From: Simon Horman <horms@kernel•org>
To: Nick Child <nnac123@linux•ibm.com>
Cc: netdev@vger•kernel.org, haren@linux•ibm.com, ricklind@us•ibm.com,
danymadden@us•ibm.com, tlfalcon@linux•ibm.com,
bjking1@linux•ibm.com
Subject: Re: [PATCH net 3/5] ibmvnic: Handle DMA unmapping of login buffs in release functions
Date: Sat, 5 Aug 2023 09:19:56 +0200 [thread overview]
Message-ID: <ZM34HOmVA0ggBJdN@vergenet.net> (raw)
In-Reply-To: <20230803202010.37149-3-nnac123@linux.ibm.com>
On Thu, Aug 03, 2023 at 03:20:08PM -0500, Nick Child wrote:
> Rather than leaving the DMA unmapping of the login buffers to the
> login response handler, move this work into the login release functions.
> Previously, these functions were only used for freeing the allocated
> buffers. This could lead to issues if there are more than one
> outstanding login buffer requests, which is possible if a login request
> times out.
>
> If a login request times out, then there is another call to send login.
> The send login function makes a call to the login buffer release
> function. In the past, this freed the buffers but did not DMA unmap.
> Therefore, the VIOS could still write to the old login (now freed)
> buffer. It is for this reason that it is a good idea to leave the DMA
> unmap call to the login buffers release function.
>
> Since the login buffer release functions now handle DMA unmapping,
> remove the duplicate DMA unmapping in handle_login_rsp().
>
> Fixes: dff515a3e71d ("ibmvnic: Harden device login requests")
> Signed-off-by: Nick Child <nnac123@linux•ibm.com>
Reviewed-by: Simon Horman <horms@kernel•org>
next prev parent reply other threads:[~2023-08-05 7:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-03 20:20 [PATCH net 1/5] ibmvnic: Enforce stronger sanity checks on login response Nick Child
2023-08-03 20:20 ` [PATCH net 2/5] ibmvnic: Unmap DMA login rsp buffer on send login fail Nick Child
2023-08-05 7:19 ` Simon Horman
2023-08-03 20:20 ` [PATCH net 3/5] ibmvnic: Handle DMA unmapping of login buffs in release functions Nick Child
2023-08-05 7:19 ` Simon Horman [this message]
2023-08-03 20:20 ` [PATCH net 4/5] ibmvnic: Do partial reset on login failure Nick Child
2023-08-05 7:20 ` Simon Horman
2023-08-03 20:20 ` [PATCH net 5/5] ibmvnic: Ensure login failure recovery is safe from other resets Nick Child
2023-08-05 7:20 ` Simon Horman
2023-08-08 2:13 ` Jakub Kicinski
2023-08-05 7:18 ` [PATCH net 1/5] ibmvnic: Enforce stronger sanity checks on login response Simon Horman
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