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a1ed64efc5
This fixes a race condition where the channel resources could be freed before the ISR had finished running resulting in a NULL pointer reference from the ISR. [ 167.148934] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 167.157051] pgd = ffff80003c641000 [ 167.160449] [00000000] *pgd=000000007c507003, *pud=000000007c4ff003, *pmd=0000000000000000 [ 167.168719] Internal error: Oops: 96000046 [#1] PREEMPT SMP [ 167.174289] Modules linked in: [ 167.177348] CPU: 3 PID: 10547 Comm: dma_ioctl Not tainted 4.11.0-rc1-00001-g8d92afddc2f6633a #73 [ 167.186131] Hardware name: Renesas Salvator-X board based on r8a7795 (DT) [ 167.192917] task: ffff80003a411a00 task.stack: ffff80003bcd4000 [ 167.198850] PC is at rcar_dmac_chan_prep_sg+0xe0/0x400 [ 167.203985] LR is at rcar_dmac_chan_prep_sg+0x48/0x400 Based of previous work by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Vinod Koul <vinod.koul@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.