linux-kernel - Re: [PATCH] misc: ibmvsm: Fix wrong assignment of return code

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Date:   Tue, 07 Aug 2018 22:28:40 +1000
From:   Michael Ellerman <michaele@....ibm.com>
To:     "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        gregkh@...uxfoundation.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        "Bryant G. Ly" <bryantly@...ux.ibm.com>
Subject: Re: [PATCH] misc: ibmvsm: Fix wrong assignment of return code

"Bryant G. Ly" <bryantly@...ux.vnet.ibm.com> writes:

> From: "Bryant G. Ly" <bryantly@...ux.ibm.com>
>
> Currently the assignment is flipped and rc is always 0.

If you'd left rc uninitialised at the start of the function the compiler
would have caught it for you.

And what is the consequence of the bug? Nothing, complete system crash,
subtle data corruption?

Also this should be tagged:

Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)")

cheers

> diff --git a/drivers/misc/ibmvmc.c b/drivers/misc/ibmvmc.c
> index 8f82bb9..b8aaa68 100644
> --- a/drivers/misc/ibmvmc.c
> +++ b/drivers/misc/ibmvmc.c
> @@ -2131,7 +2131,7 @@ static int ibmvmc_init_crq_queue(struct crq_server_adapter *adapter)
>  	retrc = plpar_hcall_norets(H_REG_CRQ,
>  				   vdev->unit_address,
>  				   queue->msg_token, PAGE_SIZE);
> -	retrc = rc;
> +	rc = retrc;
>  
>  	if (rc == H_RESOURCE)
>  		rc = ibmvmc_reset_crq_queue(adapter);