4.4-stable review patch. If anyone has any objections, please let me know.
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From: Marek Vasut marex@denx.de
[ Upstream commit 400c18e3dc86e04ef5afec9b86a8586ca629b9e9 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/spi/spi-dw-mmio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -120,8 +120,8 @@ static int dw_spi_mmio_remove(struct pla { struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev);
- clk_disable_unprepare(dwsmmio->clk); dw_spi_remove_host(&dwsmmio->dws); + clk_disable_unprepare(dwsmmio->clk);
return 0; }