* [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable
@ 2021-02-18 9:21 Muhammad Usama Anjum
2021-02-18 9:40 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Muhammad Usama Anjum @ 2021-02-18 9:21 UTC (permalink / raw)
To: gregkh, lee.jones, johannes, arnd, kuba, gustavoars, wanghai38,
devel, linux-kernel
Cc: musamaanjum
It is wrong to change the endianness of a variable which has just one
byte size.
Sparse warnings fixed:
drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
drivers/staging//wimax/i2400m/op-rfkill.c:159:14: warning: cast to restricted __le32
drivers/staging//wimax/i2400m/op-rfkill.c:160:14: warning: cast to restricted __le32
Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
---
drivers/staging/wimax/i2400m/control.c | 4 ++--
drivers/staging/wimax/i2400m/op-rfkill.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/wimax/i2400m/control.c b/drivers/staging/wimax/i2400m/control.c
index 1e270b2101e8..b6b2788af162 100644
--- a/drivers/staging/wimax/i2400m/control.c
+++ b/drivers/staging/wimax/i2400m/control.c
@@ -452,8 +452,8 @@ void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
d_printf(2, dev, "%s: RF status TLV "
"found (0x%04x), sw 0x%02x hw 0x%02x\n",
tag, I2400M_TLV_RF_STATUS,
- le32_to_cpu(rfss->sw_rf_switch),
- le32_to_cpu(rfss->hw_rf_switch));
+ rfss->sw_rf_switch,
+ rfss->hw_rf_switch);
i2400m_report_tlv_rf_switches_status(i2400m, rfss);
}
if (0 == i2400m_tlv_match(tlv, I2400M_TLV_MEDIA_STATUS, sizeof(*ms))) {
diff --git a/drivers/staging/wimax/i2400m/op-rfkill.c b/drivers/staging/wimax/i2400m/op-rfkill.c
index fbddf2e18c14..a159808f0ec2 100644
--- a/drivers/staging/wimax/i2400m/op-rfkill.c
+++ b/drivers/staging/wimax/i2400m/op-rfkill.c
@@ -156,8 +156,8 @@ void i2400m_report_tlv_rf_switches_status(
enum i2400m_rf_switch_status hw, sw;
enum wimax_st wimax_state;
- sw = le32_to_cpu(rfss->sw_rf_switch);
- hw = le32_to_cpu(rfss->hw_rf_switch);
+ sw = rfss->sw_rf_switch;
+ hw = rfss->hw_rf_switch;
d_fnstart(3, dev, "(i2400m %p rfss %p [hw %u sw %u])\n",
i2400m, rfss, hw, sw);
--
2.25.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable
2021-02-18 9:21 [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable Muhammad Usama Anjum
@ 2021-02-18 9:40 ` Greg KH
2021-02-18 9:54 ` Muhammad Usama Anjum
0 siblings, 1 reply; 4+ messages in thread
From: Greg KH @ 2021-02-18 9:40 UTC (permalink / raw)
To: Muhammad Usama Anjum
Cc: devel, wanghai38, arnd, gustavoars, linux-kernel, kuba, johannes,
lee.jones
On Thu, Feb 18, 2021 at 02:21:54PM +0500, Muhammad Usama Anjum wrote:
> It is wrong to change the endianness of a variable which has just one
> byte size.
>
> Sparse warnings fixed:
> drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/op-rfkill.c:159:14: warning: cast to restricted __le32
> drivers/staging//wimax/i2400m/op-rfkill.c:160:14: warning: cast to restricted __le32
>
> Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
> ---
> drivers/staging/wimax/i2400m/control.c | 4 ++--
> drivers/staging/wimax/i2400m/op-rfkill.c | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/wimax/i2400m/control.c b/drivers/staging/wimax/i2400m/control.c
> index 1e270b2101e8..b6b2788af162 100644
> --- a/drivers/staging/wimax/i2400m/control.c
> +++ b/drivers/staging/wimax/i2400m/control.c
> @@ -452,8 +452,8 @@ void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
> d_printf(2, dev, "%s: RF status TLV "
> "found (0x%04x), sw 0x%02x hw 0x%02x\n",
> tag, I2400M_TLV_RF_STATUS,
> - le32_to_cpu(rfss->sw_rf_switch),
> - le32_to_cpu(rfss->hw_rf_switch));
> + rfss->sw_rf_switch,
> + rfss->hw_rf_switch);
What do you mean by "one byte"? This is a le32 sized variable, right?
