[PATCH 24/28] EDAC/thunderx: Fix stale error context in thunderx_l2c_threaded_isr()

thunderx_l2c_threaded_isr() computes "tail" and "ctx" once before entering
the loop that drains the L2C error ring, and never updates them on
subsequent iterations. When multiple errors are queued, every iteration
reports the first ring entry rather than advancing through the ring,
causing subsequent hardware errors in a batch to go unreported.

Recompute "tail" and "ctx" at the start of each loop iteration, matching
the sibling thunderx_ocx_com_threaded_isr() and
thunderx_ocx_lnk_threaded_isr() handlers.

Fixes: 41003396f932 ("EDAC, thunderx: Add Cavium ThunderX EDAC driver")
Signed-off-by: Bill Wendling <morbo@google.com>
---
Cc: Russell King <linux@armlinux.org.uk>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
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Cc: Matthias Schwarzott <zzam@gentoo.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
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Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
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Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Peter Griffin <peter.griffin@linaro.org>
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Cc: Linus Walleij <linusw@kernel.org>
Cc: Anil Gurumurthy <anil.gurumurthy@qlogic.com>
Cc: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
Cc: "Martin K. Petersen" <mkp@kernel.org>
Cc: Trond Myklebust <trondmy@kernel.org>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Mike Marshall <hubcap@omnibond.com>
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Cc: Kees Cook <kees@kernel.org>
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Cc: Simon Horman <horms@kernel.org>
Cc: Chuck Lever <cel@kernel.org>
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Cc: Olga Kornievskaia <okorniev@redhat.com>
Cc: Dai Ngo <Dai.Ngo@oracle.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Cc: Kanglong Wang <redacted>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Qiang Ma <redacted>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Pengpeng Hou <redacted>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Breno Leitao <leitao@debian.org>
Cc: Thorsten Blum <blum@kernel.org>
Cc: Harshit Mogalapalli <redacted>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Ashutosh Desai <redacted>
Cc: Imre Deak <redacted>
Cc: Dmitry Baryshkov <redacted>
Cc: Johan Hovold <johan@kernel.org>
Cc: Johannes Berg <redacted>
Cc: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Cc: Alexander Stein <redacted>
Cc: Cryolitia PukNgae <cryolitia@uniontech.com>
Cc: Jiaming Zhang <redacted>
Cc: Will Porter <redacted>
Cc: Cen Zhang <redacted>
Cc: "Cássio Gabriel" <redacted>
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Cc: linux-mips@vger.kernel.org
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Cc: linux-edac@vger.kernel.org
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---
 drivers/edac/thunderx_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c
index 9c0a1e48f96f..e7c335ca0c36 100644
--- a/drivers/edac/thunderx_edac.c
+++ b/drivers/edac/thunderx_edac.c

@@ -1880,6 +1880,9 @@ static irqreturn_t thunderx_l2c_threaded_isr(int irq, void *irq_id)
 
 	while (CIRC_CNT(l2c->ring_head, l2c->ring_tail,
 			ARRAY_SIZE(l2c->err_ctx))) {
+		tail = ring_pos(l2c->ring_tail, ARRAY_SIZE(l2c->err_ctx));
+		ctx = &l2c->err_ctx[tail];
+
 		snprintf(msg, L2C_MESSAGE_SIZE,
 			 "%s: %s: %016llx, %s: %016llx",
 			 l2c->edac_dev->ctl_name, reg_int_name, ctx->reg_int,

-- 
2.55.0.1032.g73a4cd73de-goog