* [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed
@ 2020-09-14 16:02 Yann Sionneau
2020-09-15 7:33 ` Sascha Hauer
0 siblings, 1 reply; 5+ messages in thread
From: Yann Sionneau @ 2020-09-14 16:02 UTC (permalink / raw)
To: barebox; +Cc: Yann Sionneau
char type can be either signed or unsigned according to C standard.
If your arch has signed char, this kind of computation will end up wrong
because of sign extension:
https://git.pengutronix.de/cgit/barebox/tree/drivers/mci/mci-core.c#n869
mci->capacity = mci->ext_csd[EXT_CSD_SEC_COUNT] << 0 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;
Turning the ext_csd field into u8 * fixes the issue.
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
---
include/mci.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/mci.h b/include/mci.h
index 96547fb39..f6d845440 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -456,7 +456,7 @@ struct mci {
uint64_t capacity; /**< Card's data capacity in bytes */
int ready_for_use; /** true if already probed */
int dsr_imp; /**< DSR implementation state from CSD */
- char *ext_csd;
+ u8 *ext_csd;
int probe;
struct param_d *param_boot;
int bootpart;
--
2.17.1
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed
2020-09-14 16:02 [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed Yann Sionneau
@ 2020-09-15 7:33 ` Sascha Hauer
0 siblings, 0 replies; 5+ messages in thread
From: Sascha Hauer @ 2020-09-15 7:33 UTC (permalink / raw)
To: Yann Sionneau; +Cc: barebox
On Mon, Sep 14, 2020 at 06:02:08PM +0200, Yann Sionneau wrote:
> char type can be either signed or unsigned according to C standard.
> If your arch has signed char, this kind of computation will end up wrong
> because of sign extension:
>
> https://git.pengutronix.de/cgit/barebox/tree/drivers/mci/mci-core.c#n869
>
> mci->capacity = mci->ext_csd[EXT_CSD_SEC_COUNT] << 0 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;
>
> Turning the ext_csd field into u8 * fixes the issue.
>
> Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
> ---
> include/mci.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks
Sascha
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed
2020-09-14 15:51 ` Ahmad Fatoum
@ 2020-09-14 16:03 ` Yann Sionneau
0 siblings, 0 replies; 5+ messages in thread
From: Yann Sionneau @ 2020-09-14 16:03 UTC (permalink / raw)
To: Ahmad Fatoum, barebox
Woops, forgot about the Signed-off-by. Sorry!
On 9/14/20 5:51 PM, Ahmad Fatoum wrote:
> Hello Yann,
>
> On 9/14/20 5:27 PM, Yann Sionneau wrote:
>> char type can be either signed or unsigned according to C standard.
>> If your arch has signed char, this kind of computation will end up wrong
>> because of sign extension:
>>
>> https://git.pengutronix.de/cgit/barebox/tree/drivers/mci/mci-core.c#n869
>>
>> mci->capacity = mci->ext_csd[EXT_CSD_SEC_COUNT] << 0 |
>> mci->ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
>> mci->ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
>> mci->ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;
> Good catch! I wondered why this wasn't noticed before,
> so I looked at the OSELAS.Toolchain`s we have on our build
> server. Only x86 and MIPS have signed chars by default.
>
> On x86, we usually do EFI, so barebox mci-core is not involved
> and MIPS apparently doesn't have any MCI drivers yet.
>
> (Of course, you can compile do -fsigned-char or compile
> your own toolchain with a different default, but I guess
> not many do that)
>
> Thanks for fixing it.
>
>> Turning the ext_csd field into u8 * fixes the issue.
> Your Signed-off-by is required.
> Please check https://developercertificate.org/
>
>> ---
>> include/mci.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/mci.h b/include/mci.h
>> index 96547fb39..f6d845440 100644
>> --- a/include/mci.h
>> +++ b/include/mci.h
>> @@ -456,7 +456,7 @@ struct mci {
>> uint64_t capacity; /**< Card's data capacity in bytes */
>> int ready_for_use; /** true if already probed */
>> int dsr_imp; /**< DSR implementation state from CSD */
>> - char *ext_csd;
>> + u8 *ext_csd;
>> int probe;
>> struct param_d *param_boot;
>> int bootpart;
>>
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed
2020-09-14 15:27 Yann Sionneau
@ 2020-09-14 15:51 ` Ahmad Fatoum
2020-09-14 16:03 ` Yann Sionneau
0 siblings, 1 reply; 5+ messages in thread
From: Ahmad Fatoum @ 2020-09-14 15:51 UTC (permalink / raw)
To: Yann Sionneau, barebox
Hello Yann,
On 9/14/20 5:27 PM, Yann Sionneau wrote:
> char type can be either signed or unsigned according to C standard.
> If your arch has signed char, this kind of computation will end up wrong
> because of sign extension:
>
> https://git.pengutronix.de/cgit/barebox/tree/drivers/mci/mci-core.c#n869
>
> mci->capacity = mci->ext_csd[EXT_CSD_SEC_COUNT] << 0 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
> mci->ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;
Good catch! I wondered why this wasn't noticed before,
so I looked at the OSELAS.Toolchain`s we have on our build
server. Only x86 and MIPS have signed chars by default.
On x86, we usually do EFI, so barebox mci-core is not involved
and MIPS apparently doesn't have any MCI drivers yet.
(Of course, you can compile do -fsigned-char or compile
your own toolchain with a different default, but I guess
not many do that)
Thanks for fixing it.
> Turning the ext_csd field into u8 * fixes the issue.
Your Signed-off-by is required.
Please check https://developercertificate.org/
> ---
> include/mci.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/mci.h b/include/mci.h
> index 96547fb39..f6d845440 100644
> --- a/include/mci.h
> +++ b/include/mci.h
> @@ -456,7 +456,7 @@ struct mci {
> uint64_t capacity; /**< Card's data capacity in bytes */
> int ready_for_use; /** true if already probed */
> int dsr_imp; /**< DSR implementation state from CSD */
> - char *ext_csd;
> + u8 *ext_csd;
> int probe;
> struct param_d *param_boot;
> int bootpart;
>
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] mci: fix wrong sd/mmc/emmc card size computation for arch where char is signed
@ 2020-09-14 15:27 Yann Sionneau
2020-09-14 15:51 ` Ahmad Fatoum
0 siblings, 1 reply; 5+ messages in thread
From: Yann Sionneau @ 2020-09-14 15:27 UTC (permalink / raw)
To: barebox; +Cc: Yann Sionneau
char type can be either signed or unsigned according to C standard.
If your arch has signed char, this kind of computation will end up wrong
because of sign extension:
https://git.pengutronix.de/cgit/barebox/tree/drivers/mci/mci-core.c#n869
mci->capacity = mci->ext_csd[EXT_CSD_SEC_COUNT] << 0 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 |
mci->ext_csd[EXT_CSD_SEC_COUNT + 3] << 24;
Turning the ext_csd field into u8 * fixes the issue.
---
include/mci.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/mci.h b/include/mci.h
index 96547fb39..f6d845440 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -456,7 +456,7 @@ struct mci {
uint64_t capacity; /**< Card's data capacity in bytes */
int ready_for_use; /** true if already probed */
int dsr_imp; /**< DSR implementation state from CSD */
- char *ext_csd;
+ u8 *ext_csd;
int probe;
struct param_d *param_boot;
int bootpart;
--
2.17.1
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barebox@lists.infradead.org
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