Is NAND MTD preemption safe?

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* Is NAND MTD preemption safe?
@ 2006-09-06  8:37 Ronny L Nilsson
  2006-09-28  0:06 ` Thomas Gleixner
  0 siblings, 1 reply; 2+ messages in thread
From: Ronny L Nilsson @ 2006-09-06  8:37 UTC (permalink / raw)
  To: linux-mtd

Hi
I have a question about MTD, NAND and race conditions. Basically I'm 
wondering if the NAND support in MTD is preemption safe?

Scenario:
1) A NAND chip is splited in multiple partitions.

2) On each partition (/dev/mtdblockX) is a filesystem.

3) If one filesystem performs a write in the NAND chip, will the other 
filesystems temporarily be lock out? If preemption is enabled in the 
kernel I suspect races might otherwise occur (since addressing and 
command cycles of NANDS are quite lengthy).

Regards
/Ronny Nilsson

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: Is NAND MTD preemption safe?
  2006-09-06  8:37 Is NAND MTD preemption safe? Ronny L Nilsson
@ 2006-09-28  0:06 ` Thomas Gleixner
  0 siblings, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2006-09-28  0:06 UTC (permalink / raw)
  To: Ronny L Nilsson; +Cc: linux-mtd

On Wed, 2006-09-06 at 10:37 +0200, Ronny L Nilsson wrote:
> Hi
> I have a question about MTD, NAND and race conditions. Basically I'm 
> wondering if the NAND support in MTD is preemption safe?

Care to read the code ?

All chip access functions have been serialized by nand_get_device() and
nand_release_device() forever.

	tglx

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2006-09-06  8:37 Is NAND MTD preemption safe? Ronny L Nilsson
2006-09-28  0:06 ` Thomas Gleixner

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