The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 56d9e7bd3fa0f105b6670021d167744bc50ae4fe Mon Sep 17 00:00:00 2001
From: Meng Li <Meng.Li@xxxxxxxxxxxxx>
Date: Thu, 21 Nov 2019 12:30:46 -0600
Subject: [PATCH] EDAC/altera: Use fast register IO for S10 IRQs
When an IRQ occurs, regmap_{read,write,...}() is invoked in atomic
context. Regmap must indicate register IO is fast so that a spinlock is
used instead of a mutex to avoid sleeping in atomic context:
lock_acquire
__mutex_lock
mutex_lock_nested
regmap_lock_mutex
regmap_write
a10_eccmgr_irq_unmask
unmask_irq.part.0
irq_enable
__irq_startup
irq_startup
__setup_irq
request_threaded_irq
devm_request_threaded_irq
altr_sdram_probe
Mark it so.
[ bp: Massage. ]
Fixes: 3dab6bd52687 ("EDAC, altera: Add support for Stratix10 SDRAM EDAC")
Reported-by: Meng Li <Meng.Li@xxxxxxxxxxxxx>
Signed-off-by: Meng Li <Meng.Li@xxxxxxxxxxxxx>
Signed-off-by: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: linux-edac <linux-edac@xxxxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Robert Richter <rrichter@xxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Link: https://lkml.kernel.org/r/1574361048-17572-2-git-send-email-thor.thayer@xxxxxxxxxxxxxxx
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index fbda4b876afd..0be3d1b17f03 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -560,6 +560,7 @@ static const struct regmap_config s10_sdram_regmap_cfg = {
.reg_write = s10_protected_reg_write,
.use_single_read = true,
.use_single_write = true,
+ .fast_io = true,
};
/************** </Stratix10 EDAC Memory Controller Functions> ***********/
