT_TEST_STATUS);
> -	if (reg & STATUS_READ_SUCCESS)
> +	if (reg & STATUS_WRITE_SUCCESS)
>  		ret = true;
> 
>  	dma_unmap_single(dev, orig_phys_addr, size + alignment,
> @@ -643,7 +643,7 @@ static bool pci_endpoint_test_read(struct
> pci_endpoint_test *test,
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
> irq_type);
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_NUMBER, 1);
>  	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_COMMAND,
> -				 COMMAND_WRITE);
> +				 COMMAND_READ);
> 
>  	wait_for_completion(&test->irq_raised);
> 
> --
> 2.34.1

Regards,
Li

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