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SubjectRe: [PATCHv2] mtd: spi-nor: Fix Cadence QSPI page fault kernel panic
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On Fri, 2018-11-16 at 14:25:49 UTC, thor.thayer@linux.intel.com wrote:
> From: Thor Thayer <thor.thayer@linux.intel.com>
>
> The current Cadence QSPI driver caused a kernel panic sporadically
> when writing to QSPI. The problem was caused by writing more bytes
> than needed because the QSPI operated on 4 bytes at a time.
> <snip>
> [ 11.202044] Unable to handle kernel paging request at virtual address bffd3000
> [ 11.209254] pgd = e463054d
> [ 11.211948] [bffd3000] *pgd=2fffb811, *pte=00000000, *ppte=00000000
> [ 11.218202] Internal error: Oops: 7 [#1] SMP ARM
> [ 11.222797] Modules linked in:
> [ 11.225844] CPU: 1 PID: 1317 Comm: systemd-hwdb Not tainted 4.17.7-d0c45cd44a8f
> [ 11.235796] Hardware name: Altera SOCFPGA Arria10
> [ 11.240487] PC is at __raw_writesl+0x70/0xd4
> [ 11.244741] LR is at cqspi_write+0x1a0/0x2cc
> </snip>
> On a page boundary limit the number of bytes copied from the tx buffer
> to remain within the page.
>
> This patch uses a temporary buffer to hold the 4 bytes to write and then
> copies only the bytes required from the tx buffer.
>
> Reported-by: Adrian Amborzewicz <adrian.ambrozewicz@intel.com>
> Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>

Applied to http://git.infradead.org/linux-mtd.git master, thanks.

Boris

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