linux-kernel - Re: [PATCH 1/2] qla2xxx: Rewrite logging functions to use %pV

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Date:	Sun, 31 Jul 2011 10:02:52 +0200
From:	"Rolf Eike Beer" <eike-kernel@...tec.de>
To:	"Joe Perches" <joe@...ches.com>
Cc:	"Andrew Vasquez" <andrew.vasquez@...gic.com>,
	linux-driver@...gic.com,
	"James E.J. Bottomley" <jbottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] qla2xxx: Rewrite logging functions to use %pV

> +	if (vha != NULL) {
> +		const struct pci_dev *pdev = vha->hw->pdev;
> +		/* <module-name> <pci-name> <msg-id>:<host> Message */
> +		pr_warn("%s [%s]-%04x:%ld: %pV",
> +			QL_MSGHDR, dev_name(&(pdev->dev)), id + ql_dbg_offset,
> +			vha->host_no, &vaf);
> +	} else {
> +		pr_warn("%s [%s]-%04x: : %pV",
> +			QL_MSGHDR, "0000:00:00.0", id + ql_dbg_offset, &vaf);
>  	}

If I would see 0000:00:00.0 in the logmessage I would become scared that
something is dereferencing cleared memory, use after free or whatever.
Only by looking into the code I could see that this code simply has no
idea which device it is on. Well, then don't print an address when you
don't have one instead of inventing one.

Eike
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