Re: [PATCH 02/10] aacraid: Fix RRQ overload

[Tomas Henzl <thenzl@redhat.com>]

On 1.12.2015 13:39, Raghava Aditya Renukunta wrote:
> From: Raghava Aditya Renukunta <raghavaaditya.renukunta@pmcs.com>
>
> The driver utilizes an array of atomic variables to keep track of
> IO submissions to each vector. To submit an IO multiple threads
> iterate through the array to find a vector which has empty slots
> to send an IO. The reading and updating of the variable is not atomic,
> causing race conditions when a thread uses a full vector to
> submit an IO.
>
> Fixed by mapping each FIB to a vector, the submission path then uses
> said vector to submit IO thereby removing the possibly of a race
> condition.The vector assignment is started from 1 since vector 0 is
> reserved for the use of AIF management FIBS.If the number of MSIx
> vectors is 1 (MSI or INTx mode) then all the fibs are allocated to
> vector 0.
>
> Signed-off-by: Raghava Aditya Renukunta <raghavaaditya.renukunta@pmcs.com>

Reviewed-by: Tomas Henzl <thenzl@redhat.com>

Tomas