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@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 56d9e7bd3fa0f105b6670021d167744bc50ae4fe Mon Sep 17 00:00:00 2001

From: Meng Li Meng.Li@windriver.com 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@windriver.com Signed-off-by: Meng Li Meng.Li@windriver.com Signed-off-by: Thor Thayer thor.thayer@linux.intel.com Signed-off-by: Borislav Petkov bp@suse.de Cc: James Morse james.morse@arm.com Cc: linux-edac linux-edac@vger.kernel.org Cc: Mauro Carvalho Chehab mchehab@kernel.org Cc: Robert Richter rrichter@marvell.com Cc: stable stable@vger.kernel.org Cc: Tony Luck tony.luck@intel.com Link: https://lkml.kernel.org/r/1574361048-17572-2-git-send-email-thor.thayer@linu...

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> ***********/