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[ Upstream commit8fc5133d6d] On some arch (ie aarch64 iMX8MM) unaligned PCIe accesses are not allowed and lead to a kernel Oops. [ 1911.668835] Unable to handle kernel paging request at virtual address ffff80001bc00a8c [ 1911.668841] Mem abort info: [ 1911.668844] ESR = 0x96000061 [ 1911.668847] EC = 0x25: DABT (current EL), IL = 32 bits [ 1911.668850] SET = 0, FnV = 0 [ 1911.668852] EA = 0, S1PTW = 0 [ 1911.668853] Data abort info: [ 1911.668855] ISV = 0, ISS = 0x00000061 [ 1911.668857] CM = 0, WnR = 1 [ 1911.668861] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000040ff4000 [ 1911.668864] [ffff80001bc00a8c] pgd=00000000bffff003, pud=00000000bfffe003, pmd=0068000018400705 [ 1911.668872] Internal error: Oops: 96000061 [#1] PREEMPT SMP ... The llp register present in the channel group registers is not aligned on 64bit. Fix unaligned 64bit access using two 32bit accesses Fixes:04e0a39fc1("dmaengine: dw-edma: Add writeq() and readq() for 64 bits architectures") Signed-off-by: Herve Codina <herve.codina@bootlin.com> Link: https://lore.kernel.org/r/20220225120252.309404-1-herve.codina@bootlin.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.