linux-kernel - [PATCH 237/241] i82975x_edac: Fix dimm label initialization

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Message-Id: <1355407206-17100-238-git-send-email-herton.krzesinski@canonical.com>
Date:	Thu, 13 Dec 2012 12:00:02 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 237/241] i82975x_edac: Fix dimm label initialization

3.5.7.2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mauro Carvalho Chehab <mchehab@...hat.com>

commit 479696840239e0cc43efb3c917bdcad2174d2215 upstream.

The driver has only 4 hardcoded labels, but allows much more memory.
Fix it by removing the hardcoded logic, using snprintf() instead.

[   19.833972] general protection fault: 0000 [#1] SMP
[   19.837733] Modules linked in: i82975x_edac(+) edac_core firewire_ohci firewire_core crc_itu_t nouveau mxm_wmi wmi video i2c_algo_bit drm_kms_helper ttm drm i2c_core
[   19.837733] CPU 0
[   19.837733] Pid: 390, comm: udevd Not tainted 3.6.1-1.fc17.x86_64.debug #1 Dell Inc.                 Precision WorkStation 390    /0MY510
[   19.837733] RIP: 0010:[<ffffffff813463a8>]  [<ffffffff813463a8>] strncpy+0x18/0x30
[   19.837733] RSP: 0018:ffff880078535b68  EFLAGS: 00010202
[   19.837733] RAX: ffff880069fa9708 RBX: ffff880078588000 RCX: ffff880069fa9708
[   19.837733] RDX: 000000000000001f RSI: 5f706f5f63616465 RDI: ffff880069fa9708
[   19.837733] RBP: ffff880078535b68 R08: ffff880069fa9727 R09: 000000000000fffe
[   19.837733] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003
[   19.837733] R13: 0000000000000000 R14: ffff880069fa9290 R15: ffff880079624a80
[   19.837733] FS:  00007f3de01ee840(0000) GS:ffff88007c400000(0000) knlGS:0000000000000000
[   19.837733] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.837733] CR2: 00007f3de00b9000 CR3: 0000000078dbc000 CR4: 00000000000007f0
[   19.837733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.837733] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   19.837733] Process udevd (pid: 390, threadinfo ffff880078534000, task ffff880079642450)
[   19.837733] Stack:
[   19.837733]  ffff880078535c18 ffffffffa017c6b8 00040000816d627f ffff880079624a88
[   19.837733]  ffffc90004cd6000 ffff880079624520 ffff88007ac21148 0000000000000000
[   19.837733]  0000000000000000 0004000000000000 feda000078535bc8 ffffffff810d696d
[   19.837733] Call Trace:
[   19.837733]  [<ffffffffa017c6b8>] i82975x_init_one+0x2e6/0x3e6 [i82975x_edac]
...

Fix bug reported at:
	https://bugzilla.redhat.com/show_bug.cgi?id=848149
And, very likely:
	https://bbs.archlinux.org/viewtopic.php?id=148033
	https://bugzilla.kernel.org/show_bug.cgi?id=47171

Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
[ herton: keep original strncpy arguments (use ...channels[chan].dimm->label ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/edac/i82975x_edac.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/i82975x_edac.c b/drivers/edac/i82975x_edac.c
index 433332c..837ccc5 100644
--- a/drivers/edac/i82975x_edac.c
+++ b/drivers/edac/i82975x_edac.c
@@ -370,10 +370,6 @@ static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
 static void i82975x_init_csrows(struct mem_ctl_info *mci,
 		struct pci_dev *pdev, void __iomem *mch_window)
 {
-	static const char *labels[4] = {
-							"DIMM A1", "DIMM A2",
-							"DIMM B1", "DIMM B2"
-						};
 	struct csrow_info *csrow;
 	unsigned long last_cumul_size;
 	u8 value;
@@ -424,9 +420,10 @@ static void i82975x_init_csrows(struct mem_ctl_info *mci,
 			dimm = mci->csrows[index].channels[chan].dimm;
 
 			dimm->nr_pages = nr_pages / csrow->nr_channels;
-			strncpy(csrow->channels[chan].dimm->label,
-					labels[(index >> 1) + (chan * 2)],
-					EDAC_MC_LABEL_LEN);
+
+			snprintf(csrow->channels[chan].dimm->label, EDAC_MC_LABEL_LEN, "DIMM %c%d",
+				 (chan == 0) ? 'A' : 'B',
+				 index);
 			dimm->grain = 1 << 7;	/* 128Byte cache-line resolution */
 			dimm->dtype = i82975x_dram_type(mch_window, index);
 			dimm->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
-- 
1.7.9.5

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