linux-kernel - RE: [EXT] [PATCH 2/2] octeon_ep: Fix irq releasing in the error handling path of octep_request

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Date:   Mon, 16 May 2022 22:14:10 +0000
From:   Veerasenareddy Burru <vburru@...vell.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Satananda Burla <sburla@...vell.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [EXT] [PATCH 2/2] octeon_ep: Fix irq releasing in the error
 handling path of octep_request_irqs()

> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Sent: Sunday, May 15, 2022 8:57 AM
> To: Veerasenareddy Burru <vburru@...vell.com>; Abhijit Ayarekar
> <aayarekar@...vell.com>; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> Paolo Abeni <pabeni@...hat.com>; Satananda Burla <sburla@...vell.com>
> Cc: linux-kernel@...r.kernel.org; kernel-janitors@...r.kernel.org;
> Christophe JAILLET <christophe.jaillet@...adoo.fr>;
> netdev@...r.kernel.org
> Subject: [EXT] [PATCH 2/2] octeon_ep: Fix irq releasing in the error handling
> path of octep_request_irqs()
> 
> External Email
> 
> ----------------------------------------------------------------------
> For the error handling to work as expected, the index in the 'oct-
> >msix_entries' array must be tweaked because, when the irq are requested
> there is:
> 	msix_entry = &oct->msix_entries[i + num_non_ioq_msix];
> 
> So in the error handling path, 'i + num_non_ioq_msix' should be used instead
> of 'i'.
> 
> The 2nd argument of free_irq() also needs to be adjusted.
> 
> Fixes: 37d79d059606 ("octeon_ep: add Tx/Rx processing and interrupt
> support")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> I think that the wording above is awful, but I'm sure you get it.
> Feel free to rephrase everything to have it more readable.
> ---
>  drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> index 6b60a03574a0..4dcae805422b 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> @@ -257,10 +257,12 @@ static int octep_request_irqs(struct octep_device
> *oct)
> 
>  	return 0;
>  ioq_irq_err:
> +	i += num_non_ioq_msix;
>  	while (i > num_non_ioq_msix) {
>  		--i;
>  		irq_set_affinity_hint(oct->msix_entries[i].vector, NULL);
> -		free_irq(oct->msix_entries[i].vector, oct->ioq_vector[i]);
> +		free_irq(oct->msix_entries[i].vector,
> +			 oct->ioq_vector[i - num_non_ioq_msix]);
Ack.
Thanks for the fix.

Regards,
Veerasenareddy.
>  	}
>  non_ioq_irq_err:
>  	while (i) {
> --
> 2.34.1