Re: [PATCH] usb: gadget: UMS: fix 64-bit division on ARM32

[Mattijs Korpershoek <mkorpershoek@baylibre.com>]

Hi Caleb,

Thank you for the patch.

On jeu., mars 21, 2024 at 15:28, Caleb Connolly <caleb.connolly@linaro.org> wrote:

> The patch introducing support for dynamic sector sizes changed the types
> used in some divisions, resulting in the compiler attempting to use
> libgcc helpers (__aeabi_ldivmod). Replace these divisions with calls to
> lldiv() to handle this correctly.
>
> Fixes: 74e56e0c5065 ("usb: gadget: UMS: support multiple sector sizes")
> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

Would it be okay if I squashed this into
commit 74e56e0c5065 ("usb: gadget: UMS: support multiple sector sizes")
?

I'd like to not (intentionally) send any patches that don't compile to Tom.


> ---
> Hi Mattijs,
>
> Sorry for not catching that sooner! I compile tested this locally and a

No worries, thanks a lot for the quick fix.

> CI pipeline is running here: https://source.denx.de/u-boot/custodians/u-boot-snapdragon/-/pipelines/20029

I can see from the above pipeline that some other failures are ongoing,
but they are not related to lldiv().

arm-linux-gnueabi-ld.bfd: common/dfu.o: in function `run_usb_dnl_gadget':
common/dfu.c:82:(.text.run_usb_dnl_gadget+0xd8): undefined reference to `dm_usb_gadget_handle_interrupts'
arm-linux-gnueabi-ld.bfd: common/dfu.c:108:(.text.run_usb_dnl_gadget+0x11c): undefined reference to `dm_usb_gadget_handle_interrupts'
make[1]: *** [Makefile:1793: u-boot] Error

See: https://source.denx.de/u-boot/custodians/u-boot-snapdragon/-/jobs/802759#L470

I suspect that this is related to:
https://lore.kernel.org/r/all/20240225152715.1821613-1-jonas@kwiboo.se/


>
> Regards,
> Caleb
> ---
>  drivers/usb/gadget/f_mass_storage.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
> index d880928044f4..ef90c7ec7fb5 100644
> --- a/drivers/usb/gadget/f_mass_storage.c
> +++ b/drivers/usb/gadget/f_mass_storage.c
> @@ -239,8 +239,9 @@
>  /* #define VERBOSE_DEBUG */
>  /* #define DUMP_MSGS */
>  
>  #include <config.h>
> +#include <div64.h>
>  #include <hexdump.h>
>  #include <log.h>
>  #include <malloc.h>
>  #include <common.h>
> @@ -768,10 +769,10 @@ static int do_read(struct fsg_common *common)
>  		}
>  
>  		/* Perform the read */
>  		rc = ums[common->lun].read_sector(&ums[common->lun],
> -				      file_offset / curlun->blksize,
> -				      amount / curlun->blksize,
> +				      lldiv(file_offset, curlun->blksize),
> +				      lldiv(amount, curlun->blksize),
>  				      (char __user *)bh->buf);
>  		if (!rc)
>  			return -EIO;
>  
> @@ -942,10 +943,10 @@ static int do_write(struct fsg_common *common)
>  			amount = bh->outreq->actual;
>  
>  			/* Perform the write */
>  			rc = ums[common->lun].write_sector(&ums[common->lun],
> -					       file_offset / curlun->blksize,
> -					       amount / curlun->blksize,
> +					       lldiv(file_offset, curlun->blksize),
> +					       lldiv(amount, curlun->blksize),
>  					       (char __user *)bh->buf);
>  			if (!rc)
>  				return -EIO;
>  			nwritten = rc * curlun->blksize;
> @@ -1058,10 +1059,10 @@ static int do_verify(struct fsg_common *common)
>  		}
>  
>  		/* Perform the read */
>  		rc = ums[common->lun].read_sector(&ums[common->lun],
> -				      file_offset / curlun->blksize,
> -				      amount / curlun->blksize,
> +				      lldiv(file_offset, curlun->blksize),
> +				      lldiv(amount, curlun->blksize),
>  				      (char __user *)bh->buf);
>  		if (!rc)
>  			return -EIO;
>  		nread = rc * curlun->blksize;
> -- 
> 2.44.0