From: Muralidhara M K <muralidhara.mk@amd.com>
To: <ilpo.jarvinen@linux.intel.com>
Cc: <platform-driver-x86@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <muthusamy.ramalingam@amd.com>,
Muralidhara M K <muralidhara.mk@amd.com>
Subject: [PATCH v5 4/6] platform/x86/amd/hsmp: Clear mdev.this_device on deregister
Date: Fri, 10 Jul 2026 20:16:31 +0530 [thread overview]
Message-ID: <20260710144633.879018-5-muralidhara.mk@amd.com> (raw)
In-Reply-To: <20260710144633.879018-1-muralidhara.mk@amd.com>
misc_deregister() destroys the device but leaves miscdevice.this_device
pointing at the freed struct device. Clear it so any later check of
this_device, and a subsequent re-register, does not observe a stale
pointer. An upcoming change uses this_device to track whether /dev/hsmp is
registered across the shared ACPI sockets and relies on it being NULL after
deregister.
Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
---
drivers/platform/x86/amd/hsmp/hsmp.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/platform/x86/amd/hsmp/hsmp.c b/drivers/platform/x86/amd/hsmp/hsmp.c
index fd36c8f142c0..584fd9b1d31f 100644
--- a/drivers/platform/x86/amd/hsmp/hsmp.c
+++ b/drivers/platform/x86/amd/hsmp/hsmp.c
@@ -539,6 +539,7 @@ EXPORT_SYMBOL_NS_GPL(hsmp_misc_register, "AMD_HSMP");
void hsmp_misc_deregister(void)
{
misc_deregister(&hsmp_pdev.mdev);
+ hsmp_pdev.mdev.this_device = NULL;
}
EXPORT_SYMBOL_NS_GPL(hsmp_misc_deregister, "AMD_HSMP");
--
2.34.1
next prev parent reply other threads:[~2026-07-10 14:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-10 14:46 [PATCH v5 0/6] platform/x86/amd/hsmp: Serialize the data plane against socket teardown Muralidhara M K
2026-07-10 14:46 ` [PATCH v5 1/6] platform/x86/amd/hsmp: Serialize ACPI HSMP probe and remove with an rwsem Muralidhara M K
2026-07-10 14:46 ` [PATCH v5 2/6] platform/x86/amd/hsmp: Map the metric table with ioremap() and unmap it explicitly Muralidhara M K
2026-07-10 14:46 ` [PATCH v5 3/6] platform/x86/amd/hsmp: Serialize per-socket metric table reads with a mutex Muralidhara M K
2026-07-10 14:46 ` Muralidhara M K [this message]
2026-07-10 14:46 ` [PATCH v5 5/6] platform/x86/amd/hsmp: ACPI HSMP refcounted sockets and coordinated release Muralidhara M K
2026-07-10 17:51 ` Ilpo Järvinen
2026-07-12 3:13 ` M K, Muralidhara
2026-07-10 14:46 ` [PATCH v5 6/6] platform/x86/amd/hsmp: Serialize the data plane against socket teardown Muralidhara M K
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=20260710144633.879018-5-muralidhara.mk@amd.com \
--to=muralidhara.mk@amd.com \
--cc=ilpo.jarvinen@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=muthusamy.ramalingam@amd.com \
--cc=platform-driver-x86@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox