From: Thor Thayer Date: Wed, 19 Oct 2016 19:53:47 +0000 (-0500) Subject: EDAC, altera: Disable IRQs while injecting SDRAM errors X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=90e493d7d51c791a2adc2de962cbd5000f1b7460;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git EDAC, altera: Disable IRQs while injecting SDRAM errors Disable IRQs while injecting SDRAM errors. The RT patches exposed a spinlock deadlock where the spinlock taken for the regmap write deadlocked with the IRQ clear regmap write. Error injection is not normally enabled for ECC but only for testing. Signed-off-by: Thor Thayer Cc: linux-edac Link: http://lkml.kernel.org/r/1476906827-9412-1-git-send-email-tthayer@opensource.altera.com Signed-off-by: Borislav Petkov --- diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 58d3e2b39b5b..6421cc3c7dc1 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -153,13 +153,17 @@ static ssize_t altr_sdr_mc_err_inject_write(struct file *file, if (count == 3) { edac_printk(KERN_ALERT, EDAC_MC, "Inject Double bit error\n"); + local_irq_disable(); regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, (read_reg | priv->ue_set_mask)); + local_irq_enable(); } else { edac_printk(KERN_ALERT, EDAC_MC, "Inject Single bit error\n"); + local_irq_disable(); regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, (read_reg | priv->ce_set_mask)); + local_irq_enable(); } ptemp[0] = 0x5A5A5A5A;