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| author | Fabio Estevam <festevam@gmail.com> | 2013-07-23 18:13:06 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-07-26 15:02:09 +0400 |
| commit | 1f49856bb029779d8f1b63517a3a3b34ffe672c7 (patch) | |
| tree | 2fa00a1dc1f50c04c7c3fd339f534275e213590b /Documentation/scsi/ppa.txt | |
| parent | 8fbac214e5c594a0c2fe78c14adf2cdbb1febc92 (diff) | |
| download | linux-1f49856bb029779d8f1b63517a3a3b34ffe672c7.tar.xz | |
ARM: 7789/1: Do not run dummy_flush_tlb_a15_erratum() on non-Cortex-A15
Commit 93dc688 (ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181 (TLBI/DSB operations)) causes the following undefined instruction error on a mx53 (Cortex-A8):
Internal error: Oops - undefined instruction: 0 [#1] SMP ARM
CPU: 0 PID: 275 Comm: modprobe Not tainted 3.11.0-rc2-next-20130722-00009-g9b0f371 #881
task: df46cc00 ti: df48e000 task.ti: df48e000
PC is at check_and_switch_context+0x17c/0x4d0
LR is at check_and_switch_context+0xdc/0x4d0
This problem happens because check_and_switch_context() calls dummy_flush_tlb_a15_erratum() without checking if we are really running on a Cortex-A15 or not.
To avoid this issue, only call dummy_flush_tlb_a15_erratum() inside
check_and_switch_context() if erratum_a15_798181() returns true, which means that we are really running on a Cortex-A15.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'Documentation/scsi/ppa.txt')
0 files changed, 0 insertions, 0 deletions