* [PATCH 1/2] powerpc/fadump: return 0 on re-registration
@ 2017-06-26 14:06 Michal Suchanek
2017-06-26 14:06 ` [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store Michal Suchanek
2017-06-27 9:30 ` [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchánek
0 siblings, 2 replies; 5+ messages in thread
From: Michal Suchanek @ 2017-06-26 14:06 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Hari Bathini, Mahesh Salgaonkar, Andrew Morton, Michal Suchanek,
Colin Ian King, linuxppc-dev, linux-kernel
When fadump is already registered return success.
Currently EEXIST is returned which is difficult to handle race-free in
userspace when shell scripts are used. If multiple writers are trying to
write '1' there is no difference in whichever succeeds so just return 0
to all.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/fadump.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 436aedf195ab..5a7355381dac 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1214,7 +1214,6 @@ static ssize_t fadump_register_store(struct kobject *kobj,
break;
case '1':
if (fw_dump.dump_registered == 1) {
- ret = -EEXIST;
goto unlock_out;
}
/* Register Firmware-assisted dump */
--
2.10.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store
2017-06-26 14:06 [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchanek
@ 2017-06-26 14:06 ` Michal Suchanek
2017-11-12 17:30 ` Hari Bathini
2017-11-14 11:11 ` [2/2] " Michael Ellerman
2017-06-27 9:30 ` [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchánek
1 sibling, 2 replies; 5+ messages in thread
From: Michal Suchanek @ 2017-06-26 14:06 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Hari Bathini, Mahesh Salgaonkar, Andrew Morton, Michal Suchanek,
Colin Ian King, linuxppc-dev, linux-kernel
Currently sysfs store handlers in fadump use if buf[0] == 'char'.
This means input "100foo" is interpreted as '1' and "01" as '0'.
Change to kstrtoint so leading zeroes and the like is handled in
expected way.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/fadump.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 5a7355381dac..241eff0b5f76 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1161,10 +1161,15 @@ static ssize_t fadump_release_memory_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
+ int input = -1;
+
if (!fw_dump.dump_active)
return -EPERM;
- if (buf[0] == '1') {
+ if (kstrtoint(buf, 0, &input))
+ return -EINVAL;
+
+ if (input == 1) {
/*
* Take away the '/proc/vmcore'. We are releasing the dump
* memory, hence it will not be valid anymore.
@@ -1198,21 +1203,25 @@ static ssize_t fadump_register_store(struct kobject *kobj,
const char *buf, size_t count)
{
int ret = 0;
+ int input = -1;
if (!fw_dump.fadump_enabled || fdm_active)
return -EPERM;
+ if (kstrtoint(buf, 0, &input))
+ return -EINVAL;
+
mutex_lock(&fadump_mutex);
- switch (buf[0]) {
- case '0':
+ switch (input) {
+ case 0:
if (fw_dump.dump_registered == 0) {
goto unlock_out;
}
/* Un-register Firmware-assisted dump */
fadump_unregister_dump(&fdm);
break;
- case '1':
+ case 1:
if (fw_dump.dump_registered == 1) {
goto unlock_out;
}
--
2.10.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] powerpc/fadump: return 0 on re-registration
2017-06-26 14:06 [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchanek
2017-06-26 14:06 ` [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store Michal Suchanek
@ 2017-06-27 9:30 ` Michal Suchánek
1 sibling, 0 replies; 5+ messages in thread
From: Michal Suchánek @ 2017-06-27 9:30 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Hari Bathini, Mahesh Salgaonkar, Andrew Morton, Michal Suchanek,
Colin Ian King, linuxppc-dev, linux-kernel
On Mon, 26 Jun 2017 16:06:00 +0200
Michal Suchanek <msuchanek@suse.de> wrote:
> When fadump is already registered return success.
>
> Currently EEXIST is returned which is difficult to handle race-free in
> userspace when shell scripts are used. If multiple writers are trying
> to write '1' there is no difference in whichever succeeds so just
> return 0 to all.
>
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
> ---
> arch/powerpc/kernel/fadump.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/fadump.c
> b/arch/powerpc/kernel/fadump.c index 436aedf195ab..5a7355381dac 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -1214,7 +1214,6 @@ static ssize_t fadump_register_store(struct
> kobject *kobj, break;
> case '1':
> if (fw_dump.dump_registered == 1) {
> - ret = -EEXIST;
> goto unlock_out;
> }
> /* Register Firmware-assisted dump */
Forget about this one.
