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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-01-29 14:55:21 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-02-02 17:37:41 +0000
commit97f1040982d7935716e9a45a26ccd5cc8fe92f8c (patch)
tree158cd337307a4a4e09a3fb5110f29ab0136bef6c /lib/lzo
parent3c424f359898aff48c3d5bed608ac706f8a528c3 (diff)
downloadop-kernel-dev-97f1040982d7935716e9a45a26ccd5cc8fe92f8c.zip
op-kernel-dev-97f1040982d7935716e9a45a26ccd5cc8fe92f8c.tar.gz
Revert "ARM: 7304/1: ioremap: fix boundary check when reusing static mapping"
This reverts commit 3c424f359898aff48c3d5bed608ac706f8a528c3. Joachim Eastwood reports: | "ARM: 7304/1: ioremap: fix boundary check when reusing static mapping" | Commit: 3c424f359898aff48c3d5bed608ac706f8a528c3 in Linus master | | Breaks booting on my custom AT91RM9200 board. | There isn't any error messages or anything that indicates what goes | wrong it just stops after; Uncompressing Linux... done, booting the | kernel. | | Reverting it makes my board boot again. and further debugging reveals: ioremap: pfn=fffff phys=fffff000 offset=400 size=1000 ioremap: area c3ffdfc0: phys_addr=200000 pfn=200 size=4000 ioremap: found: addr fef74000 => fed73000 => fed73400 Clearly, an area for pfn 0x200, 16K can't ever satisfy a request for pfn 0xfffff. This happens because the changed if statement becomes: if (0x00200 > 0xfffff || 0xfffff000 + 0x400 + 0x1000-1 > 0x00200000 + 0x4000-1) and therefore: if (0x00200 > 0xfffff || 0x000003ff > 0x00203fff) The if condition fails, and so we _believe_ that the SRAM mapping fits our request. Clearly that's totally bogus. Moreover, the original premise of the 'fix' patch was wrong: | The condition checking boundaries of the requested and existing | mappings didn't take in-page offset into consideration though, | which lead to obscure and hard to debug problems when requested | mapping crossed end of the static one. as the code immediately above this loop does: size = PAGE_ALIGN(offset + size); so 'size' already contains the requested offset into the page. So, revert the broken 'fix'. Acked-by: Nicolas Pitre <nico@linaro.org>
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