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Date: Tue, 30 Jan 2024 18:07:18 -0800
From: Greg KH <gregkh@linuxfoundation.org>
To: Dawei Li <dawei.li@shingroup.cn>
Cc: arnd@arndb.de, fancer.lancer@gmail.com, lkp@intel.com,
	linux-kernel@vger.kernel.org, set_pte_at@outlook.com,
	stable@vger.kernel.org
Subject: Re: [PATCH] misc: eeprom/idt_89hpesx: Convert data structures to LE
 explicitly
Message-ID: <2024013030-paternal-robotics-7fdf@gregkh>
References: <20240130040632.3039911-1-dawei.li@shingroup.cn>
 <2024013039-asleep-rally-39c0@gregkh>
 <03B279416A25E958+ZbmjvFafk44HBl4b@centos8>
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In-Reply-To: <03B279416A25E958+ZbmjvFafk44HBl4b@centos8>

On Wed, Jan 31, 2024 at 09:34:52AM +0800, Dawei Li wrote:
> Hi Greg,
> 
> Thanks for reviewing.
> 
> On Tue, Jan 30, 2024 at 06:04:17AM -0800, Greg KH wrote:
> > On Tue, Jan 30, 2024 at 12:06:32PM +0800, Dawei Li wrote:
> > > For data structures needs cpu_to_le* conversion, its prototype needs to
> > > be declared with __le* explicitly.
> > > 
> > > Fixes: cfad6425382e ("eeprom: Add IDT 89HPESx EEPROM/CSR driver")
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Closes: https://lore.kernel.org/oe-kbuild-all/202401261250.b07Yt30Z-lkp@intel.com/
> > > Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
> > > Cc: <stable@vger.kernel.org>
> > > ---
> > >  drivers/misc/eeprom/idt_89hpesx.c | 6 +++---
> > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/misc/eeprom/idt_89hpesx.c b/drivers/misc/eeprom/idt_89hpesx.c
> > > index d807d08e2614..327afb866b21 100644
> > > --- a/drivers/misc/eeprom/idt_89hpesx.c
> > > +++ b/drivers/misc/eeprom/idt_89hpesx.c
> > > @@ -129,7 +129,7 @@ struct idt_smb_seq {
> > >  struct idt_eeprom_seq {
> > >  	u8 cmd;
> > >  	u8 eeaddr;
> > > -	u16 memaddr;
> > > +	__le16 memaddr;
> > >  	u8 data;
> > >  } __packed;
> > >  
> > > @@ -141,8 +141,8 @@ struct idt_eeprom_seq {
> > >   */
> > >  struct idt_csr_seq {
> > >  	u8 cmd;
> > > -	u16 csraddr;
> > > -	u32 data;
> > > +	__le16 csraddr;
> > > +	__le32 data;
> > >  } __packed;
> > >  
> > >  /*
> > 
> > Declaring them this way is nice, but this doesn't actually "fix"
> > anything at all as no code is actually changed.
> > 
> > So how is ths a bugfix?  How does this patch do anything?
> > 
> > confused,
> 
> Sorry for the confuson.
> 
> This commit is to address the issue reported by kernel test rebot[1].
> 
> Partially quoted from it:
> 
> sparse warnings: (new ones prefixed by >>)
> >> drivers/misc/eeprom/idt_89hpesx.c:599:31: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [assigned] [usertype] memaddr @@     got restricted __le16 [usertype] @@
>    drivers/misc/eeprom/idt_89hpesx.c:599:31: sparse:     expected unsigned short [addressable] [assigned] [usertype] memaddr
>    drivers/misc/eeprom/idt_89hpesx.c:599:31: sparse:     got restricted __le16 [usertype]
>    drivers/misc/eeprom/idt_89hpesx.c:671:31: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [assigned] [usertype] memaddr @@     got restricted __le16 [usertype] @@
>    drivers/misc/eeprom/idt_89hpesx.c:671:31: sparse:     expected unsigned short [addressable] [assigned] [usertype] memaddr
>    drivers/misc/eeprom/idt_89hpesx.c:671:31: sparse:     got restricted __le16 [usertype]
> >> drivers/misc/eeprom/idt_89hpesx.c:769:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [assigned] [usertype] csraddr @@     got restricted __le16 [usertype] @@
>    drivers/misc/eeprom/idt_89hpesx.c:769:24: sparse:     expected unsigned short [addressable] [assigned] [usertype] csraddr
>    drivers/misc/eeprom/idt_89hpesx.c:769:24: sparse:     got restricted __le16 [usertype]
> >> drivers/misc/eeprom/idt_89hpesx.c:770:21: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [addressable] [assigned] [usertype] data @@     got restricted __le32 [usertype] @@
>    drivers/misc/eeprom/idt_89hpesx.c:770:21: sparse:     expected unsigned int [addressable] [assigned] [usertype] data
>    drivers/misc/eeprom/idt_89hpesx.c:770:21: sparse:     got restricted __le32 [usertype]
>    drivers/misc/eeprom/idt_89hpesx.c:834:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [addressable] [assigned] [usertype] csraddr @@     got restricted __le16 [usertype] @@
>    drivers/misc/eeprom/idt_89hpesx.c:834:24: sparse:     expected unsigned short [addressable] [assigned] [usertype] csraddr
>    drivers/misc/eeprom/idt_89hpesx.c:834:24: sparse:     got restricted __le16 [usertype]
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> >> drivers/misc/eeprom/idt_89hpesx.c:859:17: sparse: sparse: cast to restricted __le32
> 
> [1] https://lore.kernel.org/oe-kbuild-all/202401261250.b07Yt30Z-lkp@intel.com/

Ok, so this fixes a sparse issue, how is that needed for stable kernels?

Please be more explicit about what you are "fixing" in the changelog
please, as-is this didn't make any sense to me.

Please fix up and send a v2.

thanks,

greg k-h