This is a note to let you know that I've just added the patch titled
p2sb: Introduce the global flag p2sb_hidden_by_bios
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
p2sb-introduce-the-global-flag-p2sb_hidden_by_bios.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1da75876350e6c54be662f7dbf00e4b2261190e8
Author: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Date: Thu Nov 28 09:28:34 2024 +0900
p2sb: Introduce the global flag p2sb_hidden_by_bios
[ Upstream commit ae3e6ebc5ab046d434c05c58a3e3f7e94441fec2 ]
To prepare for the following fix, introduce the global flag
p2sb_hidden_by_bios. Check if the BIOS hides the P2SB device and store
the result in the flag. This allows to refer to the check result across
functions.
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241128002836.373745-3-shinichiro.kawasaki@xxxxxxx
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Stable-dep-of: 360c400d0f56 ("p2sb: Do not scan and remove the P2SB device when it is unhidden")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/platform/x86/p2sb.c b/drivers/platform/x86/p2sb.c
index aa34b8a69bc1..273ac90c8fbd 100644
--- a/drivers/platform/x86/p2sb.c
+++ b/drivers/platform/x86/p2sb.c
@@ -42,6 +42,7 @@ struct p2sb_res_cache {
};
static struct p2sb_res_cache p2sb_resources[NR_P2SB_RES_CACHE];
+static bool p2sb_hidden_by_bios;
static void p2sb_get_devfn(unsigned int *devfn)
{
@@ -157,13 +158,14 @@ static int p2sb_cache_resources(void)
* Unhide the P2SB device here, if needed.
*/
pci_bus_read_config_dword(bus, devfn_p2sb, P2SBC, &value);
- if (value & P2SBC_HIDE)
+ p2sb_hidden_by_bios = value & P2SBC_HIDE;
+ if (p2sb_hidden_by_bios)
pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, 0);
ret = p2sb_scan_and_cache(bus, devfn_p2sb);
/* Hide the P2SB device, if it was hidden */
- if (value & P2SBC_HIDE)
+ if (p2sb_hidden_by_bios)
pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, P2SBC_HIDE);
pci_unlock_rescan_remove();
