mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 22:02:02 +00:00
Code Issues Releases Wiki Activity

spi: dw: Unmask IRQs after enabling the chip

Browse source 
It's theoretically erroneous to enable IRQ before the chip is turned on.
If IRQ handler gets executed before the chip is enabled, then any data
written to the Tx FIFO will be just ignored.

I say "theoretically" because we haven't noticed any problem with that,
but let's fix it anyway just in case...

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20201007235511.4935-12-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Serge Semin 2020-10-08 02:55:00 +03:00 committed by Mark Brown
parent 82d02944d2
commit da8f58909e
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/spi/spi-dw-core.c
View file

@ -376,8 +376,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
spi_enable_chip(dws, 1);
return ret;
}
} else {
dw_spi_irq_setup(dws);
}
spi_enable_chip(dws, 1);
@ -385,6 +383,8 @@ static int dw_spi_transfer_one(struct spi_controller *master,
if (dws->dma_mapped)
return dws->dma_ops->dma_transfer(dws, transfer);
dw_spi_irq_setup(dws);
return 1;
}