[PATCH] mtd: ubi: io: add retries mtd_write

[Sean Nyekjaer]

On Wed, Sep 01, 2021 at 10:56:37AM +0200, Sean Nyekjaer wrote:
> Fix "Device or resource busy" when resuming from suspend. Sometimes ubi
> tries to call mtd_write before the rawnand is resumed.
> 
> So add 3 retries to the mtd_write call:
> PM: suspend devices took 0.030 seconds
> ubi0 warning: ubi_io_write: error -16 while writing 4096 bytes to PEB 1762:94208, written 0 bytes
> Disabling non-boot CPUs ...
> ubi0 warning: ubi_io_write: error -16 while writing 4096 bytes to PEB 1762:94208, written 0 bytes
> ubi0 warning: ubi_io_write: error -16 while writing 4096 bytes to PEB 1762:94208, written 0 bytes
> PM: resume devices took 0.110 seconds
> OOM killer enabled.
> Restarting tasks ... done.
> PM: suspend exit
> 
> Signed-off-by: Sean Nyekjaer <sean at geanix.com>
> ---
> 
> Some explanation/discussion here:
> http://lists.infradead.org/pipermail/linux-mtd/2021-July/087390.html
> 

This is still an issue... Anyway to block ubi from accessing a suspended
rawnand?

Richard do you have an idea to solve this?

/Sean