It breaks another case when fadump is registered and you need to
re-register to account for change in system configuration.
Thanks
Michal
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store
2017-06-26 14:06 ` [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store Michal Suchanek
@ 2017-11-12 17:30 ` Hari Bathini
2017-11-14 11:11 ` [2/2] " Michael Ellerman
1 sibling, 0 replies; 5+ messages in thread
From: Hari Bathini @ 2017-11-12 17:30 UTC (permalink / raw)
To: Michal Suchanek, Benjamin Herrenschmidt, Paul Mackerras,
Michael Ellerman, Mahesh Salgaonkar, Andrew Morton,
Colin Ian King, linuxppc-dev, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1892 bytes --]
Thanks for the patch, Michal.
On Monday 26 June 2017 07:36 PM, Michal Suchanek wrote:
> Currently sysfs store handlers in fadump use if buf[0] == 'char'.
>
> This means input "100foo" is interpreted as '1' and "01" as '0'.
>
> Change to kstrtoint so leading zeroes and the like is handled in
> expected way.
>
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Acked-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
> ---
> arch/powerpc/kernel/fadump.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index 5a7355381dac..241eff0b5f76 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -1161,10 +1161,15 @@ static ssize_t fadump_release_memory_store(struct kobject *kobj,
> struct kobj_attribute *attr,
> const char *buf, size_t count)
> {
> + int input = -1;
> +
> if (!fw_dump.dump_active)
> return -EPERM;
>
> - if (buf[0] == '1') {
> + if (kstrtoint(buf, 0, &input))
> + return -EINVAL;
> +
> + if (input == 1) {
> /*
> * Take away the '/proc/vmcore'. We are releasing the dump
> * memory, hence it will not be valid anymore.
> @@ -1198,21 +1203,25 @@ static ssize_t fadump_register_store(struct kobject *kobj,
> const char *buf, size_t count)
> {
> int ret = 0;
> + int input = -1;
>
> if (!fw_dump.fadump_enabled || fdm_active)
> return -EPERM;
>
> + if (kstrtoint(buf, 0, &input))
> + return -EINVAL;
> +
> mutex_lock(&fadump_mutex);
>
> - switch (buf[0]) {
> - case '0':
> + switch (input) {
> + case 0:
> if (fw_dump.dump_registered == 0) {
> goto unlock_out;
> }
> /* Un-register Firmware-assisted dump */
> fadump_unregister_dump(&fdm);
> break;
> - case '1':
> + case 1:
> if (fw_dump.dump_registered == 1) {
> goto unlock_out;
> }
[-- Attachment #2: Type: text/html, Size: 2472 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [2/2] powerpc/fadump: use kstrtoint to handle sysfs store
2017-06-26 14:06 ` [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store Michal Suchanek
2017-11-12 17:30 ` Hari Bathini
@ 2017-11-14 11:11 ` Michael Ellerman
1 sibling, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2017-11-14 11:11 UTC (permalink / raw)
To: Michal Suchanek, Benjamin Herrenschmidt, Paul Mackerras,
Hari Bathini, Mahesh Salgaonkar, Andrew Morton, Michal Suchanek,
Colin Ian King, linuxppc-dev, linux-kernel
On Mon, 2017-06-26 at 14:06:01 UTC, Michal Suchanek wrote:
> Currently sysfs store handlers in fadump use if buf[0] == 'char'.
>
> This means input "100foo" is interpreted as '1' and "01" as '0'.
>
> Change to kstrtoint so leading zeroes and the like is handled in
> expected way.
>
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
> Acked-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
> Signed-off-by: Michal Suchanek <a class="moz-txt-link-rfc2396E" href="mailto:msuchanek@suse.de"><msuchanek@suse.de></a></pre>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/dcdc46794b7bb76733d9792cca2f45
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2017-11-14 11:12 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-06-26 14:06 [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchanek
2017-06-26 14:06 ` [PATCH 2/2] powerpc/fadump: use kstrtoint to handle sysfs store Michal Suchanek
2017-11-12 17:30 ` Hari Bathini
2017-11-14 11:11 ` [2/2] " Michael Ellerman
2017-06-27 9:30 ` [PATCH 1/2] powerpc/fadump: return 0 on re-registration Michal Suchánek
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.