linux-kernel - Re: [PATCH v2 2/4] misc: pci_endpoint_test: Fix the return value of IOCTL

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Message-ID: <20241211074757.byc5jqpgfe3otjh7@thinkpad>
Date: Wed, 11 Dec 2024 13:17:57 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: kw@...ux.com, gregkh@...uxfoundation.org, arnd@...db.de,
	lpieralisi@...nel.org, shuah@...nel.org, kishon@...nel.org,
	aman1.gupta@...sung.com, p.rajanbabu@...sung.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com, linux-arm-msm@...r.kernel.org, robh@...nel.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 2/4] misc: pci_endpoint_test: Fix the return value of
 IOCTL

On Fri, Nov 29, 2024 at 10:00:30PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Nov 29, 2024 at 07:51:30PM +0900, Damien Le Moal wrote:
> > On 11/29/24 18:24, Manivannan Sadhasivam wrote:
> > > IOCTLs are supposed to return 0 for success and negative error codes for
> > > failure. Currently, this driver is returning 0 for failure and 1 for
> > > success, that's not correct. Hence, fix it!
> > > 
> > > Reported-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > Closes: https://lore.kernel.org/all/YvzNg5ROnxEApDgS@kroah.com
> > > Fixes: 2c156ac71c6b ("misc: Add host side PCI driver for PCI test function device")
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > 
> > Looks OK to me.
> > 
> > Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
> > 
> > One nit below.
> > 
> > [...]
> > 
> > >  static void pci_endpoint_test_remove(struct pci_dev *pdev)
> > > diff --git a/tools/pci/pcitest.c b/tools/pci/pcitest.c
> > > index 470258009ddc..545e04ad63a2 100644
> > > --- a/tools/pci/pcitest.c
> > > +++ b/tools/pci/pcitest.c
> > > @@ -16,7 +16,6 @@
> > >  
> > >  #include <linux/pcitest.h>
> > >  
> > > -static char *result[] = { "NOT OKAY", "OKAY" };
> > >  static char *irq[] = { "LEGACY", "MSI", "MSI-X" };
> > >  
> > >  struct pci_test {
> > > @@ -52,63 +51,65 @@ static int run_test(struct pci_test *test)
> > >  		ret = ioctl(fd, PCITEST_BAR, test->barnum);
> > >  		fprintf(stdout, "BAR%d:\t\t", test->barnum);
> > >  		if (ret < 0)
> > > -			fprintf(stdout, "TEST FAILED\n");
> > > +			fprintf(stdout, "NOT OKAY\n");
> > >  		else
> > > -			fprintf(stdout, "%s\n", result[ret]);
> > > +			fprintf(stdout, "OKAY\n");
> > 
> > Maybe replace all this "if (ret < 0) ... else ..." and all the ones below with
> > something a call to:
> > 
> > static void test_result(int ret)
> > {
> > 	fprintf(stdout, "%sOKAY\n", ret < 0 ? "NOT " : "");
> > }
> > 
> > or simply with the call:
> > 
> > 	fprintf(stdout, "%sOKAY\n", ret < 0 ? "NOT " : "");
> > 
> > to avoid all these repetition.
> > 
> 
> Sounds good to me. Will incorporate in next version, thanks!
> 

Maybe not. This test is converted to Kselftest in successive patches, so no need
to simplify it.

- Mani

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