linux-kernel - Re: [PATCH] lpfc: avoid double-free during PCI error failure

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Message-ID: <45F40D02.9060900@emulex.com>
Date:	Sun, 11 Mar 2007 10:06:58 -0400
From:	James Smart <James.Smart@...lex.Com>
To:	Linas Vepstas <linas@...tin.ibm.com>
CC:	Bino.Sebastian@...lex.Com, linuxppc-dev@...abs.org,
	linux-scsi@...r.kernel.org, James.Bottomley@...elEye.com,
	rlary@...ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lpfc: avoid double-free during PCI error failure

ACK...  Looks good...

-- james s


Linas Vepstas wrote:
> Bino, James,
> Please review, sign-off and forward upstream.
> 
> --linas
> 
> 
> If a PCI error is detected that cannot be recovered from, there
> will be a double call of lpfc_pci_remove_one(), with the second call
> resulting in a null-pointer dereference. The first call occurs in 
> lpfc_io_error_detected(), and the second call during pci device 
> remove. This patch eliminates the first call; its un-needed.
> 
> Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
> 
> ----
>  drivers/scsi/lpfc/lpfc_init.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6.20-git16/drivers/scsi/lpfc/lpfc_init.c
> ===================================================================
> --- linux-2.6.20-git16.orig/drivers/scsi/lpfc/lpfc_init.c	2007-03-08 15:57:40.000000000 -0600
> +++ linux-2.6.20-git16/drivers/scsi/lpfc/lpfc_init.c	2007-03-08 16:03:18.000000000 -0600
> @@ -1817,10 +1817,9 @@ static pci_ers_result_t lpfc_io_error_de
>  	struct lpfc_sli *psli = &phba->sli;
>  	struct lpfc_sli_ring  *pring;
>  
> -	if (state == pci_channel_io_perm_failure) {
> -		lpfc_pci_remove_one(pdev);
> +	if (state == pci_channel_io_perm_failure)
>  		return PCI_ERS_RESULT_DISCONNECT;
> -	}
> +
>  	pci_disable_device(pdev);
>  	/*
>  	 * There may be I/Os dropped by the firmware.
> 
-
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