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driver core: initialize a default DMA mask for platform device

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We still treat devices without a DMA mask as defaulting to 32-bits for
both mask, but a few releases ago we've started warning about such
cases, as they require special cases to work around this sloppyness.
Add a dma_mask field to struct platform_device so that we can initialize
the dma_mask pointer in struct device and initialize both masks to
32-bits by default, replacing similar functionality in m68k and
powerpc.  The arch_setup_pdev_archdata hooks is now unused and removed.

Note that the code looks a little odd with the various conditionals
because we have to support platform_device structures that are
statically allocated.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20190816062435.881-7-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2019-08-16 08:24:35 +02:00 • committed by Greg Kroah-Hartman
parent bd5defaee8
commit cdfee56232
9 changed files with 17 additions and 44 deletions
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6
arch/powerpc/kernel/setup-common.c
View file

@ -778,12 +778,6 @@ void ppc_printk_progress(char *s, unsigned short hex)
pr_info("%s\n", s);
}
void arch_setup_pdev_archdata(struct platform_device *pdev)
{
pdev->archdata.dma_mask = DMA_BIT_MASK(32);
pdev->dev.dma_mask = &pdev->archdata.dma_mask;
}
static __init void print_system_info(void)
{
pr_info("-----------------------------------------------------\n");