From: "Dr. David Alan Gilbert" <linux@treblig.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Hardware Monitoring <linux-hwmon@vger.kernel.org>,
Jean Delvare <jdelvare@suse.com>, Meelis Roos <mroos@linux.ee>
Subject: Re: [PATCH] hwmon: (w83627ehf) Fix crash seen with W83627DHG-P
Date: Thu, 20 Feb 2020 20:16:42 +0000 [thread overview]
Message-ID: <20200220201642.GD18071@gallifrey> (raw)
In-Reply-To: <20200220143744.10278-1-linux@roeck-us.net>
* Guenter Roeck (linux@roeck-us.net) wrote:
> Loading the driver on a system with W83627DHG-P crashes as follows.
>
> w83627ehf: Found W83627DHG-P chip at 0x290
> BUG: kernel NULL pointer dereference, address: 0000000000000000
> PGD 0 P4D 0
> Oops: 0000 [#1] SMP NOPTI
> CPU: 0 PID: 604 Comm: sensors Not tainted 5.6.0-rc2-00055-gca7e1fd1026c #29
> Hardware name: /D425KT, BIOS MWPNT10N.86A.0132.2013.0726.1534 07/26/2013
> RIP: 0010:w83627ehf_read_string+0x27/0x70 [w83627ehf]
> Code: [... ]
> RSP: 0018:ffffb95980657df8 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff96caaa7f5218 RCX: 0000000000000000
> RDX: 0000000000000015 RSI: 0000000000000001 RDI: ffff96caa736ec08
> RBP: 0000000000000000 R08: ffffb95980657e20 R09: 0000000000000001
> R10: ffff96caaa635cc0 R11: 0000000000000000 R12: ffff96caa9f7cf00
> R13: ffff96caa9ec3d00 R14: ffff96caa9ec3d28 R15: ffff96caa9ec3d40
> FS: 00007fbc7c4e2740(0000) GS:ffff96caabc00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 0000000129d58000 CR4: 00000000000006f0
> Call Trace:
> ? cp_new_stat+0x12d/0x160
> hwmon_attr_show_string+0x37/0x70 [hwmon]
> dev_attr_show+0x14/0x50
> sysfs_kf_seq_show+0xb5/0x1b0
> seq_read+0xcf/0x460
> vfs_read+0x9b/0x150
> ksys_read+0x5f/0xe0
> do_syscall_64+0x48/0x190
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> ...
>
> Temperature labels are not always present. Adjust sysfs attribute
> visibility accordingly.
>
> Reported-by: Meelis Roos <mroos@linux.ee>
> Cc: Meelis Roos <mroos@linux.ee>
> Cc: Dr. David Alan Gilbert <linux@treblig.org>
> Fixes: 266cd5835947 ("hwmon: (w83627ehf) convert to with_info interface")
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
> ---
> drivers/hwmon/w83627ehf.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
> index 7ffadc2da57b..5a5120121e50 100644
> --- a/drivers/hwmon/w83627ehf.c
> +++ b/drivers/hwmon/w83627ehf.c
> @@ -1346,8 +1346,13 @@ w83627ehf_is_visible(const void *drvdata, enum hwmon_sensor_types type,
> /* channel 0.., name 1.. */
> if (!(data->have_temp & (1 << channel)))
> return 0;
> - if (attr == hwmon_temp_input || attr == hwmon_temp_label)
> + if (attr == hwmon_temp_input)
> return 0444;
> + if (attr == hwmon_temp_label) {
> + if (data->temp_label)
> + return 0444;
> + return 0;
> + }
> if (channel == 2 && data->temp3_val_only)
> return 0;
> if (attr == hwmon_temp_max) {
> --
> 2.17.1
>
--
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \
\ dave @ treblig.org | | In Hex /
\ _________________________|_____ http://www.treblig.org |_______/
next prev parent reply other threads:[~2020-02-20 20:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 14:37 [PATCH] hwmon: (w83627ehf) Fix crash seen with W83627DHG-P Guenter Roeck
2020-02-20 20:16 ` Dr. David Alan Gilbert [this message]
2020-02-20 20:39 ` Guenter Roeck
2020-02-21 14:59 ` Dr. David Alan Gilbert
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200220201642.GD18071@gallifrey \
--to=linux@treblig.org \
--cc=jdelvare@suse.com \
--cc=linux-hwmon@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=mroos@linux.ee \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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.