If not, why isn't the le32_to_cpu() call complaining?
> i2400m_report_tlv_rf_switches_status(i2400m, rfss);
> }
> if (0 == i2400m_tlv_match(tlv, I2400M_TLV_MEDIA_STATUS, sizeof(*ms))) {
> diff --git a/drivers/staging/wimax/i2400m/op-rfkill.c b/drivers/staging/wimax/i2400m/op-rfkill.c
> index fbddf2e18c14..a159808f0ec2 100644
> --- a/drivers/staging/wimax/i2400m/op-rfkill.c
> +++ b/drivers/staging/wimax/i2400m/op-rfkill.c
> @@ -156,8 +156,8 @@ void i2400m_report_tlv_rf_switches_status(
> enum i2400m_rf_switch_status hw, sw;
> enum wimax_st wimax_state;
>
> - sw = le32_to_cpu(rfss->sw_rf_switch);
> - hw = le32_to_cpu(rfss->hw_rf_switch);
> + sw = rfss->sw_rf_switch;
> + hw = rfss->hw_rf_switch;
Same here.
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable
2021-02-18 9:40 ` Greg KH
@ 2021-02-18 9:54 ` Muhammad Usama Anjum
2021-02-18 18:32 ` Arnd Bergmann
0 siblings, 1 reply; 4+ messages in thread
From: Muhammad Usama Anjum @ 2021-02-18 9:54 UTC (permalink / raw)
To: Greg KH
Cc: devel, wanghai38, arnd, gustavoars, linux-kernel, kuba, johannes,
lee.jones, musamaanjum
On Thu, 2021-02-18 at 10:40 +0100, Greg KH wrote:
> On Thu, Feb 18, 2021 at 02:21:54PM +0500, Muhammad Usama Anjum wrote:
> > It is wrong to change the endianness of a variable which has just one
> > byte size.
> >
> > Sparse warnings fixed:
> > drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> > drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> > drivers/staging//wimax/i2400m/op-rfkill.c:159:14: warning: cast to restricted __le32
> > drivers/staging//wimax/i2400m/op-rfkill.c:160:14: warning: cast to restricted __le32
> >
> > Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
> > ---
> > drivers/staging/wimax/i2400m/control.c | 4 ++--
> > drivers/staging/wimax/i2400m/op-rfkill.c | 4 ++--
> > 2 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/wimax/i2400m/control.c b/drivers/staging/wimax/i2400m/control.c
> > index 1e270b2101e8..b6b2788af162 100644
> > --- a/drivers/staging/wimax/i2400m/control.c
> > +++ b/drivers/staging/wimax/i2400m/control.c
> > @@ -452,8 +452,8 @@ void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
> > d_printf(2, dev, "%s: RF status TLV "
> > "found (0x%04x), sw 0x%02x hw 0x%02x\n",
> > tag, I2400M_TLV_RF_STATUS,
> > - le32_to_cpu(rfss->sw_rf_switch),
> > - le32_to_cpu(rfss->hw_rf_switch));
> > + rfss->sw_rf_switch,
> > + rfss->hw_rf_switch);
>
> What do you mean by "one byte"? This is a le32 sized variable, right?
> If not, why isn't the le32_to_cpu() call complaining?
These two variables are of type _u8, one byte.
__u8 sw_rf_switch;
__u8 hw_rf_switch;
They aren't of type __le32. le32_to_cpu() macro should have
complained. But it isn't complaining. It seems like whatever we pass
to this macro, it casts it to __le32 forcefully (it seems like wrong).
So we'll never get any complain from this macro directly. But we are
getting complain from the sparse.
