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EDAC/altera: Use fast register IO for S10 IRQs

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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: 3dab6bd526 ("EDAC, altera: Add support for Stratix10 SDRAM EDAC")
Reported-by: Meng Li <[email protected]>
Signed-off-by: Meng Li <[email protected]>
Signed-off-by: Thor Thayer <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: James Morse <[email protected]>
Cc: linux-edac <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: stable <[email protected]>
Cc: Tony Luck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Meng Li 2019-11-21 12:30:46 -06:00 • committed by Greg Kroah-Hartman
commit dc69bd2393
1 changed files with 1 additions and 0 deletions
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1
drivers/edac/altera_edac.c
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@ -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> ***********/