Hi Joseph,
> A bug was opened against the Ubuntu kernel[0]. It was found that
> reverting the following commit resolved this bug:
>
> commit 740fbddf5c3f9ad8b23c5d917ba1cc7e376a5104
> Author: Takahisa Tanaka <mc74hc00@xxxxxxxxx>
> Date: Sun Dec 2 14:33:18 2012 +0900
>
> watchdog: sp5100_tco: Add SB8x0 chipset support
>
>
> The regression was introduced as of v3.8-rc1.
>
> I see that you are the author of this patch, so I wanted to run this by
> you. I was thinking of requesting a revert for v3.8, but I wanted to
> get your feedback first.
Please check out the attached patches first (They are allready in linux-next).
Other references:
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176
Kind regards,
Wim.
>From mc74hc00@xxxxxxxxx Mon Jan 14 03:02:20 2013
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From: Takahisa Tanaka <mc74hc00@xxxxxxxxx>
To: linux-watchdog@xxxxxxxxxxxxxxx
Cc: Wim Van Sebroeck <wim@xxxxxxxxx>,
Paul Menzel <paulepanter@xxxxxxxxxxxxxxxxxxxxx>,
Arkadiusz Miskiewicz <arekm@xxxxxxxx>,
Bjorn Helgaas <bhelgaas@xxxxxxxxxx>,
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>,
Jonathan Nieder <jrnieder@xxxxxxxxx>,
linux-kernel@xxxxxxxxxxxxxxx,
Florian Mickler <florian@xxxxxxxxxxx>,
Takahisa Tanaka <mc74hc00@xxxxxxxxx>
Subject: [PATCH 1/2] watchdog: sp5100_tco: Fix wrong indirect I/O access for getting value of reserved bits
Date: Mon, 14 Jan 2013 11:01:57 +0900
Message-Id: <1358128918-4415-1-git-send-email-mc74hc00@xxxxxxxxx>
X-Mailer: git-send-email 1.7.11.7
Content-Length: 1656
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In case of SB800 or later chipset and re-programming MMIO address(*),
sp5100_tco module may read incorrect value of reserved bit, because the module
reads a value from an incorrect I/O address. However, this bug doesn't cause
a problem, because when re-programming MMIO address, by chance the module
writes zero (this is BIOS's default value) to the low three bits of register.
* In most cases, PC with SB8x0 or later chipset doesn't need to re-programming
MMIO address, because such PC can enable AcpiMmio and can use 0xfed80b00 for
watchdog register base address.
This patch fixes this bug.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176
Signed-off-by: Takahisa Tanaka <mc74hc00@xxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx>
---
drivers/watchdog/sp5100_tco.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 2b0e000..5dfe86e 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -500,14 +500,15 @@ static unsigned char sp5100_tco_setupdevice(void)
/* Restore to the low three bits, if chipset is SB8x0(or later) */
if (sp5100_tco_pci->revision >= 0x40) {
u8 reserved_bit;
- reserved_bit = inb(base_addr) & 0x7;
+ outb(base_addr+0, index_reg);
+ reserved_bit = inb(data_reg) & 0x7;
val |= (u32)reserved_bit;
}
/* Re-programming the watchdog timer base address */
outb(base_addr+0, index_reg);
/* Low three bits of BASE are reserved */
- outb((val >> 0) & 0xf8, data_reg);
+ outb((val >> 0) & 0xff, data_reg);
outb(base_addr+1, index_reg);
outb((val >> 8) & 0xff, data_reg);
outb(base_addr+2, index_reg);
--
1.7.11.7
>From mc74hc00@xxxxxxxxx Mon Jan 14 03:02:31 2013
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From: Takahisa Tanaka <mc74hc00@xxxxxxxxx>
To: linux-watchdog@xxxxxxxxxxxxxxx
Cc: Wim Van Sebroeck <wim@xxxxxxxxx>,
Paul Menzel <paulepanter@xxxxxxxxxxxxxxxxxxxxx>,
Arkadiusz Miskiewicz <arekm@xxxxxxxx>,
Bjorn Helgaas <bhelgaas@xxxxxxxxxx>,
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>,
Jonathan Nieder <jrnieder@xxxxxxxxx>,
linux-kernel@xxxxxxxxxxxxxxx,
Florian Mickler <florian@xxxxxxxxxxx>,
Takahisa Tanaka <mc74hc00@xxxxxxxxx>
Subject: [PATCH 2/2] watchdog: sp5100_tco: Write back the original value to reserved bits, instead of zero
Date: Mon, 14 Jan 2013 11:01:58 +0900
Message-Id: <1358128918-4415-2-git-send-email-mc74hc00@xxxxxxxxx>
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Content-Length: 2279
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In case of SP5100 or SB7x0 chipsets, the sp5100_tco module writes zero to
reserved bits. The module, however, shouldn't depend on specific default
value, and should perform a read-merge-write operation for the reserved
bits.
This patch makes the sp5100_tco module perform a read-merge-write operation
on all the chipset (sp5100, sb7x0, sb8x0 or later).
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176
Signed-off-by: Takahisa Tanaka <mc74hc00@xxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx>
---
drivers/watchdog/sp5100_tco.c | 28 ++++++++--------------------
1 file changed, 8 insertions(+), 20 deletions(-)
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 5dfe86e..e3b8f75 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -361,7 +361,7 @@ static unsigned char sp5100_tco_setupdevice(void)
{
struct pci_dev *dev = NULL;
const char *dev_name = NULL;
- u32 val;
+ u32 val, tmp_val;
u32 index_reg, data_reg, base_addr;
/* Match the PCI device */
@@ -497,31 +497,19 @@ static unsigned char sp5100_tco_setupdevice(void)
pr_debug("Got 0x%04x from resource tree\n", val);
}
- /* Restore to the low three bits, if chipset is SB8x0(or later) */
- if (sp5100_tco_pci->revision >= 0x40) {
- u8 reserved_bit;
- outb(base_addr+0, index_reg);
- reserved_bit = inb(data_reg) & 0x7;
- val |= (u32)reserved_bit;
- }
+ /* Restore to the low three bits */
+ outb(base_addr+0, index_reg);
+ tmp_val = val | (inb(data_reg) & 0x7);
/* Re-programming the watchdog timer base address */
outb(base_addr+0, index_reg);
- /* Low three bits of BASE are reserved */
- outb((val >> 0) & 0xff, data_reg);
+ outb((tmp_val >> 0) & 0xff, data_reg);
outb(base_addr+1, index_reg);
- outb((val >> 8) & 0xff, data_reg);
+ outb((tmp_val >> 8) & 0xff, data_reg);
outb(base_addr+2, index_reg);
- outb((val >> 16) & 0xff, data_reg);
+ outb((tmp_val >> 16) & 0xff, data_reg);
outb(base_addr+3, index_reg);
- outb((val >> 24) & 0xff, data_reg);
-
- /*
- * Clear unnecessary the low three bits,
- * if chipset is SB8x0(or later)
- */
- if (sp5100_tco_pci->revision >= 0x40)
- val &= ~0x7;
+ outb((tmp_val >> 24) & 0xff, data_reg);
if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
dev_name)) {
--
1.7.11.7
