On Tue, 2012-04-17 at 15:49 +0200, Janusz Krzysztofik wrote: > A call to request_mem_region() has been introduced in the omap-gpio > driver recently (commit 96751fcbe5438e95514b025e9cee7a6d38038f40, > "gpio/omap: Use devm_ API and add request_mem_region"). This change > prevented the Amstrad Delta NAND driver, which was doing the same in > order to take control over OMAP MPU I/O lines that the NAND device hangs > off, from loading successfully. > > There is another driver, omap-keypad, which also manipulates OMAP MPUIO > registers, but has never been calling request_mem_region() on startup, > so it's not affected by the change in the gpio-omap and works correctly. > > Drop request_mem_region() call and related bits from ams-delta NAND > driver. > > Created and tested against linux-3.4-rc3. > > Signed-off-by: Janusz Krzysztofik <[email protected]>
How about race conditions? Where is the guarantee that these 2 drivers won't affect each other when doing I/O at the same time to the same HW resources? -- Best Regards, Artem Bityutskiy
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