* [PATCH] Revert "powerpc/powernv: Fix endian bug in LPC bus debugfs accessors"
@ 2014-10-28 1:15 Michael Ellerman
2014-10-28 3:53 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 2+ messages in thread
From: Michael Ellerman @ 2014-10-28 1:15 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc-dev
This reverts commit bf7588a0859580a45c63cb082825d77c13eca357.
Ben says, "The original code was fine, I think the bug was actually in
the userspace tool I was using (don't worry, nothing on the field uses
that interface yet and I can still fix the tool)."
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/platforms/powernv/opal-lpc.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/opal-lpc.c b/arch/powerpc/platforms/powernv/opal-lpc.c
index dd2c285ad170..ad4b31df779a 100644
--- a/arch/powerpc/platforms/powernv/opal-lpc.c
+++ b/arch/powerpc/platforms/powernv/opal-lpc.c
@@ -191,7 +191,6 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf,
{
struct lpc_debugfs_entry *lpc = filp->private_data;
u32 data, pos, len, todo;
- __be32 bedata;
int rc;
if (!access_ok(VERIFY_WRITE, ubuf, count))
@@ -214,10 +213,9 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf,
len = 2;
}
rc = opal_lpc_read(opal_lpc_chip_id, lpc->lpc_type, pos,
- &bedata, len);
+ &data, len);
if (rc)
return -ENXIO;
- data = be32_to_cpu(bedata);
switch(len) {
case 4:
rc = __put_user((u32)data, (u32 __user *)ubuf);
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Revert "powerpc/powernv: Fix endian bug in LPC bus debugfs accessors"
2014-10-28 1:15 [PATCH] Revert "powerpc/powernv: Fix endian bug in LPC bus debugfs accessors" Michael Ellerman
@ 2014-10-28 3:53 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 2+ messages in thread
From: Benjamin Herrenschmidt @ 2014-10-28 3:53 UTC (permalink / raw)
To: Michael Ellerman; +Cc: linuxppc-dev
On Tue, 2014-10-28 at 12:15 +1100, Michael Ellerman wrote:
> This reverts commit bf7588a0859580a45c63cb082825d77c13eca357.
>
> Ben says, "The original code was fine, I think the bug was actually in
> the userspace tool I was using (don't worry, nothing on the field uses
> that interface yet and I can still fix the tool)."
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
The original code wasn't fine actually :-) But the fix was completely
wrong and does more damages than it fixes things. So Ack the revert and
I'll sort things out properly later.
Cheers,
Ben.
> ---
> arch/powerpc/platforms/powernv/opal-lpc.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/opal-lpc.c b/arch/powerpc/platforms/powernv/opal-lpc.c
> index dd2c285ad170..ad4b31df779a 100644
> --- a/arch/powerpc/platforms/powernv/opal-lpc.c
> +++ b/arch/powerpc/platforms/powernv/opal-lpc.c
> @@ -191,7 +191,6 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf,
> {
> struct lpc_debugfs_entry *lpc = filp->private_data;
> u32 data, pos, len, todo;
> - __be32 bedata;
> int rc;
>
> if (!access_ok(VERIFY_WRITE, ubuf, count))
> @@ -214,10 +213,9 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf,
> len = 2;
> }
> rc = opal_lpc_read(opal_lpc_chip_id, lpc->lpc_type, pos,
> - &bedata, len);
> + &data, len);
> if (rc)
> return -ENXIO;
> - data = be32_to_cpu(bedata);
> switch(len) {
> case 4:
> rc = __put_user((u32)data, (u32 __user *)ubuf);
^ permalink raw reply [flat|nested] 2+ messages in thread
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