For big endian:
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
For little endian:
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
> > i2400m_report_tlv_rf_switches_status(i2400m, rfss);
> > }
> > if (0 == i2400m_tlv_match(tlv, I2400M_TLV_MEDIA_STATUS, sizeof(*ms))) {
> > diff --git a/drivers/staging/wimax/i2400m/op-rfkill.c b/drivers/staging/wimax/i2400m/op-rfkill.c
> > index fbddf2e18c14..a159808f0ec2 100644
> > --- a/drivers/staging/wimax/i2400m/op-rfkill.c
> > +++ b/drivers/staging/wimax/i2400m/op-rfkill.c
> > @@ -156,8 +156,8 @@ void i2400m_report_tlv_rf_switches_status(
> > enum i2400m_rf_switch_status hw, sw;
> > enum wimax_st wimax_state;
> >
> > - sw = le32_to_cpu(rfss->sw_rf_switch);
> > - hw = le32_to_cpu(rfss->hw_rf_switch);
> > + sw = rfss->sw_rf_switch;
> > + hw = rfss->hw_rf_switch;
>
> Same here.
Same here.
> thanks,
>
> greg k-h
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable
2021-02-18 9:54 ` Muhammad Usama Anjum
@ 2021-02-18 18:32 ` Arnd Bergmann
0 siblings, 0 replies; 4+ messages in thread
From: Arnd Bergmann @ 2021-02-18 18:32 UTC (permalink / raw)
To: Muhammad Usama Anjum
Cc: driverdevel, wanghai38, Arnd Bergmann, Greg KH,
Gustavo A. R. Silva, linux-kernel, Jakub Kicinski, Johannes Berg,
Lee Jones
On Thu, Feb 18, 2021 at 10:54 AM Muhammad Usama Anjum
<musamaanjum@gmail.com> wrote:
>
> On Thu, 2021-02-18 at 10:40 +0100, Greg KH wrote:
> > On Thu, Feb 18, 2021 at 02:21:54PM +0500, Muhammad Usama Anjum wrote:
> > > It is wrong to change the endianness of a variable which has just one
> > > byte size.
> > >
> > > Sparse warnings fixed:
> > > drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> > > drivers/staging//wimax/i2400m/control.c:452:17: warning: cast to restricted __le32
> > > drivers/staging//wimax/i2400m/op-rfkill.c:159:14: warning: cast to restricted __le32
> > > drivers/staging//wimax/i2400m/op-rfkill.c:160:14: warning: cast to restricted __le32
> > >
> > > Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
> > > ---
> > > drivers/staging/wimax/i2400m/control.c | 4 ++--
> > > drivers/staging/wimax/i2400m/op-rfkill.c | 4 ++--
> > > 2 files changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/staging/wimax/i2400m/control.c b/drivers/staging/wimax/i2400m/control.c
> > > index 1e270b2101e8..b6b2788af162 100644
> > > --- a/drivers/staging/wimax/i2400m/control.c
> > > +++ b/drivers/staging/wimax/i2400m/control.c
> > > @@ -452,8 +452,8 @@ void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
> > > d_printf(2, dev, "%s: RF status TLV "
> > > "found (0x%04x), sw 0x%02x hw 0x%02x\n",
> > > tag, I2400M_TLV_RF_STATUS,
> > > - le32_to_cpu(rfss->sw_rf_switch),
> > > - le32_to_cpu(rfss->hw_rf_switch));
> > > + rfss->sw_rf_switch,
> > > + rfss->hw_rf_switch);
> >
> > What do you mean by "one byte"? This is a le32 sized variable, right?
> > If not, why isn't the le32_to_cpu() call complaining?
>
> These two variables are of type _u8, one byte.
> __u8 sw_rf_switch;
> __u8 hw_rf_switch;
> They aren't of type __le32. le32_to_cpu() macro should have
> complained. But it isn't complaining. It seems like whatever we pass
> to this macro, it casts it to __le32 forcefully (it seems like wrong).
> So we'll never get any complain from this macro directly. But we are
> getting complain from the sparse.
>
> For big endian:
> #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
> For little endian:
> #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
Right, it seems this driver has been broken on big-endian ever since
it was first merged in 2008.
Arnd
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2021-02-18 9:21 [PATCH] staging: wimax/i2400m: don't change the endianness of one byte variable Muhammad Usama Anjum
2021-02-18 9:40 ` Greg KH
2021-02-18 9:54 ` Muhammad Usama Anjum
2021-02-18 18:32 ` Arnd Bergmann
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