Le 24/01/2024 à 05:00, Pucha, HimasekharX Reddy a écrit :
> Hi,
>
> Can you share testing hints for this patch.
Hi,
No I can't.
It was spotted by one of my cocci script that tries to find issues
related to direct return when a function also has an error handling path
+ manual review so see if it looks like a real issue.
As said in the patch, "This patch is speculative, review with care.".
That means that it was not tested from my side.
I don't have the hardware, and don't know how to trigger the issue.
All I know is that the code looks wrong *to me*.
Maybe someone at intel.com could give this hint? :)
CJ
> Regards,
> Himasekhar Reddy.
>
> -----Original Message-----
> From: Intel-wired-lan <[email protected]> On Behalf Of Christophe JAILLET
> Sent: Saturday, January 20, 2024 10:56 PM
> To: Brandeburg, Jesse <[email protected]>; Nguyen, Anthony L <[email protected]>; David S. Miller <[email protected]>; Eric Dumazet <[email protected]>; Jakub Kicinski <[email protected]>; Paolo Abeni <[email protected]>; Jeff Kirsher <[email protected]>; Rustad, Mark D <[email protected]>
> Cc: Christophe JAILLET <[email protected]>; [email protected]; [email protected]; [email protected]; [email protected]
> Subject: [Intel-wired-lan] [PATCH] ixgbe: Fix an error handling path in ixgbe_read_iosf_sb_reg_x550()
>
> All error handling paths, except this one, go to 'out' where
> release_swfw_sync() is called.
> This call balances the acquire_swfw_sync() call done at the beginning of
> the function.
>
> Branch to the error handling path in order to correctly release some
> resources in case of error.
>
> Fixes: ae14a1d8e104 ("ixgbe: Fix IOSF SB access issues")
> Signed-off-by: Christophe JAILLET <[email protected]>
> ---
> This patch is speculative, review with care.
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
> index 6208923e29a2..c1adc94a5a65 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
> @@ -716,7 +716,8 @@ static s32 ixgbe_read_iosf_sb_reg_x550(struct ixgbe_hw *hw, u32 reg_addr,
> if ((command & IXGBE_SB_IOSF_CTRL_RESP_STAT_MASK) != 0) {
> error = FIELD_GET(IXGBE_SB_IOSF_CTRL_CMPL_ERR_MASK, command);
> hw_dbg(hw, "Failed to read, error %x\n", error);
> - return -EIO;
> + ret = -EIO;
> + goto out;
> }
>
> if (!ret)