spi: dw: Disable clock after unregistering the host
authorMarek Vasut <marex@denx.de>
Tue, 18 Apr 2017 18:09:06 +0000 (20:09 +0200)
committerMark Brown <broonie@kernel.org>
Tue, 18 Apr 2017 18:16:49 +0000 (19:16 +0100)
commit400c18e3dc86e04ef5afec9b86a8586ca629b9e9
treef598d12dc23205ecdeeaccc284cfe85a474d177a
parentfafd67940774733fa97f4b09412aea6981b82e0a
spi: dw: Disable clock after unregistering the host

The dw_mmio driver disables the block clock before unregistering
the host. The code unregistering the host may access the SPI block
registers. If register access happens with block clock disabled,
this may lead to a bus hang. Disable the clock after unregistering
the host to prevent such situation.

This bug was observed on Altera Cyclone V SoC.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-dw-mmio.c