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Date: Mon, 29 Jul 2019 08:59:36 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] scsi: qlogicpti: Mark expected switch fall-throughs
On Mon, Jul 29, 2019 at 06:03:45AM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
>
> This patch fixes the following warnings (Building: sparc defconfig):
>
> drivers/scsi/qlogicpti.c: In function 'qlogicpti_mbox_command':
> drivers/scsi/qlogicpti.c:202:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:203:2: note: here
> case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
> ^~~~
> drivers/scsi/qlogicpti.c:203:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:204:2: note: here
> case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
> ^~~~
> drivers/scsi/qlogicpti.c:204:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:205:2: note: here
> case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
> ^~~~
> drivers/scsi/qlogicpti.c:205:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:206:2: note: here
> case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
> ^~~~
> drivers/scsi/qlogicpti.c:206:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:207:2: note: here
> case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
> ^~~~
> drivers/scsi/qlogicpti.c:256:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
> ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:257:2: note: here
> case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
> ^~~~
> drivers/scsi/qlogicpti.c:257:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
> ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:258:2: note: here
> case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
> ^~~~
> drivers/scsi/qlogicpti.c:258:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
> ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:259:2: note: here
> case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
> ^~~~
> drivers/scsi/qlogicpti.c:259:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
> ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:260:2: note: here
> case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
> ^~~~
> drivers/scsi/qlogicpti.c:260:19: warning: this statement may fall through [-Wimplicit-fallthrough=]
> case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
> ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/scsi/qlogicpti.c:261:2: note: here
> case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
> ^~~~
>
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
-Kees
> ---
> drivers/scsi/qlogicpti.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
> index 9335849f6bea..d539beef3ce8 100644
> --- a/drivers/scsi/qlogicpti.c
> +++ b/drivers/scsi/qlogicpti.c
> @@ -200,10 +200,15 @@ static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int f
> /* Write mailbox command registers. */
> switch (mbox_param[param[0]] >> 4) {
> case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
> + /* Fall through */
> case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
> + /* Fall through */
> case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
> + /* Fall through */
> case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
> + /* Fall through */
> case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
> + /* Fall through */
> case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
> }
>
> @@ -254,10 +259,15 @@ static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int f
> /* Read back output parameters. */
> switch (mbox_param[param[0]] & 0xf) {
> case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
> + /* Fall through */
> case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
> + /* Fall through */
> case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
> + /* Fall through */
> case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
> + /* Fall through */
> case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
> + /* Fall through */
> case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
> }
>
> --
> 2.22.0
>
--
Kees Cook
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