Building the advansys driver in a big-endian configuration such as
ARM allmodconfig shows a warning:
drivers/scsi/advansys.c: In function 'adv_build_req':
include/uapi/linux/byteorder/big_endian.h:32:26: warning: large integer implicitly truncated to unsigned type [-Woverflow]
#define __cpu_to_le32(x) ((__force __le32)__swab32((x)))
drivers/scsi/advansys.c:7806:22: note: in expansion of macro 'cpu_to_le32'
scsiqp->sense_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
It turns out that the commit that introduced this used the cpu_to_le32()
incorrectly on an 8-bit field, which results in the sense_len to always
be set to zero, as the SCSI_SENSE_BUFFERSIZE value gets moved to upper
byte of the 32-bit intermediate.
This removes the cpu_to_le32() call to restore the original version.
I found this only by looking at the compiler output and have not done
a full review for possible further endianess bugs in the same driver.
Signed-off-by: Arnd Bergmann <[email protected]>
Fixes: 811ddc057aac ("advansys: use DMA-API for mapping sense buffer")
Cc: [email protected] # v4.2+
---
Using [email protected], as the address listed in MAINTAINERS
failed:
Failed to transport message. Message sending failed since the following recipients were rejected by the server: [email protected] (The server responded: Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record)
Geert found the same bug and submitted the same patch earlier:
https://lkml.org/lkml/2015/6/24/89
Neither one has been reviewed or accepted so far. Can we get one of the
two merged please?
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index 4305178e4e01..1c1cd657c380 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -7803,7 +7803,7 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
return ASC_BUSY;
}
scsiqp->sense_addr = cpu_to_le32(sense_addr);
- scsiqp->sense_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
+ scsiqp->sense_len = SCSI_SENSE_BUFFERSIZE;
/* Build ADV_SCSI_REQ_Q */
On Mon, Nov 16, 2015 at 05:49:23PM +0100, Arnd Bergmann wrote:
> It turns out that the commit that introduced this used the cpu_to_le32()
> incorrectly on an 8-bit field, which results in the sense_len to always
> be set to zero, as the SCSI_SENSE_BUFFERSIZE value gets moved to upper
> byte of the 32-bit intermediate.
More people need to run the sparse checker with -D__CHECK_ENDIAN__ and
have proper endian annotations?
--
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
On Mon, Nov 16, 2015 at 06:20:31PM +0000, Russell King - ARM Linux wrote:
> On Mon, Nov 16, 2015 at 05:49:23PM +0100, Arnd Bergmann wrote:
> > It turns out that the commit that introduced this used the cpu_to_le32()
> > incorrectly on an 8-bit field, which results in the sense_len to always
> > be set to zero, as the SCSI_SENSE_BUFFERSIZE value gets moved to upper
> > byte of the 32-bit intermediate.
>
> More people need to run the sparse checker with -D__CHECK_ENDIAN__ and
> have proper endian annotations?
Ho about enabling __CHECK_ENDIAN__ by default when running sparse at
least?
On Mon, Nov 16, 2015 at 7:20 PM, Russell King - ARM Linux
<[email protected]> wrote:
> On Mon, Nov 16, 2015 at 05:49:23PM +0100, Arnd Bergmann wrote:
>> It turns out that the commit that introduced this used the cpu_to_le32()
>> incorrectly on an 8-bit field, which results in the sense_len to always
>> be set to zero, as the SCSI_SENSE_BUFFERSIZE value gets moved to upper
>> byte of the 32-bit intermediate.
>
> More people need to run the sparse checker with -D__CHECK_ENDIAN__ and
> have proper endian annotations?
Sure.
But in this case, it shows up as a normal compiler warning on all big endian
platforms.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
On 11/16/2015 05:49 PM, Arnd Bergmann wrote:
> Building the advansys driver in a big-endian configuration such as
> ARM allmodconfig shows a warning:
>
> drivers/scsi/advansys.c: In function 'adv_build_req':
> include/uapi/linux/byteorder/big_endian.h:32:26: warning: large integer implicitly truncated to unsigned type [-Woverflow]
> #define __cpu_to_le32(x) ((__force __le32)__swab32((x)))
> drivers/scsi/advansys.c:7806:22: note: in expansion of macro 'cpu_to_le32'
> scsiqp->sense_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
>
> It turns out that the commit that introduced this used the cpu_to_le32()
> incorrectly on an 8-bit field, which results in the sense_len to always
> be set to zero, as the SCSI_SENSE_BUFFERSIZE value gets moved to upper
> byte of the 32-bit intermediate.
>
> This removes the cpu_to_le32() call to restore the original version.
>
> I found this only by looking at the compiler output and have not done
> a full review for possible further endianess bugs in the same driver.
>
> Signed-off-by: Arnd Bergmann <[email protected]>
> Fixes: 811ddc057aac ("advansys: use DMA-API for mapping sense buffer")
> Cc: [email protected] # v4.2+
> ---
> Using [email protected], as the address listed in MAINTAINERS
> failed:
>
> Failed to transport message. Message sending failed since the following recipients were rejected by the server: [email protected] (The server responded: Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record)
>
> Geert found the same bug and submitted the same patch earlier:
> https://lkml.org/lkml/2015/6/24/89
>
> Neither one has been reviewed or accepted so far. Can we get one of the
> two merged please?
>
> diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
> index 4305178e4e01..1c1cd657c380 100644
> --- a/drivers/scsi/advansys.c
> +++ b/drivers/scsi/advansys.c
> @@ -7803,7 +7803,7 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
> return ASC_BUSY;
> }
> scsiqp->sense_addr = cpu_to_le32(sense_addr);
> - scsiqp->sense_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
> + scsiqp->sense_len = SCSI_SENSE_BUFFERSIZE;
>
> /* Build ADV_SCSI_REQ_Q */
>
>
Ho-hum. You are right.
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N?rnberg
GF: F. Imend?rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG N?rnberg)
>>>>> "Arnd" == Arnd Bergmann <[email protected]> writes:
Arnd> Building the advansys driver in a big-endian configuration such as
Arnd> ARM allmodconfig shows a warning:
Applied to 4.4.
--
Martin K. Petersen Oracle Linux Engineering