From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> In preparation for additional memory module ECCs, the IRQ function will check a panic flag before doing a kernel panic on double bit errors. OCRAM uncorrectable errors cause a panic because sleep/resume functions and FPGA contents during sleep are stored in OCRAM. ECCs on peripheral FIFO buffers will not cause a kernel panic on DBERRs because the packet can be retried and therefore recovered. Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> --- v2 New patch. Add panic flag to IRQ function. v3 No change v4 Add reasons to panic on DBERR in OCRAM. --- drivers/edac/altera_edac.c | 9 ++++++++- drivers/edac/altera_edac.h | 1 + 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 926bcaf..ced7c55 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -897,7 +897,8 @@ static irqreturn_t altr_edac_a10_ecc_irq(int irq, void *dev_id) writel(ALTR_A10_ECC_DERRPENA, base + ALTR_A10_ECC_INTSTAT_OFST); edac_device_handle_ue(dci->edac_dev, 0, 0, dci->edac_dev_name); - panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n"); + if (dci->data->panic) + panic("\nEDAC:ECC_DEVICE[Uncorrectable errors]\n"); return IRQ_HANDLED; } @@ -936,6 +937,12 @@ const struct edac_device_prv_data a10_ocramecc_data = { .set_err_ofst = ALTR_A10_ECC_INTTEST_OFST, .ecc_irq_handler = altr_edac_a10_ecc_irq, .inject_fops = &altr_edac_a10_device_inject_fops, + /* + * OCRAM panic on uncorrectable error because sleep/resume + * functions and FPGA contents are stored in OCRAM. Prefer + * a kernel panic over executing/loading corrupted data. + */ + .panic = true, }; #endif /* CONFIG_EDAC_ALTERA_OCRAM */ diff --git a/drivers/edac/altera_edac.h b/drivers/edac/altera_edac.h index 62b0fa0..cf4e8cb 100644 --- a/drivers/edac/altera_edac.h +++ b/drivers/edac/altera_edac.h @@ -298,6 +298,7 @@ struct edac_device_prv_data { irqreturn_t (*ecc_irq_handler)(int irq, void *dev_id); int trig_alloc_sz; const struct file_operations *inject_fops; + bool panic; }; struct altr_edac_device_dev { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html