| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.3 042/180] EDAC/altera: Use fast register IO for S10 IRQs | Date | Mon, 16 Dec 2019 18:48:02 +0100 |
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From: Meng Li <Meng.Li@windriver.com>
commit 56d9e7bd3fa0f105b6670021d167744bc50ae4fe upstream.
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@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/edac/altera_edac.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -561,6 +561,7 @@ static const struct regmap_config s10_sd .reg_write = s10_protected_reg_write, .use_single_read = true, .use_single_write = true, + .fast_io = true, }; /************** </Stratix10 EDAC Memory Controller Functions> ***********/
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