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Date: Wed, 31 Jan 2024 10:19:22 +0800
From: Dawei Li <dawei.li@shingroup.cn>
To: Greg KH <gregkh@linuxfoundation.org>
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: <3A58BAAB108DEC6B+ZbmuKg9jkVmHHN0Y@centos8>
References: <20240130040632.3039911-1-dawei.li@shingroup.cn>
 <2024013039-asleep-rally-39c0@gregkh>
 <03B279416A25E958+ZbmjvFafk44HBl4b@centos8>
 <2024013030-paternal-robotics-7fdf@gregkh>
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In-Reply-To: <2024013030-paternal-robotics-7fdf@gregkh>
Feedback-ID: bizesmtp:shingroup.cn:qybglogicsvrgz:qybglogicsvrgz5a-1

Hi Greg,

On Tue, Jan 30, 2024 at 06:07:18PM -0800, Greg KH wrote:
> 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.

Yes, it's my fault not making it clear in commit message. Sorry for
that.

> 
> Please fix up and send a v2.

Will do that.

> 
> thanks,
> 
> greg k-h
> 

Thanks,

    Dawei